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game/server/NextBot/Behavior/BehaviorBackUp.h

@@ -0,0 +1,118 @@
+// BehaviorBackUp.h
+// Back up for a short duration
+// Author: Michael Booth, March 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _BEHAVIOR_BACK_UP_H_
+#define _BEHAVIOR_BACK_UP_H_
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Move backwards for a short duration away from a given position.  
+ * Useful to dislodge ourselves if we get stuck while following our path.
+ */
+template < typename Actor >
+class BehaviorBackUp : public Action< Actor >
+{
+public:
+	BehaviorBackUp( const Vector &avoidPos );
+
+	virtual ActionResult< Actor > OnStart( Actor *me, Action< Actor > *priorAction );
+	virtual ActionResult< Actor > Update( Actor *me, float interval );
+
+	virtual EventDesiredResult< Actor > OnStuck( Actor *me );
+
+	virtual const char *GetName( void ) const	{ return "BehaviorBackUp"; }
+
+private:
+	CountdownTimer m_giveUpTimer;
+	CountdownTimer m_backupTimer;
+	CountdownTimer m_jumpTimer;
+	Vector m_way;
+	Vector m_avoidPos;
+};
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor >
+inline BehaviorBackUp< Actor >::BehaviorBackUp( const Vector &avoidPos )
+{
+	m_avoidPos = avoidPos;
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor >
+inline ActionResult< Actor > BehaviorBackUp< Actor >::OnStart( Actor *me, Action< Actor > *priorAction )
+{
+	ILocomotion *mover = me->GetLocomotionInterface();
+
+	// don't back off if we're on a ladder
+	if ( mover && mover->IsUsingLadder() )
+	{
+		return Done();
+	}
+	
+	float backupTime = RandomFloat( 0.3f, 0.5f );
+	
+	m_backupTimer.Start( backupTime );
+	m_jumpTimer.Start( 1.5f * backupTime );
+	m_giveUpTimer.Start( 2.5f * backupTime );
+	
+	m_way = me->GetPosition() - m_avoidPos;
+	m_way.NormalizeInPlace();
+	
+	return Continue();
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor >
+inline ActionResult< Actor > BehaviorBackUp< Actor >::Update( Actor *me, float interval )
+{
+	if ( m_giveUpTimer.IsElapsed() )
+	{
+		return Done();
+	}
+
+// 	if ( m_jumpTimer.HasStarted() && m_jumpTimer.IsElapsed() )
+// 	{
+// 		me->GetLocomotionInterface()->Jump();
+// 		m_jumpTimer.Invalidate();
+// 	}
+
+	ILocomotion *mover = me->GetLocomotionInterface();
+	if ( mover )
+	{
+		Vector goal;
+
+		if ( m_backupTimer.IsElapsed() )
+		{
+			// move towards bad spot
+			goal = m_avoidPos; // me->GetPosition() - 100.0f * m_way;
+		}
+		else
+		{
+			// move away from bad spot
+			goal = me->GetPosition() + 100.0f * m_way;
+		}
+
+		mover->Approach( goal );
+	}
+	
+	return Continue();
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor >
+inline EventDesiredResult< Actor > BehaviorBackUp< Actor >::OnStuck( Actor *me )
+{
+	return TryToSustain( RESULT_IMPORTANT, "Stuck while trying to back up" );
+}
+
+
+
+#endif // _BEHAVIOR_BACK_UP_H_
+

game/server/NextBot/Behavior/BehaviorMoveTo.h

@@ -0,0 +1,126 @@
+// BehaviorMoveTo.h
+// Move to a potentially far away position
+// Author: Michael Booth, June 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _BEHAVIOR_MOVE_TO_H_
+#define _BEHAVIOR_MOVE_TO_H_
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Move to a potentially far away position, using path planning.
+ */
+template < typename Actor, typename PathCost >
+class BehaviorMoveTo : public Action< Actor >
+{
+public:
+	BehaviorMoveTo( const Vector &goal, Action< Actor > *successAction = NULL, Action< Actor > *failAction = NULL );
+
+	virtual ActionResult< Actor > OnStart( Actor *me, Action< Actor > *priorAction );
+	virtual ActionResult< Actor > Update( Actor *me, float interval );
+
+	virtual EventDesiredResult< Actor > OnMoveToSuccess( Actor *me, const Path *path );
+	virtual EventDesiredResult< Actor > OnMoveToFailure( Actor *me, const Path *path, MoveToFailureType reason );
+
+	virtual bool ComputePath( Actor *me, const Vector &goal, PathFollower *path );
+
+	virtual const char *GetName( void ) const	{ return "BehaviorMoveTo"; }
+
+private:
+	Vector m_goal;
+	PathFollower m_path;
+	Action< Actor > *m_successAction;
+	Action< Actor > *m_failAction;
+};
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor, typename PathCost >
+inline BehaviorMoveTo< Actor, PathCost >::BehaviorMoveTo( const Vector &goal, Action< Actor > *successAction, Action< Actor > *failAction )
+{
+	m_goal = goal;
+	m_path.Invalidate();
+	m_successAction = successAction;
+	m_failAction = failAction;
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor, typename PathCost >
+inline bool BehaviorMoveTo< Actor, PathCost >::ComputePath( Actor *me, const Vector &goal, PathFollower *path )
+{
+	PathCost cost( me );
+	return path->Compute( me, goal, cost );
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor, typename PathCost >
+inline ActionResult< Actor > BehaviorMoveTo< Actor, PathCost >::OnStart( Actor *me, Action< Actor > *priorAction )
+{
+	if ( !this->ComputePath( me, m_goal, &m_path ) )
+	{
+		if ( m_failAction )
+		{
+			return this->ChangeTo( m_failAction, "No path to goal" );
+		}
+
+		return this->Done( "No path to goal" );
+	}
+
+	return this->Continue();
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor, typename PathCost >
+inline ActionResult< Actor > BehaviorMoveTo< Actor, PathCost >::Update( Actor *me, float interval )
+{
+	// if path became invalid during last tick for any reason, we're done
+	if ( !m_path.IsValid() )
+	{
+		if ( m_failAction )
+		{
+			return this->ChangeTo( m_failAction, "Path is invalid" );
+		}
+
+		return this->Done( "Path is invalid" );
+	}
+
+	// move along path - success/fail event handlers will exit behavior when goal is reached
+	m_path.Update( me );
+
+	return this->Continue();
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor, typename PathCost >
+inline EventDesiredResult< Actor > BehaviorMoveTo< Actor, PathCost >::OnMoveToSuccess( Actor *me, const Path *path )
+{
+	if ( m_successAction )
+	{
+		return this->TryChangeTo( m_successAction, RESULT_CRITICAL, "OnMoveToSuccess" );
+	}
+
+	return this->TryDone( RESULT_CRITICAL, "OnMoveToSuccess" );
+}
+
+
+//----------------------------------------------------------------------------------------------
+template < typename Actor, typename PathCost >
+inline EventDesiredResult< Actor > BehaviorMoveTo< Actor, PathCost >::OnMoveToFailure( Actor *me, const Path *path, MoveToFailureType reason )
+{
+	if ( m_failAction )
+	{
+		return this->TryChangeTo( m_failAction, RESULT_CRITICAL, "OnMoveToFailure" );
+	}
+
+	return this->TryDone( RESULT_CRITICAL, "OnMoveToFailure" );
+}
+
+
+
+#endif // _BEHAVIOR_MOVE_TO_H_
+

game/server/NextBot/NavMeshEntities/func_nav_prerequisite.cpp

@@ -0,0 +1,75 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+// NextBot paths that go through this entity must fulfill the given prerequisites to pass
+// Michael Booth, August 2009
+
+#include "cbase.h"
+#include "func_nav_prerequisite.h"
+#include "ndebugoverlay.h"
+#include "modelentities.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+LINK_ENTITY_TO_CLASS( func_nav_prerequisite, CFuncNavPrerequisite );
+
+BEGIN_DATADESC( CFuncNavPrerequisite )
+	DEFINE_KEYFIELD( m_task,			FIELD_INTEGER,	"Task" ),
+	DEFINE_KEYFIELD( m_taskEntityName,	FIELD_STRING,	"Entity" ),
+	DEFINE_KEYFIELD( m_taskValue,		FIELD_FLOAT,	"Value" ),
+	DEFINE_KEYFIELD( m_isDisabled,		FIELD_BOOLEAN,	"StartDisabled" ),
+	DEFINE_INPUTFUNC( FIELD_VOID, "Enable", InputEnable ),
+	DEFINE_INPUTFUNC( FIELD_VOID, "Disable", InputDisable ),
+END_DATADESC()
+
+IMPLEMENT_AUTO_LIST( IFuncNavPrerequisiteAutoList );
+
+
+//-----------------------------------------------------------------------------
+CFuncNavPrerequisite::CFuncNavPrerequisite()
+{
+	m_task = TASK_NONE;
+	m_hTaskEntity = NULL;
+}
+
+
+//-----------------------------------------------------------------------------
+void CFuncNavPrerequisite::Spawn( void )
+{
+	AddSpawnFlags( SF_TRIGGER_ALLOW_CLIENTS );
+
+	BaseClass::Spawn();
+	InitTrigger();
+}
+
+
+//-----------------------------------------------------------------------------
+bool CFuncNavPrerequisite::IsTask( TaskType task ) const
+{
+	return task == m_task ? true : false;
+}
+
+
+//-----------------------------------------------------------------------------
+CBaseEntity *CFuncNavPrerequisite::GetTaskEntity( void )
+{
+	if ( m_hTaskEntity == NULL )
+	{
+		m_hTaskEntity = gEntList.FindEntityByName( NULL, m_taskEntityName );
+	}
+	return m_hTaskEntity;
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+void CFuncNavPrerequisite::InputEnable( inputdata_t &inputdata )
+{
+	m_isDisabled = false;
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+void CFuncNavPrerequisite::InputDisable( inputdata_t &inputdata )
+{
+	m_isDisabled = true;
+}

game/server/NextBot/NavMeshEntities/func_nav_prerequisite.h

@@ -0,0 +1,56 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+// NextBot paths that go through this entity must fulfill the given prerequisites to pass
+// Michael Booth, August 2009
+
+#ifndef FUNC_NAV_PREREQUISITE_H
+#define FUNC_NAV_PREREQUISITE_H
+
+#include "triggers.h"
+
+/**
+ * NextBot paths that pass through this entity must fulfill the given prerequisites to pass
+ */
+DECLARE_AUTO_LIST( IFuncNavPrerequisiteAutoList );
+
+class CFuncNavPrerequisite : public CBaseTrigger, public IFuncNavPrerequisiteAutoList
+{
+	DECLARE_CLASS( CFuncNavPrerequisite, CBaseTrigger );
+
+public:
+	CFuncNavPrerequisite();
+
+	DECLARE_DATADESC();
+
+	virtual void Spawn( void );
+
+	enum TaskType
+	{
+		TASK_NONE = 0,
+		TASK_DESTROY_ENTITY = 1,
+		TASK_MOVE_TO_ENTITY = 2,
+		TASK_WAIT			= 3,
+	};
+
+	bool IsTask( TaskType type ) const;
+	CBaseEntity *GetTaskEntity( void );
+	float GetTaskValue( void ) const;
+
+	void InputEnable( inputdata_t &inputdata );
+	void InputDisable( inputdata_t &inputdata );
+	bool IsEnabled( void ) const { return !m_isDisabled; }
+
+protected:
+	int m_task;
+	string_t m_taskEntityName;
+	float m_taskValue;
+	bool m_isDisabled;
+	EHANDLE m_hTaskEntity;
+};
+
+inline float CFuncNavPrerequisite::GetTaskValue( void ) const
+{
+	return m_taskValue;
+}
+
+
+#endif // FUNC_NAV_PREREQUISITE_H

game/server/NextBot/NextBot.cpp

@@ -0,0 +1,523 @@
+// NextBotCombatCharacter.cpp
+// Next generation bot system
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "team.h"
+#include "CRagdollMagnet.h"
+
+#include "NextBot.h"
+#include "NextBotLocomotionInterface.h"
+#include "NextBotBodyInterface.h"
+
+#ifdef TERROR
+#include "TerrorGamerules.h"
+#endif
+
+#include "vprof.h"
+#include "datacache/imdlcache.h"
+#include "EntityFlame.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+ConVar NextBotStop( "nb_stop", "0", FCVAR_CHEAT | FCVAR_REPLICATED, "Stop all NextBots" );
+
+
+//--------------------------------------------------------------------------------------------------------
+class CSendBotCommand
+{
+public:
+	CSendBotCommand( const char *command )
+	{
+		m_command = command;
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		bot->OnCommandString( m_command );
+		return true;
+	}
+
+	const char *m_command;
+};
+
+
+CON_COMMAND_F( nb_command, "Sends a command string to all bots", FCVAR_CHEAT )
+{
+	if ( args.ArgC() <= 1 )
+	{
+		Msg( "Missing command string" );
+		return;
+	}
+
+	CSendBotCommand sendCmd( args.ArgS() );
+	TheNextBots().ForEachBot( sendCmd );
+}
+
+
+
+//-----------------------------------------------------------------------------------------------------
+BEGIN_DATADESC( NextBotCombatCharacter )
+
+	DEFINE_THINKFUNC( DoThink ),
+
+END_DATADESC()
+
+
+//-----------------------------------------------------------------------------------------------------
+IMPLEMENT_SERVERCLASS_ST( NextBotCombatCharacter, DT_NextBot )
+END_SEND_TABLE()
+
+
+//-----------------------------------------------------------------------------------------------------
+NextBotDestroyer::NextBotDestroyer( int team )
+{
+	m_team = team;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+bool NextBotDestroyer::operator() ( INextBot *bot  )
+{
+	if ( m_team == TEAM_ANY || bot->GetEntity()->GetTeamNumber() == m_team )
+	{
+		// players need to be kicked, not deleted
+		if ( bot->GetEntity()->IsPlayer() )
+		{
+			CBasePlayer *player = dynamic_cast< CBasePlayer * >( bot->GetEntity() );
+			engine->ServerCommand( UTIL_VarArgs( "kickid %d\n", player->GetUserID() ) );
+		}
+		else
+		{
+			UTIL_Remove( bot->GetEntity() );
+		}
+	}
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+CON_COMMAND_F( nb_delete_all, "Delete all non-player NextBot entities.", FCVAR_CHEAT )
+{
+	// Listenserver host or rcon access only!
+	if ( !UTIL_IsCommandIssuedByServerAdmin() )
+		return;
+
+	CTeam *team = NULL;
+
+	if ( args.ArgC() == 2 )
+	{
+		const char *teamName = args[1];
+
+		for( int i=0; i < g_Teams.Count(); ++i )
+		{
+			if ( FStrEq( teamName, g_Teams[i]->GetName() ) )
+			{
+				// delete all bots on this team
+				team = g_Teams[i];
+				break;
+			}
+		}
+
+		if ( team == NULL )
+		{
+			Msg( "Invalid team '%s'\n", teamName );
+			return;
+		}
+	}
+
+	// delete all bots on all teams
+	NextBotDestroyer destroyer( team ? team->GetTeamNumber() : TEAM_ANY );
+	TheNextBots().ForEachBot( destroyer );
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+class NextBotApproacher
+{
+public:
+	NextBotApproacher( void )
+	{
+		CBasePlayer *player = UTIL_GetListenServerHost();
+		if ( player )
+		{
+			Vector forward;
+			player->EyeVectors( &forward );
+
+			trace_t result;
+			unsigned int mask = MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE | CONTENTS_GRATE | CONTENTS_WINDOW;
+			UTIL_TraceLine( player->EyePosition(), player->EyePosition() + 999999.9f * forward, mask, player, COLLISION_GROUP_NONE, &result );
+			if ( result.DidHit() )
+			{
+				NDebugOverlay::Cross3D( result.endpos, 5, 0, 255, 0, true, 10.0f );
+				m_isGoalValid = true;
+				m_goal = result.endpos;
+			}
+			else
+			{
+				m_isGoalValid = false;
+			}
+		}
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		if ( TheNextBots().IsDebugFilterMatch( bot ) )
+		{
+			bot->OnCommandApproach( m_goal );
+		}
+		return true;
+	}
+
+	bool m_isGoalValid;
+	Vector m_goal;
+};
+
+CON_COMMAND_F( nb_move_to_cursor, "Tell all NextBots to move to the cursor position", FCVAR_CHEAT )
+{
+	// Listenserver host or rcon access only!
+	if ( !UTIL_IsCommandIssuedByServerAdmin() )
+		return;
+
+	NextBotApproacher approach;
+	TheNextBots().ForEachBot( approach );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+//----------------------------------------------------------------------------------------------------------
+bool IgnoreActorsTraceFilterFunction( IHandleEntity *pServerEntity, int contentsMask )
+{
+	CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+	return ( entity->MyCombatCharacterPointer() == NULL );	// includes all bots, npcs, players, and TF2 buildings
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+//----------------------------------------------------------------------------------------------------------
+bool VisionTraceFilterFunction( IHandleEntity *pServerEntity, int contentsMask )
+{
+	// Honor BlockLOS also to allow seeing through partially-broken doors
+	CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+	return ( entity->MyCombatCharacterPointer() == NULL && entity->BlocksLOS() );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+//----------------------------------------------------------------------------------------------------------
+
+NextBotCombatCharacter::NextBotCombatCharacter( void )
+
+{
+	m_lastAttacker = NULL;
+	m_didModelChange = false;
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::Spawn( void )
+{
+	BaseClass::Spawn();
+	
+	// reset bot components
+	Reset();
+
+	SetSolid( SOLID_BBOX );
+	AddSolidFlags( FSOLID_NOT_STANDABLE );
+	
+	SetMoveType( MOVETYPE_CUSTOM );	
+	
+	SetCollisionGroup( COLLISION_GROUP_PLAYER );
+
+	m_iMaxHealth = m_iHealth;
+	m_takedamage = DAMAGE_YES;
+
+	MDLCACHE_CRITICAL_SECTION();
+	InitBoneControllers( ); 
+
+	// set up think callback
+	SetThink( &NextBotCombatCharacter::DoThink );
+	SetNextThink( gpGlobals->curtime );
+
+	m_lastAttacker = NULL;
+}
+
+
+bool NextBotCombatCharacter::IsAreaTraversable( const CNavArea *area ) const
+{
+	if ( !area )
+		return false;
+	ILocomotion *mover = GetLocomotionInterface();
+	if ( mover && !mover->IsAreaTraversable( area ) )
+		return false;
+	return BaseClass::IsAreaTraversable( area );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::DoThink( void )
+{
+	VPROF_BUDGET( "NextBotCombatCharacter::DoThink", "NextBot" );
+
+	SetNextThink( gpGlobals->curtime );
+
+	if ( BeginUpdate() )
+	{
+		// emit model change event	
+		if ( m_didModelChange )
+		{
+			m_didModelChange = false;
+
+			OnModelChanged();
+
+			// propagate model change into NextBot event responders
+			for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+			{
+				sub->OnModelChanged();
+			}	
+		}
+
+		UpdateLastKnownArea();	
+
+		// update bot components
+		if ( !NextBotStop.GetBool() && (GetFlags() & FL_FROZEN) == 0 )
+		{
+			Update();
+		}
+
+		EndUpdate();
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::Touch( CBaseEntity *other )
+{
+	if ( ShouldTouch( other ) )
+	{
+		// propagate touch into NextBot event responders
+		trace_t result;
+		result = GetTouchTrace();
+
+		// OnContact refers to *physical* contact, not triggers or other non-physical entities
+		if ( result.DidHit() || other->MyCombatCharacterPointer() != NULL )
+		{
+			OnContact( other, &result );
+		}
+	}
+	
+	BaseClass::Touch( other );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::SetModel( const char *szModelName )
+{
+	// actually change the model
+	BaseClass::SetModel( szModelName );
+	
+	// need to do a lazy-check because precache system also invokes this
+	m_didModelChange = true;
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::Ignite( float flFlameLifetime, bool bNPCOnly, float flSize, bool bCalledByLevelDesigner )
+{
+	BaseClass::Ignite( flFlameLifetime, bNPCOnly, flSize, bCalledByLevelDesigner );
+	
+	// propagate event to components
+	OnIgnite();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::Ignite( float flFlameLifetime, CBaseEntity *pAttacker )
+{
+	if ( IsOnFire() )
+		return;
+
+	// BaseClass::Ignite stuff, plus SetAttacker on the flame, so our attacker gets credit
+	CEntityFlame *pFlame = CEntityFlame::Create( this );
+	if ( pFlame )
+	{
+		pFlame->SetLifetime( flFlameLifetime );
+		AddFlag( FL_ONFIRE );
+
+		SetEffectEntity( pFlame );
+	}
+	m_OnIgnite.FireOutput( this, this );
+
+	// propagate event to components
+	OnIgnite();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+int NextBotCombatCharacter::OnTakeDamage_Alive( const CTakeDamageInfo &info )
+{
+	// track our last attacker
+	if ( info.GetAttacker() && info.GetAttacker()->MyCombatCharacterPointer() )
+	{
+		m_lastAttacker = info.GetAttacker()->MyCombatCharacterPointer();
+	}
+
+	// propagate event to components
+	OnInjured( info );
+	
+	return CBaseCombatCharacter::OnTakeDamage_Alive( info );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+int NextBotCombatCharacter::OnTakeDamage_Dying( const CTakeDamageInfo &info )
+{
+	// track our last attacker	
+	if ( info.GetAttacker()->MyCombatCharacterPointer() )
+	{
+		m_lastAttacker = info.GetAttacker()->MyCombatCharacterPointer();
+	}
+
+	// propagate event to components
+	OnInjured( info );
+
+	return CBaseCombatCharacter::OnTakeDamage_Dying( info );
+}
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Can't use CBaseCombatCharacter's Event_Killed because it will immediately ragdoll us
+ */
+static int g_DeathStartEvent = 0;
+void NextBotCombatCharacter::Event_Killed( const CTakeDamageInfo &info )
+{
+	// track our last attacker
+	if ( info.GetAttacker() && info.GetAttacker()->MyCombatCharacterPointer() )
+	{
+		m_lastAttacker = info.GetAttacker()->MyCombatCharacterPointer();
+	}
+
+	// propagate event to my components
+	OnKilled( info );
+	
+	// Advance life state to dying
+	m_lifeState = LIFE_DYING;
+
+#ifdef TERROR
+	/*
+	 * TODO: Make this game-generic
+	 */
+	// Create the death event just like players do.
+	TerrorGameRules()->DeathNoticeForEntity( this, info );
+
+	// Infected specific event
+	TerrorGameRules()->DeathNoticeForInfected( this, info );
+#endif
+
+	if ( GetOwnerEntity() != NULL )
+	{
+		GetOwnerEntity()->DeathNotice( this );
+	}
+
+	// inform the other bots
+	TheNextBots().OnKilled( this, info );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::PerformCustomPhysics( Vector *pNewPosition, Vector *pNewVelocity, QAngle *pNewAngles, QAngle *pNewAngVelocity )
+{
+	ILocomotion *mover = GetLocomotionInterface();
+	if ( mover )
+	{
+		// hack to keep ground entity from being NULL'd when Z velocity is positive
+		SetGroundEntity( mover->GetGround() );
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+bool NextBotCombatCharacter::BecomeRagdoll( const CTakeDamageInfo &info, const Vector &forceVector )
+{
+	// See if there's a ragdoll magnet that should influence our force.
+	Vector adjustedForceVector = forceVector;
+	CRagdollMagnet *magnet = CRagdollMagnet::FindBestMagnet( this );
+	if ( magnet )
+	{
+		adjustedForceVector += magnet->GetForceVector( this );
+	}
+
+	// clear the deceased's sound channels.(may have been firing or reloading when killed)
+	EmitSound( "BaseCombatCharacter.StopWeaponSounds" );
+
+	return BaseClass::BecomeRagdoll( info, adjustedForceVector );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::HandleAnimEvent( animevent_t *event )
+{
+	// propagate event to components
+	OnAnimationEvent( event );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Propagate event into NextBot event responders
+ */
+void NextBotCombatCharacter::OnNavAreaChanged( CNavArea *enteredArea, CNavArea *leftArea )
+{
+	INextBotEventResponder::OnNavAreaChanged( enteredArea, leftArea );
+
+	BaseClass::OnNavAreaChanged( enteredArea, leftArea );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+Vector NextBotCombatCharacter::EyePosition( void )
+{
+	if ( GetBodyInterface() )
+	{
+		return GetBodyInterface()->GetEyePosition();
+	}
+
+	return BaseClass::EyePosition();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Return true if this object can be +used by the bot
+ */
+bool NextBotCombatCharacter::IsUseableEntity( CBaseEntity *entity, unsigned int requiredCaps )
+{
+	if ( entity )
+	{
+		int caps = entity->ObjectCaps();
+		if ( caps & (FCAP_IMPULSE_USE|FCAP_CONTINUOUS_USE|FCAP_ONOFF_USE|FCAP_DIRECTIONAL_USE) )
+		{
+			if ( (caps & requiredCaps) == requiredCaps )
+			{
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void NextBotCombatCharacter::UseEntity( CBaseEntity *entity, USE_TYPE useType )
+{
+	if ( IsUseableEntity( entity ) )
+	{
+		variant_t emptyVariant;
+		entity->AcceptInput( "Use", this, this, emptyVariant, useType );
+	}
+}

game/server/NextBot/NextBot.h

@@ -0,0 +1,104 @@
+// NextBotCombatCharacter.h
+// Next generation bot system
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_H_
+#define _NEXT_BOT_H_
+
+#include "NextBotInterface.h"
+#include "NextBotManager.h"
+
+#ifdef TERROR
+#include "player_lagcompensation.h"
+#endif
+
+class NextBotCombatCharacter;
+struct animevent_t;
+
+extern ConVar NextBotStop;
+
+
+//----------------------------------------------------------------------------------------------------------------
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * A Next Bot derived from CBaseCombatCharacter
+ */
+class NextBotCombatCharacter : public CBaseCombatCharacter, public INextBot
+{
+public:
+	DECLARE_CLASS( NextBotCombatCharacter, CBaseCombatCharacter );
+	DECLARE_SERVERCLASS();
+	DECLARE_DATADESC();
+	
+	NextBotCombatCharacter( void );
+	virtual ~NextBotCombatCharacter() { }
+
+	virtual void Spawn( void );
+
+	virtual Vector EyePosition( void );
+
+	virtual INextBot *MyNextBotPointer( void ) { return this; }
+
+	// Event hooks into NextBot system ---------------------------------------
+	virtual int OnTakeDamage_Alive( const CTakeDamageInfo &info );
+	virtual int OnTakeDamage_Dying( const CTakeDamageInfo &info );
+	virtual void Event_Killed( const CTakeDamageInfo &info );
+	virtual void HandleAnimEvent( animevent_t *event );
+	virtual void OnNavAreaChanged( CNavArea *enteredArea, CNavArea *leftArea );	// invoked (by UpdateLastKnownArea) when we enter a new nav area (or it is reset to NULL)
+	virtual void Touch( CBaseEntity *other );
+	virtual void SetModel( const char *szModelName );
+	virtual void Ignite( float flFlameLifetime, bool bNPCOnly = true, float flSize = 0.0f, bool bCalledByLevelDesigner = false );
+	virtual void Ignite( float flFlameLifetime, CBaseEntity *pAttacker );
+	//------------------------------------------------------------------------
+
+	virtual bool IsUseableEntity( CBaseEntity *entity, unsigned int requiredCaps = 0 );
+	void UseEntity( CBaseEntity *entity, USE_TYPE useType = USE_TOGGLE );
+
+	// Implement this if you use MOVETYPE_CUSTOM
+	virtual void PerformCustomPhysics( Vector *pNewPosition, Vector *pNewVelocity, QAngle *pNewAngles, QAngle *pNewAngVelocity );
+
+	virtual bool BecomeRagdoll( const CTakeDamageInfo &info, const Vector &forceVector );
+	
+	// hook to INextBot update
+	void DoThink( void );
+
+	// expose to public
+	int	GetLastHitGroup( void ) const;								// where on our body were we injured last
+
+	virtual bool IsAreaTraversable( const CNavArea *area ) const;							// return true if we can use the given area 
+
+	virtual CBaseCombatCharacter *GetLastAttacker( void ) const;	// return the character who last attacked me
+
+	// begin INextBot public interface ----------------------------------------------------------------
+	virtual NextBotCombatCharacter *GetEntity( void ) const			{ return const_cast< NextBotCombatCharacter * >( this ); }
+	virtual NextBotCombatCharacter *GetNextBotCombatCharacter( void ) const	{ return const_cast< NextBotCombatCharacter * >( this ); }
+	
+
+private:
+	EHANDLE m_lastAttacker;
+	
+	bool m_didModelChange;
+};
+
+
+inline CBaseCombatCharacter *NextBotCombatCharacter::GetLastAttacker( void ) const
+{
+	return ( m_lastAttacker.Get() == NULL ) ? NULL : m_lastAttacker->MyCombatCharacterPointer();
+}
+
+inline int NextBotCombatCharacter::GetLastHitGroup( void ) const
+{
+	return LastHitGroup();
+}
+
+//-----------------------------------------------------------------------------------------------------
+class NextBotDestroyer
+{
+public:
+	NextBotDestroyer( int team );
+	bool operator() ( INextBot *bot );
+	int m_team;			// the team to delete bots from, or TEAM_ANY for any team
+};
+
+#endif // _NEXT_BOT_H_

game/server/NextBot/NextBotAttentionInterface.cpp

@@ -0,0 +1,162 @@
+// NextBotAttentionInterface.cpp
+// Manage what this bot pays attention to
+// Author: Michael Booth, April 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBot.h"
+#include "NextBotAttentionInterface.h"
+#include "NextBotBodyInterface.h"
+
+#include "tier0/vprof.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Reset to initial state
+ */
+void IAttention::Reset( void )
+{
+	m_body = GetBot()->GetBodyInterface();
+
+	m_attentionSet.RemoveAll();
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Update internal state
+ */
+void IAttention::Update( void )
+{
+}
+
+
+//------------------------------------------------------------------------------------------
+void IAttention::AttendTo( const CBaseCombatCharacter *who, const char *reason )
+{
+	if ( !IsAwareOf( who ) )
+	{
+		PointOfInterest p;
+		p.m_type = PointOfInterest::WHO;
+		p.m_who = who;
+		p.m_duration.Start();
+
+		m_attentionSet.AddToTail( p );
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+void IAttention::AttendTo( const CBaseEntity *what, const char *reason )
+{
+	if ( !IsAwareOf( what ) )
+	{
+		PointOfInterest p;
+		p.m_type = PointOfInterest::WHAT;
+		p.m_what = what;
+		p.m_duration.Start();
+
+		m_attentionSet.AddToTail( p );
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+void IAttention::AttendTo( const Vector &where, IAttention::SignificanceLevel significance, const char *reason )
+{
+	PointOfInterest p;
+	p.m_type = PointOfInterest::WHERE;
+	p.m_where = where;
+	p.m_duration.Start();
+
+	m_attentionSet.AddToTail( p );
+}
+
+
+//------------------------------------------------------------------------------------------
+void IAttention::Disregard( const CBaseCombatCharacter *who, const char *reason )
+{
+	FOR_EACH_VEC( m_attentionSet, it )
+	{
+		if ( m_attentionSet[ it ].m_type == PointOfInterest::WHO )
+		{
+			CBaseCombatCharacter *myWho = m_attentionSet[ it ].m_who;
+
+			if ( !myWho || myWho->entindex() == who->entindex() )
+			{
+				m_attentionSet.Remove( it );
+				return;
+			}
+		}
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+void IAttention::Disregard( const CBaseEntity *what, const char *reason )
+{
+	FOR_EACH_VEC( m_attentionSet, it )
+	{
+		if ( m_attentionSet[ it ].m_type == PointOfInterest::WHAT )
+		{
+			CBaseCombatCharacter *myWhat = m_attentionSet[ it ].m_what;
+
+			if ( !myWhat || myWhat->entindex() == what->entindex() )
+			{
+				m_attentionSet.Remove( it );
+				return;
+			}
+		}
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Return true if given actor is in our attending set
+ */
+bool IAttention::IsAwareOf( const CBaseCombatCharacter *who ) const
+{
+	FOR_EACH_VEC( m_attentionSet, it )
+	{
+		if ( m_attentionSet[ it ].m_type == PointOfInterest::WHO )
+		{
+			CBaseCombatCharacter *myWho = m_attentionSet[ it ].m_who;
+
+			if ( myWho && myWho->entindex() == who->entindex() )
+			{
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Return true if given object is in our attending set
+ */
+bool IAttention::IsAwareOf( const CBaseEntity *what ) const
+{
+	FOR_EACH_VEC( m_attentionSet, it )
+	{
+		if ( m_attentionSet[ it ].m_type == PointOfInterest::WHAT )
+		{
+			CBaseEntity *myWhat = m_attentionSet[ it ].m_what;
+
+			if ( myWhat && myWhat->entindex() == what->entindex() )
+			{
+				return true;
+			}
+		}
+	}
+
+	return false;
+}

game/server/NextBot/NextBotAttentionInterface.h

@@ -0,0 +1,81 @@
+// NextBotAttentionInterface.h
+// Manage what this bot pays attention to
+// Author: Michael Booth, April 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_ATTENTION_INTERFACE_H_
+#define _NEXT_BOT_ATTENTION_INTERFACE_H_
+
+#include "NextBotComponentInterface.h"
+
+class INextBot;
+class IBody;
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for managing what a bot pays attention to.
+ * Vision determines what see see and notice -> Attention determines which of those things we look at -> Low level head/aiming simulation actually moves our head/eyes
+ */
+class IAttention : public INextBotComponent
+{
+public:
+	IAttention( INextBot *bot ) : INextBotComponent( bot ) { }
+	virtual ~IAttention() { }
+
+	virtual void Reset( void )	{ }										// reset to initial state
+	virtual void Update( void ) { }										// update internal state
+
+	enum SignificanceLevel
+	{
+		BORING,					// background noise
+		INTERESTING,			// notably interesting
+		COMPELLING,				// very hard to pay attention to anything else
+		IRRESISTIBLE,			// can't look away
+	};
+
+	// override these to control the significance of entities in a context-specific way
+	virtual int CompareSignificance( const CBaseEntity *a, const CBaseEntity *b ) const;	// returns <0 if a < b, 0 if a==b, or >0 if a>b
+
+	// bring things to our attention
+	virtual void AttendTo( CBaseEntity *what, const char *reason = NULL );
+	virtual void AttendTo( const Vector &where, SignificanceLevel significance, const char *reason = NULL );
+
+	// remove things from our attention
+	virtual void Disregard( CBaseEntity *what, const char *reason = NULL );
+
+	virtual bool IsAwareOf( CBaseEntity *what ) const;								// return true if given object is in our attending set
+	virtual float GetAwareDuration( CBaseEntity *what ) const;						// return how long we've been aware of this entity
+
+	// INextBotEventResponder ------------------------------------------------------------------
+	virtual void OnInjured( const CTakeDamageInfo &info );							// when bot is damaged by something
+	virtual void OnContact( CBaseEntity *other, CGameTrace *result = NULL );		// invoked when bot touches 'other'
+	virtual void OnSight( CBaseEntity *subject );									// when subject initially enters bot's visual awareness
+	virtual void OnLostSight( CBaseEntity *subject );								// when subject leaves enters bot's visual awareness
+	virtual void OnSound( CBaseEntity *source, const CSoundParameters &params );	// when an entity emits a sound
+
+
+private:
+	IBody *m_body;							// to access head aiming
+
+	struct PointOfInterest
+	{
+		enum { ENTITY, POSITION } m_type;
+		CHandle< CBaseEntity > m_entity;
+		Vector m_position;
+
+		IntervalTimer m_duration;			// how long has this PoI been in our attention set
+	};
+
+	CUtlVector< PointOfInterest > m_attentionSet;	// the set of things we are attending to
+
+	
+};
+
+inline int IAttention::CompareSignificance( const CBaseEntity *a, const CBaseEntity *b ) const
+{
+	return 0;
+}
+
+#endif // _NEXT_BOT_ATTENTION_INTERFACE_H_
+

game/server/NextBot/NextBotBodyInterface.cpp

@@ -0,0 +1,55 @@
+// NextBotBodyInterface.cpp
+// Control and information about the bot's body state (posture, animation state, etc)
+// Author: Michael Booth, April 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBot.h"
+#include "NextBotBodyInterface.h"
+
+
+void IBody::AimHeadTowards( const Vector &lookAtPos, LookAtPriorityType priority, float duration, INextBotReply *replyWhenAimed, const char *reason )
+{
+	if ( replyWhenAimed )
+	{
+		replyWhenAimed->OnFail( GetBot(), INextBotReply::FAILED );
+	}
+}
+
+void IBody::AimHeadTowards( CBaseEntity *subject, LookAtPriorityType priority, float duration, INextBotReply *replyWhenAimed, const char *reason )
+{
+	if ( replyWhenAimed )
+	{
+		replyWhenAimed->OnFail( GetBot(), INextBotReply::FAILED );
+	}
+}
+
+bool IBody::SetPosition( const Vector &pos )
+{
+	GetBot()->GetEntity()->SetAbsOrigin( pos );
+	return true;
+}
+
+const Vector &IBody::GetEyePosition( void ) const
+{
+	static Vector eye;
+
+	eye = GetBot()->GetEntity()->WorldSpaceCenter();
+
+	return eye;
+}
+
+const Vector &IBody::GetViewVector( void ) const
+{
+	static Vector view;
+	
+	AngleVectors( GetBot()->GetEntity()->EyeAngles(), &view );
+
+	return view;
+}
+
+bool IBody::IsHeadAimingOnTarget( void ) const
+{
+	return false;
+}

game/server/NextBot/NextBotBodyInterface.h

@@ -0,0 +1,325 @@
+// NextBotBodyInterface.h
+// Control and information about the bot's body state (posture, animation state, etc)
+// Author: Michael Booth, April 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_BODY_INTERFACE_H_
+#define _NEXT_BOT_BODY_INTERFACE_H_
+
+#include "animation.h"
+#include "NextBotComponentInterface.h"
+
+class INextBot;
+struct animevent_t;
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for control and information about the bot's body state (posture, animation state, etc)
+ */
+class IBody : public INextBotComponent
+{
+public:
+	IBody( INextBot *bot ) : INextBotComponent( bot ) { }
+	virtual ~IBody() { }
+
+	virtual void Reset( void ) { INextBotComponent::Reset(); }			// reset to initial state
+	virtual void Update( void ) { }										// update internal state
+
+	/**
+	 * Move the bot to a new position.
+	 * If the body is not currently movable or if it
+	 * is in a motion-controlled animation activity 
+	 * the position will not be changed and false will be returned.
+	 */
+	virtual bool SetPosition( const Vector &pos );
+
+	virtual const Vector &GetEyePosition( void ) const;					// return the eye position of the bot in world coordinates
+	virtual const Vector &GetViewVector( void ) const;					// return the view unit direction vector in world coordinates
+
+	enum LookAtPriorityType
+	{
+		BORING,
+		INTERESTING,				// last known enemy location, dangerous sound location
+		IMPORTANT,					// a danger
+		CRITICAL,					// an active threat to our safety
+		MANDATORY					// nothing can interrupt this look at - two simultaneous look ats with this priority is an error
+	};
+	virtual void AimHeadTowards( const Vector &lookAtPos, 
+								 LookAtPriorityType priority = BORING, 
+								 float duration = 0.0f,
+								 INextBotReply *replyWhenAimed = NULL,
+								 const char *reason = NULL );		// aim the bot's head towards the given goal
+	virtual void AimHeadTowards( CBaseEntity *subject,
+								 LookAtPriorityType priority = BORING, 
+								 float duration = 0.0f,
+								 INextBotReply *replyWhenAimed = NULL,
+								 const char *reason = NULL );		// continually aim the bot's head towards the given subject
+
+	virtual bool IsHeadAimingOnTarget( void ) const;				// return true if the bot's head has achieved its most recent lookat target
+	virtual bool IsHeadSteady( void ) const;						// return true if head is not rapidly turning to look somewhere else
+	virtual float GetHeadSteadyDuration( void ) const;				// return the duration that the bot's head has not been rotating
+	virtual float GetHeadAimSubjectLeadTime( void ) const;			// return how far into the future we should predict our moving subject's position to aim at when tracking subject look-ats
+	virtual float GetHeadAimTrackingInterval( void ) const;			// return how often we should sample our target's position and velocity to update our aim tracking, to allow realistic slop in tracking
+	virtual void ClearPendingAimReply( void ) { }					// clear out currently pending replyWhenAimed callback
+
+	virtual float GetMaxHeadAngularVelocity( void ) const;			// return max turn rate of head in degrees/second
+
+	enum ActivityType 
+	{ 
+		MOTION_CONTROLLED_XY	= 0x0001,	// XY position and orientation of the bot is driven by the animation.
+		MOTION_CONTROLLED_Z		= 0x0002,	// Z position of the bot is driven by the animation.
+		ACTIVITY_UNINTERRUPTIBLE= 0x0004,	// activity can't be changed until animation finishes
+		ACTIVITY_TRANSITORY		= 0x0008,	// a short animation that takes over from the underlying animation momentarily, resuming it upon completion
+		ENTINDEX_PLAYBACK_RATE	= 0x0010,	// played back at different rates based on entindex
+	};
+
+	/**
+	 * Begin an animation activity, return false if we cant do that right now.
+	 */
+	virtual bool StartActivity( Activity act, unsigned int flags = 0 );
+	virtual int SelectAnimationSequence( Activity act ) const;			// given an Activity, select and return a specific animation sequence within it
+
+	virtual Activity GetActivity( void ) const;							// return currently animating activity
+	virtual bool IsActivity( Activity act ) const;						// return true if currently animating activity matches the given one
+	virtual bool HasActivityType( unsigned int flags ) const;			// return true if currently animating activity has any of the given flags
+
+	enum PostureType
+	{
+		STAND,
+		CROUCH,
+		SIT,
+		CRAWL,
+		LIE
+	};
+	virtual void SetDesiredPosture( PostureType posture ) { }			// request a posture change
+	virtual PostureType GetDesiredPosture( void ) const;				// get posture body is trying to assume
+	virtual bool IsDesiredPosture( PostureType posture ) const;			// return true if body is trying to assume this posture
+	virtual bool IsInDesiredPosture( void ) const;						// return true if body's actual posture matches its desired posture
+
+	virtual PostureType GetActualPosture( void ) const;					// return body's current actual posture
+	virtual bool IsActualPosture( PostureType posture ) const;			// return true if body is actually in the given posture
+
+	virtual bool IsPostureMobile( void ) const;							// return true if body's current posture allows it to move around the world
+	virtual bool IsPostureChanging( void ) const;						// return true if body's posture is in the process of changing to new posture
+	
+	
+	/**
+	 * "Arousal" is the level of excitedness/arousal/anxiety of the body.
+	 * Is changes instantaneously to avoid complex interactions with posture transitions.
+	 */
+	enum ArousalType
+	{
+		NEUTRAL,
+		ALERT,
+		INTENSE
+	};
+	virtual void SetArousal( ArousalType arousal ) { }					// arousal level change
+	virtual ArousalType GetArousal( void ) const;						// get arousal level
+	virtual bool IsArousal( ArousalType arousal ) const;				// return true if body is at this arousal level
+
+
+	virtual float GetHullWidth( void ) const;							// width of bot's collision hull in XY plane
+	virtual float GetHullHeight( void ) const;							// height of bot's current collision hull based on posture
+	virtual float GetStandHullHeight( void ) const;						// height of bot's collision hull when standing
+	virtual float GetCrouchHullHeight( void ) const;					// height of bot's collision hull when crouched
+	virtual const Vector &GetHullMins( void ) const;					// return current collision hull minimums based on actual body posture
+	virtual const Vector &GetHullMaxs( void ) const;					// return current collision hull maximums based on actual body posture
+
+	virtual unsigned int GetSolidMask( void ) const;					// return the bot's collision mask (hack until we get a general hull trace abstraction here or in the locomotion interface)
+	virtual unsigned int GetCollisionGroup( void ) const;
+};
+
+
+inline bool IBody::IsHeadSteady( void ) const
+{
+	return true;
+}
+
+inline float IBody::GetHeadSteadyDuration( void ) const
+{
+	return 0.0f;
+}
+
+inline float IBody::GetHeadAimSubjectLeadTime( void ) const
+{
+	return 0.0f;
+}
+
+inline float IBody::GetHeadAimTrackingInterval( void ) const
+{
+	return 0.0f;
+}
+
+inline float IBody::GetMaxHeadAngularVelocity( void ) const
+{
+	return 1000.0f;
+}
+
+inline bool IBody::StartActivity( Activity act, unsigned int flags )
+{
+	return false;
+}
+
+inline int IBody::SelectAnimationSequence( Activity act ) const
+{
+	return 0;
+}
+
+inline Activity IBody::GetActivity( void ) const
+{
+	return ACT_INVALID;
+}
+
+inline bool IBody::IsActivity( Activity act ) const
+{
+	return false;
+}
+
+inline bool IBody::HasActivityType( unsigned int flags ) const
+{
+	return false;
+}
+
+inline IBody::PostureType IBody::GetDesiredPosture( void ) const
+{
+	return IBody::STAND;
+}
+
+inline bool IBody::IsDesiredPosture( PostureType posture ) const
+{
+	return true;
+}
+
+inline bool IBody::IsInDesiredPosture( void ) const
+{
+	return true;
+}
+
+inline IBody::PostureType IBody::GetActualPosture( void ) const
+{
+	return IBody::STAND;
+}
+
+inline bool IBody::IsActualPosture( PostureType posture ) const
+{
+	return true;
+}
+
+inline bool IBody::IsPostureMobile( void ) const
+{
+	return true;
+}
+
+inline bool IBody::IsPostureChanging( void ) const
+{
+	return false;
+}
+
+inline IBody::ArousalType IBody::GetArousal( void ) const
+{
+	return IBody::NEUTRAL;
+}
+
+inline bool IBody::IsArousal( ArousalType arousal ) const
+{
+	return true;
+}
+
+//---------------------------------------------------------------------------------------------------------------------------
+/**
+ * Width of bot's collision hull in XY plane
+ */
+inline float IBody::GetHullWidth( void ) const
+{
+	return 26.0f;
+}
+
+
+//---------------------------------------------------------------------------------------------------------------------------
+/**
+ * Height of bot's current collision hull based on posture
+ */
+inline float IBody::GetHullHeight( void ) const
+{
+	switch( GetActualPosture() )
+	{
+	case LIE:
+		return 16.0f;
+
+	case SIT:
+	case CROUCH:
+		return GetCrouchHullHeight();
+
+	case STAND:
+	default:
+		return GetStandHullHeight();
+	}
+}
+
+
+//---------------------------------------------------------------------------------------------------------------------------
+/**
+ * Height of bot's collision hull when standing
+ */
+inline float IBody::GetStandHullHeight( void ) const
+{
+	return 68.0f;
+}
+
+
+//---------------------------------------------------------------------------------------------------------------------------
+/**
+ * Height of bot's collision hull when crouched
+ */
+inline float IBody::GetCrouchHullHeight( void ) const
+{
+	return 32.0f;
+}
+
+
+//---------------------------------------------------------------------------------------------------------------------------
+/**
+ * Return current collision hull minimums based on actual body posture
+ */
+inline const Vector &IBody::GetHullMins( void ) const
+{
+	static Vector hullMins;
+
+	hullMins.x = -GetHullWidth()/2.0f;
+	hullMins.y = hullMins.x;
+	hullMins.z = 0.0f;
+
+	return hullMins;
+}
+
+
+//---------------------------------------------------------------------------------------------------------------------------
+/**
+ * Return current collision hull maximums based on actual body posture
+ */
+inline const Vector &IBody::GetHullMaxs( void ) const
+{
+	static Vector hullMaxs;
+
+	hullMaxs.x = GetHullWidth()/2.0f;
+	hullMaxs.y = hullMaxs.x;
+	hullMaxs.z = GetHullHeight();
+
+	return hullMaxs;
+}
+
+
+inline unsigned int IBody::GetSolidMask( void ) const
+{
+	return MASK_NPCSOLID;
+}
+
+inline unsigned int IBody::GetCollisionGroup( void ) const
+{
+	return COLLISION_GROUP_NONE;
+}
+
+
+
+#endif // _NEXT_BOT_BODY_INTERFACE_H_

game/server/NextBot/NextBotComponentInterface.cpp

@@ -0,0 +1,24 @@
+// NextBotComponentInterface.cpp
+// Implentation of system methods for NextBot component interface
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBotInterface.h"
+#include "NextBotComponentInterface.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+INextBotComponent::INextBotComponent( INextBot *bot )
+{
+	m_curInterval = TICK_INTERVAL;
+	m_lastUpdateTime = 0;
+	m_bot = bot;
+	
+	// register this component with the bot
+	bot->RegisterComponent( this );
+}
+
+

game/server/NextBot/NextBotComponentInterface.h

@@ -0,0 +1,98 @@
+// NextBotComponentInterface.h
+// Interface for all components
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_COMPONENT_INTERFACE_H_
+#define _NEXT_BOT_COMPONENT_INTERFACE_H_
+
+#include "NextBotEventResponderInterface.h"
+
+class INextBot;
+class Path;
+class CGameTrace;
+class CTakeDamageInfo;
+
+
+//--------------------------------------------------------------------------------------------------------------------------
+/**
+ * Various processes can invoke a "reply" (ie: callback) via instances of this interface
+ */
+class INextBotReply
+{
+public:
+	virtual void OnSuccess( INextBot *bot )  { }						// invoked when process completed successfully
+
+	enum FailureReason
+	{
+		DENIED,
+		INTERRUPTED,
+		FAILED
+	};
+	virtual void OnFail( INextBot *bot, FailureReason reason ) { }		// invoked when process failed
+};
+
+
+//--------------------------------------------------------------------------------------------------------------------------
+/**
+ * Next Bot component interface
+ */
+class INextBotComponent : public INextBotEventResponder
+{
+public:
+	INextBotComponent( INextBot *bot );
+	virtual ~INextBotComponent() { }
+
+	virtual void Reset( void )	{ m_lastUpdateTime = 0; m_curInterval = TICK_INTERVAL; }				// reset to initial state
+	virtual void Update( void ) = 0;									// update internal state
+	virtual void Upkeep( void ) { }										// lightweight update guaranteed to occur every server tick
+
+	inline bool ComputeUpdateInterval();								// return false is no time has elapsed (interval is zero)
+	inline float GetUpdateInterval();
+
+	virtual INextBot *GetBot( void ) const  { return m_bot; }
+	
+private:
+	float m_lastUpdateTime;
+	float m_curInterval;
+
+	friend class INextBot;
+	
+	INextBot *m_bot;
+	INextBotComponent *m_nextComponent;									// simple linked list of components in the bot
+};
+
+
+inline bool INextBotComponent::ComputeUpdateInterval() 
+{ 
+	if ( m_lastUpdateTime ) 
+	{ 
+		float interval = gpGlobals->curtime - m_lastUpdateTime;
+
+		const float minInterval = 0.0001f;
+		if ( interval > minInterval )
+		{
+			m_curInterval = interval;
+			m_lastUpdateTime = gpGlobals->curtime;
+			return true;
+		}
+
+		return false;
+	}
+
+	// First update - assume a reasonable interval.
+	// We need the very first update to do work, for cases
+	// where the bot was just created and we need to propagate
+	// an event to it immediately.
+	m_curInterval = 0.033f;
+	m_lastUpdateTime = gpGlobals->curtime - m_curInterval;
+
+	return true;
+}
+
+inline float INextBotComponent::GetUpdateInterval() 
+{ 
+	return m_curInterval; 
+}
+
+#endif // _NEXT_BOT_COMPONENT_INTERFACE_H_

game/server/NextBot/NextBotContextualQueryInterface.h

@@ -0,0 +1,102 @@
+// NextBotContextualQueryInterface.h
+// Queries within the context of the bot's current behavior state
+// Author: Michael Booth, June 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_CONTEXTUAL_QUERY_H_
+#define _NEXT_BOT_CONTEXTUAL_QUERY_H_
+
+class INextBot;
+class CBaseEntity;
+class CBaseCombatCharacter;
+class Path;
+class CKnownEntity;
+
+/** 
+ * Since behaviors can have several concurrent actions active, we ask
+ * the topmost child action first, and if it defers, its parent, and so
+ * on, until we get a definitive answer.
+ */
+enum QueryResultType
+{
+	ANSWER_NO,
+	ANSWER_YES,
+	ANSWER_UNDEFINED
+};
+
+// Can pass this into IContextualQuery::IsHindrance to see if any hindrance is ever possible
+#define IS_ANY_HINDRANCE_POSSIBLE	( (CBaseEntity*)0xFFFFFFFF )
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for queries that are dependent on the bot's current behavior state
+ */
+class IContextualQuery
+{
+public:
+	virtual ~IContextualQuery() { }
+
+	virtual QueryResultType			ShouldPickUp( const INextBot *me, CBaseEntity *item ) const;		// if the desired item was available right now, should we pick it up?
+	virtual QueryResultType			ShouldHurry( const INextBot *me ) const;							// are we in a hurry?
+	virtual QueryResultType			ShouldRetreat( const INextBot *me ) const;							// is it time to retreat?
+	virtual QueryResultType			ShouldAttack( const INextBot *me, const CKnownEntity *them ) const;	// should we attack "them"?
+	virtual QueryResultType			IsHindrance( const INextBot *me, CBaseEntity *blocker ) const;		// return true if we should wait for 'blocker' that is across our path somewhere up ahead.
+
+	virtual Vector					SelectTargetPoint( const INextBot *me, const CBaseCombatCharacter *subject ) const;		// given a subject, return the world space position we should aim at
+
+	/**
+	 * Allow bot to approve of positions game movement tries to put him into.
+	 * This is most useful for bots derived from CBasePlayer that go through
+	 * the player movement system.
+	 */
+	virtual QueryResultType IsPositionAllowed( const INextBot *me, const Vector &pos ) const;
+
+	virtual const CKnownEntity *	SelectMoreDangerousThreat( const INextBot *me, 
+															   const CBaseCombatCharacter *subject,
+															   const CKnownEntity *threat1, 
+															   const CKnownEntity *threat2 ) const;	// return the more dangerous of the two threats to 'subject', or NULL if we have no opinion
+};
+
+inline QueryResultType IContextualQuery::ShouldPickUp( const INextBot *me, CBaseEntity *item ) const
+{
+	return ANSWER_UNDEFINED;
+}
+
+inline QueryResultType IContextualQuery::ShouldHurry( const INextBot *me ) const
+{
+	return ANSWER_UNDEFINED;
+}
+
+inline QueryResultType IContextualQuery::ShouldRetreat( const INextBot *me ) const
+{
+	return ANSWER_UNDEFINED;
+}
+
+inline QueryResultType IContextualQuery::ShouldAttack( const INextBot *me, const CKnownEntity *them ) const
+{
+	return ANSWER_UNDEFINED;
+}
+
+inline QueryResultType IContextualQuery::IsHindrance( const INextBot *me, CBaseEntity *blocker ) const
+{
+	return ANSWER_UNDEFINED;
+}
+
+inline Vector IContextualQuery::SelectTargetPoint( const INextBot *me, const CBaseCombatCharacter *subject ) const
+{
+	return vec3_origin;
+}
+
+inline QueryResultType IContextualQuery::IsPositionAllowed( const INextBot *me, const Vector &pos ) const
+{
+	return ANSWER_UNDEFINED;
+}
+
+inline const CKnownEntity *IContextualQuery::SelectMoreDangerousThreat( const INextBot *me, const CBaseCombatCharacter *subject, const CKnownEntity *threat1, const CKnownEntity *threat2 ) const
+{
+	return NULL;
+}
+
+
+#endif // _NEXT_BOT_CONTEXTUAL_QUERY_H_

game/server/NextBot/NextBotDebug.h

@@ -0,0 +1,23 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+#ifndef NEXTBOT_DEBUG_H
+#define NEXTBOT_DEBUG_H
+//------------------------------------------------------------------------------
+// Debug flags for nextbot
+
+enum NextBotDebugType 
+{
+	NEXTBOT_DEBUG_NONE = 0,
+	NEXTBOT_BEHAVIOR	= 0x0001,
+	NEXTBOT_LOOK_AT		= 0x0002,
+	NEXTBOT_PATH		= 0x0004,
+	NEXTBOT_ANIMATION	= 0x0008,
+	NEXTBOT_LOCOMOTION	= 0x0010,
+	NEXTBOT_VISION		= 0x0020,
+	NEXTBOT_HEARING		= 0x0040,
+	NEXTBOT_EVENTS		= 0x0080,
+	NEXTBOT_ERRORS		= 0x0100,		// when things go wrong, like being stuck
+
+	NEXTBOT_DEBUG_ALL	= 0xFFFF
+};
+
+#endif

game/server/NextBot/NextBotEventResponderInterface.h

@@ -0,0 +1,550 @@
+// NextBotEventResponderInterface.h
+// Interface for propagating and responding to events
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_EVENT_RESPONDER_INTERFACE_H_
+#define _NEXT_BOT_EVENT_RESPONDER_INTERFACE_H_
+
+class Path;
+class CTakeDamageInfo;
+class CBaseEntity;
+class CDOTABaseAbility;
+
+struct CSoundParameters;
+struct animevent_t;
+
+#include "ai_speech.h"
+
+
+//--------------------------------------------------------------------------------------------------------------------------
+enum MoveToFailureType
+{
+	FAIL_NO_PATH_EXISTS,
+	FAIL_STUCK,
+	FAIL_FELL_OFF,
+};
+
+//--------------------------------------------------------------------------------------------------------------------------
+/**
+ * Events propagated to/between components.
+ * To add an event, add its signature here and implement its propagation
+ * to derived classes via FirstContainedResponder() and NextContainedResponder().
+ * NOTE: Also add a translator to the Action class in NextBotBehavior.h.
+ */
+class INextBotEventResponder
+{
+public:
+	DECLARE_CLASS_NOBASE( INextBotEventResponder );
+	
+	virtual ~INextBotEventResponder() { }
+	
+	// these methods are used by derived classes to define how events propagate
+	virtual INextBotEventResponder *FirstContainedResponder( void ) const  { return NULL; }
+	virtual INextBotEventResponder *NextContainedResponder( INextBotEventResponder *current ) const { return NULL; }
+	
+	//
+	// Events.  All events must be 'extended' by calling the derived class explicitly to ensure propagation.
+	// Each event must implement its propagation in this interface class.
+	//
+	virtual void OnLeaveGround( CBaseEntity *ground );		// invoked when bot leaves ground for any reason
+	virtual void OnLandOnGround( CBaseEntity *ground );		// invoked when bot lands on the ground after being in the air
+
+	virtual void OnContact( CBaseEntity *other, CGameTrace *result = NULL );	// invoked when bot touches 'other'
+
+	virtual void OnMoveToSuccess( const Path *path );		// invoked when a bot reaches the end of the given Path
+	virtual void OnMoveToFailure( const Path *path, MoveToFailureType reason );	// invoked when a bot fails to reach the end of the given Path
+	virtual void OnStuck( void );							// invoked when bot becomes stuck while trying to move
+	virtual void OnUnStuck( void );							// invoked when a previously stuck bot becomes un-stuck and can again move
+
+	virtual void OnPostureChanged( void );					// when bot has assumed new posture (query IBody for posture)
+
+	virtual void OnAnimationActivityComplete( int activity );	// when animation activity has finished playing
+	virtual void OnAnimationActivityInterrupted( int activity );// when animation activity was replaced by another animation
+	virtual void OnAnimationEvent( animevent_t *event );	// when a QC-file animation event is triggered by the current animation sequence
+
+	virtual void OnIgnite( void );							// when bot starts to burn
+	virtual void OnInjured( const CTakeDamageInfo &info );	// when bot is damaged by something
+	virtual void OnKilled( const CTakeDamageInfo &info );	// when the bot's health reaches zero
+	virtual void OnOtherKilled( CBaseCombatCharacter *victim, const CTakeDamageInfo &info );	// when someone else dies
+
+	virtual void OnSight( CBaseEntity *subject );			// when subject initially enters bot's visual awareness
+	virtual void OnLostSight( CBaseEntity *subject );		// when subject leaves enters bot's visual awareness
+
+	virtual void OnSound( CBaseEntity *source, const Vector &pos, KeyValues *keys );				// when an entity emits a sound. "pos" is world coordinates of sound. "keys" are from sound's GameData
+	virtual void OnSpokeConcept( CBaseCombatCharacter *who, AIConcept_t concept, AI_Response *response );	// when an Actor speaks a concept
+	virtual void OnWeaponFired( CBaseCombatCharacter *whoFired, CBaseCombatWeapon *weapon );		// when someone fires a weapon
+
+	virtual void OnNavAreaChanged( CNavArea *newArea, CNavArea *oldArea );	// when bot enters a new navigation area
+
+	virtual void OnModelChanged( void );					// when the entity's model has been changed	
+
+	virtual void OnPickUp( CBaseEntity *item, CBaseCombatCharacter *giver );	// when something is added to our inventory
+	virtual void OnDrop( CBaseEntity *item );									// when something is removed from our inventory
+	virtual void OnActorEmoted( CBaseCombatCharacter *emoter, int emote );			// when "emoter" does an "emote" (ie: manual voice command, etc)
+
+	virtual void OnCommandAttack( CBaseEntity *victim );	// attack the given entity
+	virtual void OnCommandApproach( const Vector &pos, float range = 0.0f );	// move to within range of the given position
+	virtual void OnCommandApproach( CBaseEntity *goal );	// follow the given leader
+	virtual void OnCommandRetreat( CBaseEntity *threat, float range = 0.0f );	// retreat from the threat at least range units away (0 == infinite)
+	virtual void OnCommandPause( float duration = 0.0f );	// pause for the given duration (0 == forever)
+	virtual void OnCommandResume( void );					// resume after a pause
+
+	virtual void OnCommandString( const char *command );	// for debugging: respond to an arbitrary string representing a generalized command
+
+	virtual void OnShoved( CBaseEntity *pusher );			// 'pusher' has shoved me
+	virtual void OnBlinded( CBaseEntity *blinder );			// 'blinder' has blinded me with a flash of light
+
+	virtual void OnTerritoryContested( int territoryID );	// territory has been invaded and is changing ownership
+	virtual void OnTerritoryCaptured( int territoryID );	// we have captured enemy territory
+	virtual void OnTerritoryLost( int territoryID );		// we have lost territory to the enemy
+
+	virtual void OnWin( void );
+	virtual void OnLose( void );
+
+#ifdef DOTA_SERVER_DLL
+	virtual void OnCommandMoveTo( const Vector &pos );
+	virtual void OnCommandMoveToAggressive( const Vector &pos );
+	virtual void OnCommandAttack( CBaseEntity *victim, bool bDeny );
+	virtual void OnCastAbilityNoTarget( CDOTABaseAbility *ability );
+	virtual void OnCastAbilityOnPosition( CDOTABaseAbility *ability, const Vector &pos );
+	virtual void OnCastAbilityOnTarget( CDOTABaseAbility *ability, CBaseEntity *target );
+	virtual void OnDropItem( const Vector &pos, CBaseEntity *item );
+	virtual void OnPickupItem( CBaseEntity *item );
+	virtual void OnPickupRune( CBaseEntity *item );
+	virtual void OnStop();
+	virtual void OnFriendThreatened( CBaseEntity *friendly, CBaseEntity *threat );
+	virtual void OnCancelAttack( CBaseEntity *pTarget );
+	virtual void OnDominated();
+	virtual void OnWarped( Vector vStartPos );
+#endif
+};
+
+
+inline void INextBotEventResponder::OnLeaveGround( CBaseEntity *ground )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnLeaveGround( ground );
+	}	
+}
+
+inline void INextBotEventResponder::OnLandOnGround( CBaseEntity *ground )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnLandOnGround( ground );
+	}	
+}
+
+inline void INextBotEventResponder::OnContact( CBaseEntity *other, CGameTrace *result )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnContact( other, result );
+	}	
+}
+
+inline void INextBotEventResponder::OnMoveToSuccess( const Path *path )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnMoveToSuccess( path );
+	}	
+}
+
+inline void INextBotEventResponder::OnMoveToFailure( const Path *path, MoveToFailureType reason )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnMoveToFailure( path, reason );
+	}	
+}
+
+inline void INextBotEventResponder::OnStuck( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnStuck();
+	}	
+}
+
+inline void INextBotEventResponder::OnUnStuck( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnUnStuck();
+	}	
+}
+
+inline void INextBotEventResponder::OnPostureChanged( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnPostureChanged();
+	}	
+}
+
+inline void INextBotEventResponder::OnAnimationActivityComplete( int activity )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnAnimationActivityComplete( activity );
+	}	
+}
+
+inline void INextBotEventResponder::OnAnimationActivityInterrupted( int activity )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnAnimationActivityInterrupted( activity );
+	}	
+}
+
+inline void INextBotEventResponder::OnAnimationEvent( animevent_t *event )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnAnimationEvent( event );
+	}	
+}
+
+inline void INextBotEventResponder::OnIgnite( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnIgnite();
+	}	
+}
+
+inline void INextBotEventResponder::OnInjured( const CTakeDamageInfo &info )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnInjured( info );
+	}	
+}
+
+inline void INextBotEventResponder::OnKilled( const CTakeDamageInfo &info )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnKilled( info );
+	}	
+}
+
+inline void INextBotEventResponder::OnOtherKilled( CBaseCombatCharacter *victim, const CTakeDamageInfo &info )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnOtherKilled( victim, info );
+	}	
+}
+
+inline void INextBotEventResponder::OnSight( CBaseEntity *subject )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnSight( subject );
+	}	
+}
+
+inline void INextBotEventResponder::OnLostSight( CBaseEntity *subject )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnLostSight( subject );
+	}	
+}
+
+inline void INextBotEventResponder::OnSound( CBaseEntity *source, const Vector &pos, KeyValues *keys )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnSound( source, pos, keys );
+	}	
+}
+
+inline void INextBotEventResponder::OnSpokeConcept( CBaseCombatCharacter *who, AIConcept_t concept, AI_Response *response )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnSpokeConcept( who, concept, response );
+	}	
+}
+
+inline void INextBotEventResponder::OnWeaponFired( CBaseCombatCharacter *whoFired, CBaseCombatWeapon *weapon )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnWeaponFired( whoFired, weapon );
+	}	
+}
+
+inline void INextBotEventResponder::OnNavAreaChanged( CNavArea *newArea, CNavArea *oldArea )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnNavAreaChanged( newArea, oldArea );
+	}	
+}
+
+inline void INextBotEventResponder::OnModelChanged( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnModelChanged();
+	}	
+}
+
+inline void INextBotEventResponder::OnPickUp( CBaseEntity *item, CBaseCombatCharacter *giver )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnPickUp( item, giver );
+	}	
+}
+
+inline void INextBotEventResponder::OnDrop( CBaseEntity *item )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnDrop( item );
+	}	
+}
+
+inline void INextBotEventResponder::OnActorEmoted( CBaseCombatCharacter *emoter, int emote )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnActorEmoted( emoter, emote );
+	}	
+}
+
+inline void INextBotEventResponder::OnShoved( CBaseEntity *pusher )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnShoved( pusher );
+	}	
+}
+
+inline void INextBotEventResponder::OnBlinded( CBaseEntity *blinder )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnBlinded( blinder );
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandAttack( CBaseEntity *victim )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandAttack( victim );
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandApproach( const Vector &pos, float range )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandApproach( pos, range );
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandApproach( CBaseEntity *goal )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandApproach( goal );
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandRetreat( CBaseEntity *threat, float range )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandRetreat( threat, range );
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandPause( float duration )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandPause( duration );
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandResume( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandResume();
+	}	
+}
+
+inline void INextBotEventResponder::OnCommandString( const char *command )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandString( command );
+	}	
+}
+
+inline void INextBotEventResponder::OnTerritoryContested( int territoryID )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnTerritoryContested( territoryID );
+	}	
+}
+
+inline void INextBotEventResponder::OnTerritoryCaptured( int territoryID )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnTerritoryCaptured( territoryID );
+	}	
+}
+
+inline void INextBotEventResponder::OnTerritoryLost( int territoryID )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnTerritoryLost( territoryID );
+	}	
+}
+
+inline void INextBotEventResponder::OnWin( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnWin();
+	}	
+}
+
+inline void INextBotEventResponder::OnLose( void )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnLose();
+	}	
+}
+
+#ifdef DOTA_SERVER_DLL
+inline void INextBotEventResponder::OnCommandMoveTo( const Vector &pos )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandMoveTo( pos );
+	}
+}
+
+inline void INextBotEventResponder::OnCommandMoveToAggressive( const Vector &pos )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandMoveToAggressive( pos );
+	}
+}
+
+inline void INextBotEventResponder::OnCommandAttack( CBaseEntity *victim, bool bDeny )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCommandAttack( victim, bDeny );
+	}	
+}
+
+inline void INextBotEventResponder::OnCastAbilityNoTarget( CDOTABaseAbility *ability )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCastAbilityNoTarget( ability );
+	}	
+}
+
+inline void INextBotEventResponder::OnCastAbilityOnPosition( CDOTABaseAbility *ability, const Vector &pos )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCastAbilityOnPosition( ability, pos );
+	}	
+}
+
+inline void INextBotEventResponder::OnCastAbilityOnTarget( CDOTABaseAbility *ability, CBaseEntity *target )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCastAbilityOnTarget( ability, target );
+	}	
+}
+
+inline void INextBotEventResponder::OnDropItem( const Vector &pos, CBaseEntity *item )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnDropItem( pos, item );
+	}	
+}
+
+inline void INextBotEventResponder::OnPickupItem( CBaseEntity *item )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnPickupItem( item );
+	}	
+}
+
+inline void INextBotEventResponder::OnPickupRune( CBaseEntity *item )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnPickupRune( item );
+	}	
+}
+
+inline void INextBotEventResponder::OnStop()
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnStop();
+	}	
+}
+
+inline void INextBotEventResponder::OnFriendThreatened( CBaseEntity *friendly, CBaseEntity *threat )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnFriendThreatened( friendly, threat );
+	}	
+}
+
+inline void INextBotEventResponder::OnCancelAttack( CBaseEntity *pTarget )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnCancelAttack( pTarget );
+	}	
+}
+
+inline void INextBotEventResponder::OnDominated()
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnDominated();
+	}	
+}
+
+inline void INextBotEventResponder::OnWarped( Vector vStartPos )
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		sub->OnWarped( vStartPos );
+	}	
+}
+#endif
+
+#endif // _NEXT_BOT_EVENT_RESPONDER_INTERFACE_H_

game/server/NextBot/NextBotGroundLocomotion.h

@@ -0,0 +1,274 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+// NextBotGroundLocomotion.h
+// Basic ground-based movement for NextBotCombatCharacters
+// Author: Michael Booth, February 2009
+// Note: This is a refactoring of ZombieBotLocomotion from L4D
+
+#ifndef NEXT_BOT_GROUND_LOCOMOTION_H
+#define NEXT_BOT_GROUND_LOCOMOTION_H
+
+#include "NextBotLocomotionInterface.h"
+#include "nav_mesh.h"
+
+
+class NextBotCombatCharacter;
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Basic ground-based movement for NextBotCombatCharacters.
+ * This locomotor resolves collisions and assumes a ground-based bot under the influence of gravity.
+ */
+class NextBotGroundLocomotion : public ILocomotion
+{
+public:
+	DECLARE_CLASS( NextBotGroundLocomotion, ILocomotion );
+
+	NextBotGroundLocomotion( INextBot *bot );
+	virtual ~NextBotGroundLocomotion();
+	
+	virtual void Reset( void );							// reset locomotor to initial state
+	virtual void Update( void );						// update internal state
+
+	virtual void Approach( const Vector &pos, float goalWeight = 1.0f );	// move directly towards the given position
+	virtual void DriveTo( const Vector &pos );			// Move the bot to the precise given position immediately, 
+
+	virtual bool ClimbUpToLedge( const Vector &landingGoal, const Vector &landingForward, const CBaseEntity *obstacle );	// initiate a jump to an adjacent high ledge, return false if climb can't start
+	virtual void JumpAcrossGap( const Vector &landingGoal, const Vector &landingForward );	// initiate a jump across an empty volume of space to far side
+	virtual void Jump( void );							// initiate a simple undirected jump in the air
+	virtual bool IsClimbingOrJumping( void ) const;		// is jumping in any form
+	virtual bool IsClimbingUpToLedge( void ) const;		// is climbing up to a high ledge
+	virtual bool IsJumpingAcrossGap( void ) const;		// is jumping across a gap to the far side
+
+	virtual void Run( void );							// set desired movement speed to running
+	virtual void Walk( void );							// set desired movement speed to walking
+	virtual void Stop( void );							// set desired movement speed to stopped
+	virtual bool IsRunning( void ) const;
+	virtual void SetDesiredSpeed( float speed );		// set desired speed for locomotor movement
+	virtual float GetDesiredSpeed( void ) const;		// returns the current desired speed
+
+	virtual float GetSpeedLimit( void ) const;			// get maximum speed bot can reach, regardless of desired speed
+
+	virtual bool IsOnGround( void ) const;				// return true if standing on something
+	virtual void OnLeaveGround( CBaseEntity *ground );	// invoked when bot leaves ground for any reason
+	virtual void OnLandOnGround( CBaseEntity *ground );	// invoked when bot lands on the ground after being in the air
+	virtual CBaseEntity *GetGround( void ) const;		// return the current ground entity or NULL if not on the ground
+	virtual const Vector &GetGroundNormal( void ) const;// surface normal of the ground we are in contact with
+
+	virtual void ClimbLadder( const CNavLadder *ladder, const CNavArea *dismountGoal );		// climb the given ladder to the top and dismount
+	virtual void DescendLadder( const CNavLadder *ladder, const CNavArea *dismountGoal );		// descend the given ladder to the bottom and dismount
+	virtual bool IsUsingLadder( void ) const;
+	virtual bool IsAscendingOrDescendingLadder( void ) const;	// we are actually on the ladder right now, either climbing up or down
+
+	virtual void FaceTowards( const Vector &target );	// rotate body to face towards "target"
+
+	virtual void SetDesiredLean( const QAngle &lean );
+	virtual const QAngle &GetDesiredLean( void ) const;
+
+	virtual const Vector &GetFeet( void ) const;		// return position of "feet" - the driving point where the bot contacts the ground
+
+	virtual float GetStepHeight( void ) const;			// if delta Z is greater than this, we have to jump to get up
+	virtual float GetMaxJumpHeight( void ) const;		// return maximum height of a jump
+	virtual float GetDeathDropHeight( void ) const;		// distance at which we will die if we fall
+
+	virtual float GetRunSpeed( void ) const;			// get maximum running speed
+	virtual float GetWalkSpeed( void ) const;			// get maximum walking speed
+
+	virtual float GetMaxAcceleration( void ) const;		// return maximum acceleration of locomotor
+	virtual float GetMaxDeceleration( void ) const;		// return maximum deceleration of locomotor
+
+	virtual const Vector &GetAcceleration( void ) const;	// return current world space acceleration
+	virtual void SetAcceleration( const Vector &accel );	// set world space acceleration
+
+	virtual const Vector &GetVelocity( void ) const;	// return current world space velocity
+	virtual void SetVelocity( const Vector &vel );		// set world space velocity
+
+	virtual void OnMoveToSuccess( const Path *path );		// invoked when an bot reaches its MoveTo goal
+	virtual void OnMoveToFailure( const Path *path, MoveToFailureType reason );	// invoked when an bot fails to reach a MoveTo goal
+
+private:
+	void UpdatePosition( const Vector &newPos );			// move to newPos, resolving any collisions along the way
+	void UpdateGroundConstraint( void );					// keep ground solid
+	Vector ResolveCollisionV0( Vector from, Vector to, int recursionLimit );
+
+	Vector ResolveZombieCollisions( const Vector &pos );	// push away zombies that are interpenetrating
+	Vector ResolveCollision( const Vector &from, const Vector &to, int recursionLimit );	// check for collisions along move
+	bool DetectCollision( trace_t *pTrace, int &nDestructionAllowed, const Vector &from, const Vector &to, const Vector &vecMins, const Vector &vecMaxs );
+	void ApplyAccumulatedApproach( void );
+	bool DidJustJump( void ) const;							// return true if we just started a jump
+	bool TraverseLadder( void );							// return true if we are climbing a ladder
+
+	virtual float GetGravity( void ) const;					// return gravity force acting on bot
+	virtual float GetFrictionForward( void ) const;			// return magnitude of forward friction
+	virtual float GetFrictionSideways( void ) const;		// return magnitude of lateral friction
+	virtual float GetMaxYawRate( void ) const;				// return max rate of yaw rotation
+
+
+private:
+	NextBotCombatCharacter *m_nextBot;
+
+	Vector m_priorPos;										// last update's position
+	Vector m_lastValidPos;									// last valid position (not interpenetrating)
+	
+	Vector m_acceleration;
+	Vector m_velocity;
+	
+	float m_desiredSpeed;									// speed bot wants to be moving
+	float m_actualSpeed;									// actual speed bot is moving
+
+	float m_maxRunSpeed;
+
+	float m_forwardLean;
+	float m_sideLean;
+	QAngle m_desiredLean;
+	
+	bool m_isJumping;										// if true, we have jumped and have not yet hit the ground
+	bool m_isJumpingAcrossGap;								// if true, we have jumped across a gap and have not yet hit the ground
+	EHANDLE m_ground;										// have to manage this ourselves, since MOVETYPE_CUSTOM always NULLs out GetGroundEntity()
+	Vector m_groundNormal;									// surface normal of the ground we are in contact with
+	bool m_isClimbingUpToLedge;									// true if we are jumping up to an adjacent ledge
+	Vector m_ledgeJumpGoalPos;
+	bool m_isUsingFullFeetTrace;							// true if we're in the air and tracing the lowest StepHeight in ResolveCollision
+
+	const CNavLadder *m_ladder;								// ladder we are currently climbing/descending
+	const CNavArea *m_ladderDismountGoal;					// the area we enter when finished with our ladder move
+	bool m_isGoingUpLadder;									// if false, we're going down
+
+	CountdownTimer m_inhibitObstacleAvoidanceTimer;			// when active, turn off path following feelers
+
+	CountdownTimer m_wiggleTimer;							// for wiggling
+	NavRelativeDirType m_wiggleDirection;
+
+	mutable Vector m_eyePos;								// for use with GetEyes(), etc.
+
+	Vector m_moveVector;									// the direction of our motion in XY plane
+	float m_moveYaw;										// global yaw of movement direction
+
+	Vector m_accumApproachVectors;							// weighted sum of Approach() calls since last update
+	float m_accumApproachWeights;
+	bool m_bRecomputePostureOnCollision;
+
+	CountdownTimer m_ignorePhysicsPropTimer;				// if active, don't collide with physics props (because we got stuck in one)
+	EHANDLE m_ignorePhysicsProp;							// which prop to ignore
+};
+
+
+inline float NextBotGroundLocomotion::GetGravity( void ) const
+{
+	return 1000.0f;
+}
+
+inline float NextBotGroundLocomotion::GetFrictionForward( void ) const
+{
+	return 0.0f;
+}
+
+inline float NextBotGroundLocomotion::GetFrictionSideways( void ) const
+{
+	return 3.0f;
+}
+
+inline float NextBotGroundLocomotion::GetMaxYawRate( void ) const
+{
+	return 250.0f;
+}
+
+inline CBaseEntity *NextBotGroundLocomotion::GetGround( void ) const
+{
+	return m_ground;
+}
+
+
+inline const Vector &NextBotGroundLocomotion::GetGroundNormal( void ) const
+{
+	return m_groundNormal;
+}
+
+
+inline void NextBotGroundLocomotion::SetDesiredLean( const QAngle &lean )
+{
+	m_desiredLean = lean;
+}
+
+
+inline const QAngle &NextBotGroundLocomotion::GetDesiredLean( void ) const
+{
+	return m_desiredLean;
+}
+
+
+inline void NextBotGroundLocomotion::SetDesiredSpeed( float speed )
+{
+	m_desiredSpeed = speed;
+}
+
+
+inline float NextBotGroundLocomotion::GetDesiredSpeed( void ) const
+{
+	return m_desiredSpeed;
+}
+
+
+inline bool NextBotGroundLocomotion::IsClimbingOrJumping( void ) const
+{
+	return m_isJumping;
+}
+
+inline bool NextBotGroundLocomotion::IsClimbingUpToLedge( void ) const
+{
+	return m_isClimbingUpToLedge;
+}
+
+inline bool NextBotGroundLocomotion::IsJumpingAcrossGap( void ) const
+{
+	return m_isJumpingAcrossGap;
+}
+
+inline bool NextBotGroundLocomotion::IsRunning( void ) const
+{
+	/// @todo Rethink interface to distinguish actual state vs desired state (do we want to be running, or are we actually at running speed right now)
+	return m_actualSpeed > 0.9f * GetRunSpeed();
+}
+
+
+inline float NextBotGroundLocomotion::GetStepHeight( void ) const
+{
+	return 18.0f;
+}
+
+
+inline float NextBotGroundLocomotion::GetMaxJumpHeight( void ) const
+{
+	return 180.0f; // 120.0f; // 84.0f; // 58.0f;
+}
+
+
+inline float NextBotGroundLocomotion::GetDeathDropHeight( void ) const
+{
+	return 200.0f;
+}
+
+
+inline float NextBotGroundLocomotion::GetRunSpeed( void ) const
+{
+	return 150.0f;
+}
+
+
+inline float NextBotGroundLocomotion::GetWalkSpeed( void ) const
+{
+	return 75.0f;
+}
+
+inline float NextBotGroundLocomotion::GetMaxAcceleration( void ) const
+{
+	return 500.0f;
+}
+
+inline float NextBotGroundLocomotion::GetMaxDeceleration( void ) const
+{
+	return 500.0f;
+}
+
+
+#endif // NEXT_BOT_GROUND_LOCOMOTION_H
+

game/server/NextBot/NextBotHearingInterface.h

@@ -0,0 +1,34 @@
+// NextBotHearingInterface.h
+// Interface for auditory queries of a bot
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_HEARING_INTERFACE_H_
+#define _NEXT_BOT_HEARING_INTERFACE_H_
+
+#include "NextBotComponentInterface.h"
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for hearing sounds
+ */
+class IHearing : public INextBotComponent
+{
+public:
+	IHearing( INextBot *bot ) : INextBotComponent( bot ) { }
+	virtual ~IHearing() { }
+
+	virtual void Reset( void );									// reset to initial state
+	virtual void Update( void );								// update internal state
+
+	virtual float GetTimeSinceHeard( int team ) const;			// return time since we heard any member of the given team
+
+	virtual CBaseEntity *GetClosestRecognized( int team = TEAM_ANY ) const;	// return the closest recognized entity
+	virtual int GetRecognizedCount( int team, float rangeLimit = -1.0f ) const;	// return the number of actors on the given team visible to us closer than rangeLimit
+
+	virtual float GetMaxHearingRange( void ) const;				// return maximum distance we can hear
+	virtual float GetMinRecognizeTime( void ) const;			// return HEARING reaction time
+};
+
+
+#endif // _NEXT_BOT_HEARING_INTERFACE_H_

game/server/NextBot/NextBotIntentionInterface.cpp

@@ -0,0 +1,91 @@
+// NextBotIntentionInterface.cpp
+// Interface for intentional thinking
+// Author: Michael Booth, November 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBotInterface.h"
+#include "NextBotIntentionInterface.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+//------------------------------------------------------------------------------------------------------------------------
+/**
+ * Given a subject, return the world space position we should aim at
+ */
+Vector IIntention::SelectTargetPoint( const INextBot *me, const CBaseCombatCharacter *subject ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			Vector result = query->SelectTargetPoint( me, subject );
+			if ( result != vec3_origin )
+			{
+				return result;
+			}
+		}
+	}	
+
+	// no answer, use a reasonable position
+	Vector threatMins, threatMaxs;
+	subject->CollisionProp()->WorldSpaceAABB( &threatMins, &threatMaxs );
+	Vector targetPoint = subject->GetAbsOrigin();
+	targetPoint.z += 0.7f * ( threatMaxs.z - threatMins.z );
+
+	return targetPoint;
+}
+
+
+//------------------------------------------------------------------------------------------------------------------------
+/**
+ * Given two threats, decide which one is more dangerous
+ */
+const CKnownEntity *IIntention::SelectMoreDangerousThreat( const INextBot *me, const CBaseCombatCharacter *subject, const CKnownEntity *threat1, const CKnownEntity *threat2 ) const
+{
+	if ( !threat1 || threat1->IsObsolete() )
+	{
+		if ( threat2 && !threat2->IsObsolete() )
+			return threat2;
+
+		return NULL;
+	}
+	else if ( !threat2 || threat2->IsObsolete() )
+	{
+		return threat1;
+	}
+
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			const CKnownEntity *result = query->SelectMoreDangerousThreat( me, subject, threat1, threat2 );
+			if ( result )
+			{
+				return result;
+			}
+		}
+	}
+
+	// no specific decision was made - return closest threat as most dangerous
+	float range1 = ( subject->GetAbsOrigin() - threat1->GetLastKnownPosition() ).LengthSqr();
+	float range2 = ( subject->GetAbsOrigin() - threat2->GetLastKnownPosition() ).LengthSqr();
+
+	if ( range1 < range2 )
+	{
+		return threat1;
+	}
+
+	return threat2;
+}
+
+
+
+

game/server/NextBot/NextBotIntentionInterface.h

@@ -0,0 +1,211 @@
+// NextBotIntentionInterface.h
+// Interface for intentional thinking
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_INTENTION_INTERFACE_H_
+#define _NEXT_BOT_INTENTION_INTERFACE_H_
+
+#include "NextBotComponentInterface.h"
+#include "NextBotContextualQueryInterface.h"
+
+class INextBot;
+
+//
+// Insert this macro in your INextBot-derived class declaration to
+// create a IIntention-derived class that handles the bookkeeping
+// of instantiating a Behavior with an initial Action and updating it.
+//
+#define DECLARE_INTENTION_INTERFACE( Actor )	\
+												\
+	class Actor##Intention : public IIntention	\
+	{											\
+	public:										\
+		Actor##Intention( Actor *me );			\
+		virtual ~Actor##Intention();			\
+		virtual void Reset( void );				\
+		virtual void Update( void );			\
+		virtual INextBotEventResponder *FirstContainedResponder( void ) const  { return m_behavior; }	\
+		virtual INextBotEventResponder *NextContainedResponder( INextBotEventResponder *current ) const { return NULL; }	\
+	private:									\
+		Behavior< Actor > *m_behavior;			\
+	};											\
+												\
+	public: virtual IIntention *GetIntentionInterface( void ) const 	{ return m_intention; }	\
+	private: Actor##Intention *m_intention;		\
+	public:										
+
+
+//
+// Use this macro to create the implementation code for the IIntention-derived class
+// declared above.  Since this requires InitialAction, it must occur after
+// that Action has been declared, so it can be new'd here.
+//
+#define IMPLEMENT_INTENTION_INTERFACE( Actor, InitialAction ) \
+	Actor::Actor##Intention::Actor##Intention( Actor *me ) : IIntention( me )	{ m_behavior = new Behavior< Actor >( new InitialAction ); }	\
+	Actor::Actor##Intention::~Actor##Intention() {	delete m_behavior; }	\
+	void Actor::Actor##Intention::Reset( void ) { delete m_behavior; m_behavior = new Behavior< Actor >( new InitialAction ); }	\
+	void Actor::Actor##Intention::Update( void ) { m_behavior->Update( static_cast< Actor * >( GetBot() ), GetUpdateInterval() ); }
+
+
+//
+// Use this macro in the constructor of your bot to allocate the IIntention-derived class
+//
+#define ALLOCATE_INTENTION_INTERFACE( Actor )	{ m_intention = new Actor##Intention( this ); }
+
+//
+// Use this macro in the destructor of your bot to deallocate the IIntention-derived class
+//
+#define DEALLOCATE_INTENTION_INTERFACE	{ if ( m_intention ) delete m_intention; }
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for intentional thinking.
+ * The assumption is that this is a container for one or more concurrent Behaviors.
+ * The "primary" Behavior is the FirstContainedResponder, and so on.  
+ * IContextualQuery requests are prioritized in contained responder order, such that the first responder
+ * that returns a definitive answer is accepted.  WITHIN a given responder (ie: a Behavior), the deepest child
+ * Behavior in the active stack is asked first, then its parent, and so on, allowing the most specific active
+ * Behavior to override the query responses of its more general parent Behaviors.
+ */
+class IIntention : public INextBotComponent, public IContextualQuery
+{
+public:
+	IIntention( INextBot *bot ) : INextBotComponent( bot ) { }
+	virtual ~IIntention() { }
+
+	virtual void Reset( void )  { INextBotComponent::Reset(); }	// reset to initial state
+	virtual void Update( void ) { }								// update internal state
+
+	// IContextualQuery propagation --------------------------------
+	virtual QueryResultType			ShouldPickUp( const INextBot *me, CBaseEntity *item ) const;		// if the desired item was available right now, should we pick it up?
+	virtual QueryResultType			ShouldHurry( const INextBot *me ) const;							// are we in a hurry?
+	virtual QueryResultType			ShouldRetreat( const INextBot *me ) const;							// is it time to retreat?
+	virtual QueryResultType			ShouldAttack( const INextBot *me, const CKnownEntity *them ) const;	// should we attack "them"?
+	virtual QueryResultType			IsHindrance( const INextBot *me, CBaseEntity *blocker ) const;		// return true if we should wait for 'blocker' that is across our path somewhere up ahead.
+	virtual Vector					SelectTargetPoint( const INextBot *me, const CBaseCombatCharacter *subject ) const;		// given a subject, return the world space position we should aim at
+	virtual QueryResultType			IsPositionAllowed( const INextBot *me, const Vector &pos ) const;	// is the a place we can be?
+	virtual const CKnownEntity *	SelectMoreDangerousThreat( const INextBot *me, 
+															   const CBaseCombatCharacter *subject,		// the subject of the danger
+															   const CKnownEntity *threat1, 
+															   const CKnownEntity *threat2 ) const;	// return the more dangerous of the two threats, or NULL if we have no opinion
+	// NOTE: As further queries are added, update the Behavior class to propagate them
+};
+
+
+inline QueryResultType IIntention::ShouldPickUp( const INextBot *me, CBaseEntity *item ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			QueryResultType result = query->ShouldPickUp( me, item );
+			if ( result != ANSWER_UNDEFINED )
+			{
+				return result;
+			}
+		}
+	}	
+	return ANSWER_UNDEFINED;
+}
+
+
+inline QueryResultType IIntention::ShouldHurry( const INextBot *me ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			QueryResultType result = query->ShouldHurry( me );
+			if ( result != ANSWER_UNDEFINED )
+			{
+				return result;
+			}
+		}
+	}	
+	return ANSWER_UNDEFINED;
+}
+
+
+inline QueryResultType IIntention::ShouldRetreat( const INextBot *me ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			QueryResultType result = query->ShouldRetreat( me );
+			if ( result != ANSWER_UNDEFINED )
+			{
+				return result;
+			}
+		}
+	}	
+	return ANSWER_UNDEFINED;
+}
+
+
+inline QueryResultType IIntention::ShouldAttack( const INextBot *me, const CKnownEntity *them ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			QueryResultType result = query->ShouldAttack( me, them );
+			if ( result != ANSWER_UNDEFINED )
+			{
+				return result;
+			}
+		}
+	}	
+	return ANSWER_UNDEFINED;
+}
+
+
+inline QueryResultType IIntention::IsHindrance( const INextBot *me, CBaseEntity *blocker ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			QueryResultType result = query->IsHindrance( me, blocker );
+			if ( result != ANSWER_UNDEFINED )
+			{
+				return result;
+			}
+		}
+	}	
+	return ANSWER_UNDEFINED;
+}
+
+
+inline QueryResultType IIntention::IsPositionAllowed( const INextBot *me, const Vector &pos ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			QueryResultType result = query->IsPositionAllowed( me, pos );
+			if ( result != ANSWER_UNDEFINED )
+			{
+				return result;
+			}
+		}
+	}	
+	return ANSWER_UNDEFINED;
+}
+
+
+#endif // _NEXT_BOT_INTENTION_INTERFACE_H_

game/server/NextBot/NextBotInterface.cpp

@@ -0,0 +1,537 @@
+// NextBotInterface.cpp
+// Implentation of system methods for NextBot interface
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "props.h"
+#include "fmtstr.h"
+#include "team.h"
+
+#include "NextBotInterface.h"
+#include "NextBotBodyInterface.h"
+#include "NextBotManager.h"
+
+#include "tier0/vprof.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// development only, off by default for 360
+ConVar NextBotDebugHistory( "nb_debug_history", IsX360() ? "0" : "1", FCVAR_CHEAT, "If true, each bot keeps a history of debug output in memory" );
+
+//----------------------------------------------------------------------------------------------------------------
+INextBot::INextBot( void ) : m_debugHistory( MAX_NEXTBOT_DEBUG_HISTORY, 0 )	// CUtlVector: grow to max length, alloc 0 initially
+{
+	m_tickLastUpdate = -999;
+	m_id = -1;
+	m_componentList = NULL;
+	m_debugDisplayLine = 0;
+
+	m_immobileTimer.Invalidate();
+	m_immobileCheckTimer.Invalidate();
+	m_immobileAnchor = vec3_origin;
+
+	m_currentPath = NULL;
+
+	// register with the manager
+	m_id = TheNextBots().Register( this );
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+INextBot::~INextBot()
+{
+	ResetDebugHistory();
+
+	// tell the manager we're gone
+	TheNextBots().UnRegister( this );
+
+	// delete Intention first, since destruction of Actions may access other components
+	if ( m_baseIntention )
+		delete m_baseIntention;
+
+	if ( m_baseLocomotion )
+		delete m_baseLocomotion;
+
+	if ( m_baseBody )
+		delete m_baseBody;
+
+	if ( m_baseVision )
+		delete m_baseVision;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+void INextBot::Reset( void )
+{
+	m_tickLastUpdate = -999;
+	m_debugType = 0;
+	m_debugDisplayLine = 0;
+
+	m_immobileTimer.Invalidate();
+	m_immobileCheckTimer.Invalidate();
+	m_immobileAnchor = vec3_origin;
+
+	for( INextBotComponent *comp = m_componentList; comp; comp = comp->m_nextComponent )
+	{
+		comp->Reset();
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+void INextBot::ResetDebugHistory( void )
+{
+	for ( int i=0; i<m_debugHistory.Count(); ++i )
+	{
+		delete m_debugHistory[i];
+	}
+
+	m_debugHistory.RemoveAll();
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::BeginUpdate()
+{
+	if ( TheNextBots().ShouldUpdate( this ) )
+	{
+		TheNextBots().NotifyBeginUpdate( this );
+		return true;
+	}
+	return false;
+}
+
+//----------------------------------------------------------------------------------------------------------------
+void INextBot::EndUpdate( void )
+{
+	TheNextBots().NotifyEndUpdate( this );
+}
+
+//----------------------------------------------------------------------------------------------------------------
+void INextBot::Update( void )
+{
+	VPROF_BUDGET( "INextBot::Update", "NextBot" );
+
+	m_debugDisplayLine = 0;
+
+	if ( IsDebugging( NEXTBOT_DEBUG_ALL ) )
+	{
+		CFmtStr msg;
+		DisplayDebugText( msg.sprintf( "#%d", GetEntity()->entindex() ) );
+	}
+
+	UpdateImmobileStatus();
+
+	// update all components
+	for( INextBotComponent *comp = m_componentList; comp; comp = comp->m_nextComponent )
+	{
+		if ( comp->ComputeUpdateInterval() )
+		{
+			comp->Update();
+		}
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+void INextBot::Upkeep( void )
+{
+	VPROF_BUDGET( "INextBot::Upkeep", "NextBot" );
+
+	// do upkeep for all components
+	for( INextBotComponent *comp = m_componentList; comp; comp = comp->m_nextComponent )
+	{
+		comp->Upkeep();
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::SetPosition( const Vector &pos )
+{
+	IBody *body = GetBodyInterface();
+	if (body)
+	{
+		return body->SetPosition( pos );
+	}
+	
+	// fall back to setting raw entity position
+	GetEntity()->SetAbsOrigin( pos );
+	return true;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+const Vector &INextBot::GetPosition( void ) const
+{
+	return const_cast< INextBot * >( this )->GetEntity()->GetAbsOrigin();
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Return true if given actor is our enemy
+ */
+bool INextBot::IsEnemy( const CBaseEntity *them ) const
+{
+	if ( them == NULL )
+		return false;
+		
+	// this is not strictly correct, as spectators are not enemies
+	return const_cast< INextBot * >( this )->GetEntity()->GetTeamNumber() != them->GetTeamNumber();
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Return true if given actor is our friend
+ */
+bool INextBot::IsFriend( const CBaseEntity  *them ) const
+{
+	if ( them == NULL )
+		return false;
+		
+	return const_cast< INextBot * >( this )->GetEntity()->GetTeamNumber() == them->GetTeamNumber();
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Return true if 'them' is actually me
+ */
+bool INextBot::IsSelf( const CBaseEntity *them ) const
+{
+	if ( them == NULL )
+		return false;
+
+	return const_cast< INextBot * >( this )->GetEntity()->entindex() == them->entindex();
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Components call this to register themselves with the bot that contains them
+ */
+void INextBot::RegisterComponent( INextBotComponent *comp )
+{
+	// add to head of singly linked list
+	comp->m_nextComponent = m_componentList;
+	m_componentList = comp;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::IsRangeLessThan( CBaseEntity *subject, float range ) const
+{
+	Vector botPos;
+	CBaseEntity *bot = const_cast< INextBot * >( this )->GetEntity();
+	if ( !bot || !subject )
+		return 0.0f;
+
+	bot->CollisionProp()->CalcNearestPoint( subject->WorldSpaceCenter(), &botPos );
+	float computedRange = subject->CollisionProp()->CalcDistanceFromPoint( botPos );
+	return computedRange < range;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::IsRangeLessThan( const Vector &pos, float range ) const
+{
+	Vector to = pos - GetPosition();
+	return to.IsLengthLessThan( range );
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::IsRangeGreaterThan( CBaseEntity *subject, float range ) const
+{
+	Vector botPos;
+	CBaseEntity *bot = const_cast< INextBot * >( this )->GetEntity();
+	if ( !bot || !subject )
+		return true;
+
+	bot->CollisionProp()->CalcNearestPoint( subject->WorldSpaceCenter(), &botPos );
+	float computedRange = subject->CollisionProp()->CalcDistanceFromPoint( botPos );
+	return computedRange > range;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::IsRangeGreaterThan( const Vector &pos, float range ) const
+{
+	Vector to = pos - GetPosition();
+	return to.IsLengthGreaterThan( range );
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+float INextBot::GetRangeTo( CBaseEntity *subject ) const
+{
+	Vector botPos;
+	CBaseEntity *bot = const_cast< INextBot * >( this )->GetEntity();
+	if ( !bot || !subject )
+		return 0.0f;
+
+	bot->CollisionProp()->CalcNearestPoint( subject->WorldSpaceCenter(), &botPos );
+	float computedRange = subject->CollisionProp()->CalcDistanceFromPoint( botPos );
+	return computedRange;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+float INextBot::GetRangeTo( const Vector &pos ) const
+{
+	Vector to = pos - GetPosition();
+	return to.Length();
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+float INextBot::GetRangeSquaredTo( CBaseEntity *subject ) const
+{
+	Vector botPos;
+	CBaseEntity *bot = const_cast< INextBot * >( this )->GetEntity();
+	if ( !bot || !subject )
+		return 0.0f;
+
+	bot->CollisionProp()->CalcNearestPoint( subject->WorldSpaceCenter(), &botPos );
+	float computedRange = subject->CollisionProp()->CalcDistanceFromPoint( botPos );
+	return computedRange * computedRange;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+float INextBot::GetRangeSquaredTo( const Vector &pos ) const
+{
+	Vector to = pos - GetPosition();
+	return to.LengthSqr();	
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+bool INextBot::IsDebugging( unsigned int type ) const
+{
+	if ( TheNextBots().IsDebugging( type ) )
+	{
+		return TheNextBots().IsDebugFilterMatch( this );
+	}
+
+	return false;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Return the name of this bot for debugging purposes
+ */
+const char *INextBot::GetDebugIdentifier( void ) const
+{
+	const int nameSize = 256;
+	static char name[ nameSize ];
+	
+	Q_snprintf( name, nameSize, "%s(#%d)", const_cast< INextBot * >( this )->GetEntity()->GetClassname(), const_cast< INextBot * >( this )->GetEntity()->entindex() );
+
+	return name;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Return true if we match the given debug symbol
+ */
+bool INextBot::IsDebugFilterMatch( const char *name ) const
+{
+	// compare debug identifier
+	if ( !Q_strnicmp( name, GetDebugIdentifier(), Q_strlen( name ) ) )
+	{
+		return true;
+	}
+
+	// compare team name
+	CTeam *team = GetEntity()->GetTeam();
+	if ( team && !Q_strnicmp( name, team->GetName(), Q_strlen( name ) ) )
+	{
+		return true;
+	}
+
+
+	return false;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * There are some things we never want to climb on
+ */
+bool INextBot::IsAbleToClimbOnto( const CBaseEntity *object ) const
+{
+	if ( object == NULL || !const_cast<CBaseEntity *>(object)->IsAIWalkable() )
+	{
+		return false;
+	}
+
+	// never climb onto doors
+	if ( FClassnameIs( const_cast< CBaseEntity * >( object ), "prop_door*" ) || FClassnameIs( const_cast< CBaseEntity * >( object ), "func_door*" ) )
+	{
+		return false;
+	}
+
+	// ok to climb on this object
+	return true;
+}
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * Can we break this object
+ */
+bool INextBot::IsAbleToBreak( const CBaseEntity *object ) const
+{
+	if ( object && object->m_takedamage == DAMAGE_YES )
+	{
+		if ( FClassnameIs( const_cast< CBaseEntity * >( object ), "func_breakable" ) && 
+			 object->GetHealth() )
+		{
+			return true;
+		}
+
+		if ( FClassnameIs( const_cast< CBaseEntity * >( object ), "func_breakable_surf" ) )
+		{
+			return true;
+		}
+
+		if ( dynamic_cast< const CBreakableProp * >( object ) != NULL )
+		{
+			return true;
+		}
+	}
+
+	return false;
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+void INextBot::DisplayDebugText( const char *text ) const
+{
+	const_cast< INextBot * >( this )->GetEntity()->EntityText( m_debugDisplayLine++, text, 0.1 );
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+void INextBot::DebugConColorMsg( NextBotDebugType debugType, const Color &color, const char *fmt, ... )
+{
+	bool isDataFormatted = false;
+
+	va_list argptr;
+	char data[ MAX_NEXTBOT_DEBUG_LINE_LENGTH ];
+
+	if ( developer.GetBool() && IsDebugging( debugType ) )
+	{
+		va_start(argptr, fmt);
+		Q_vsnprintf(data, sizeof( data ), fmt, argptr);
+		va_end(argptr);
+		isDataFormatted = true;
+
+		ConColorMsg( color, "%s", data );
+	}
+
+	if ( !NextBotDebugHistory.GetBool() )
+	{
+		if ( m_debugHistory.Count() )
+		{
+			ResetDebugHistory();
+		}
+		return;
+	}
+
+	// Don't bother with event data - it's spammy enough to overshadow everything else.
+	if ( debugType == NEXTBOT_EVENTS )
+		return;
+
+	if ( !isDataFormatted )
+	{
+		va_start(argptr, fmt);
+		Q_vsnprintf(data, sizeof( data ), fmt, argptr);
+		va_end(argptr);
+		isDataFormatted = true;
+	}
+
+	int lastLine = m_debugHistory.Count() - 1;
+	if ( lastLine >= 0 )
+	{
+		NextBotDebugLineType *line = m_debugHistory[lastLine];
+		if ( line->debugType == debugType && V_strstr( line->data, "\n" ) == NULL )
+		{
+			// append onto previous line
+			V_strncat( line->data, data, MAX_NEXTBOT_DEBUG_LINE_LENGTH );
+			return;
+		}
+	}
+
+	// Prune out an old line if needed, keeping a pointer to re-use the memory
+	NextBotDebugLineType *line = NULL;
+	if ( m_debugHistory.Count() == MAX_NEXTBOT_DEBUG_HISTORY )
+	{
+		line = m_debugHistory[0];
+		m_debugHistory.Remove( 0 );
+	}
+
+	// Add to debug history
+	if ( !line )
+	{
+		line = new NextBotDebugLineType;
+	}
+	line->debugType = debugType;
+	V_strncpy( line->data, data, MAX_NEXTBOT_DEBUG_LINE_LENGTH );
+	m_debugHistory.AddToTail( line );
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+// build a vector of debug history of the given types
+void INextBot::GetDebugHistory( unsigned int type, CUtlVector< const NextBotDebugLineType * > *lines ) const
+{
+	if ( !lines )
+		return;
+
+	lines->RemoveAll();
+
+	for ( int i=0; i<m_debugHistory.Count(); ++i )
+	{
+		NextBotDebugLineType *line = m_debugHistory[i];
+		if ( line->debugType & type )
+		{
+			lines->AddToTail( line );
+		}
+	}
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+void INextBot::UpdateImmobileStatus( void )
+{
+	if ( m_immobileCheckTimer.IsElapsed() )
+	{
+		m_immobileCheckTimer.Start( 1.0f );
+
+		// if we haven't moved farther than this in 1 second, we're immobile
+		if ( ( GetEntity()->GetAbsOrigin() - m_immobileAnchor ).IsLengthGreaterThan( GetImmobileSpeedThreshold() ) )
+		{
+			// moved far enough, not immobile
+			m_immobileAnchor = GetEntity()->GetAbsOrigin();
+			m_immobileTimer.Invalidate();
+		}
+		else
+		{
+			// haven't escaped our anchor - we are immobile
+			if ( !m_immobileTimer.HasStarted() )
+			{
+				m_immobileTimer.Start();
+			}
+		}
+	}
+}
+

game/server/NextBot/NextBotInterface.h

@@ -0,0 +1,302 @@
+// NextBotInterface.h
+// Interface for NextBot
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_INTERFACE_H_
+#define _NEXT_BOT_INTERFACE_H_
+
+#include "NextBot/NextBotKnownEntity.h"
+#include "NextBotComponentInterface.h"
+#include "NextBotLocomotionInterface.h"
+#include "NextBotBodyInterface.h"
+#include "NextBotIntentionInterface.h"
+#include "NextBotVisionInterface.h"
+#include "NextBotDebug.h"
+
+class CBaseCombatCharacter;
+class PathFollower;
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * A general purpose filter interface for various bot systems
+ */
+class INextBotFilter
+{
+public:
+	virtual bool IsSelected( const CBaseEntity *candidate ) const = 0;			// return true if this entity passes the filter
+};
+
+
+//----------------------------------------------------------------------------------------------------------------
+class INextBot : public INextBotEventResponder
+{
+public:
+	INextBot( void );
+	virtual ~INextBot();
+
+	int GetBotId() const;
+
+	bool BeginUpdate();
+	void EndUpdate();
+
+	virtual void Reset( void );										// (EXTEND) reset to initial state
+	virtual void Update( void );									// (EXTEND) update internal state
+	virtual void Upkeep( void );									// (EXTEND) lightweight update guaranteed to occur every server tick
+
+	void FlagForUpdate( bool b = true );
+	bool IsFlaggedForUpdate();
+	int GetTickLastUpdate() const;
+	void SetTickLastUpdate( int );
+
+	virtual bool IsRemovedOnReset( void ) const { return true; }	// remove this bot when the NextBot manager calls Reset
+
+	virtual CBaseCombatCharacter *GetEntity( void ) const	= 0;
+	virtual class NextBotCombatCharacter *GetNextBotCombatCharacter( void ) const	{ return NULL; }
+
+#ifdef TERROR
+	virtual class SurvivorBot *MySurvivorBotPointer() const { return NULL; }
+#endif
+
+	// interfaces are never NULL - return base no-op interfaces at a minimum
+	virtual ILocomotion *	GetLocomotionInterface( void ) const;
+	virtual IBody *			GetBodyInterface( void ) const;
+	virtual IIntention *	GetIntentionInterface( void ) const;
+	virtual IVision *		GetVisionInterface( void ) const;
+
+	/**
+	 * Attempt to change the bot's position. Return true if successful.
+	 */
+	virtual bool SetPosition( const Vector &pos );
+	virtual const Vector &GetPosition( void ) const;				// get the global position of the bot
+
+	/**
+	 * Friend/enemy/neutral queries
+	 */
+	virtual bool IsEnemy( const CBaseEntity *them ) const;			// return true if given entity is our enemy
+	virtual bool IsFriend( const CBaseEntity *them ) const;			// return true if given entity is our friend
+	virtual bool IsSelf( const CBaseEntity *them ) const;			// return true if 'them' is actually me
+
+	/**
+	 * Can we climb onto this entity?
+	 */	
+	virtual bool IsAbleToClimbOnto( const CBaseEntity *object ) const;
+
+	/**
+	 * Can we break this entity?
+	 */	
+	virtual bool IsAbleToBreak( const CBaseEntity *object ) const;
+
+	/**
+	 * Sometimes we want to pass through other NextBots. OnContact() will always
+	 * be invoked, but collision resolution can be skipped if this
+	 * method returns false.
+	 */
+	virtual bool IsAbleToBlockMovementOf( const INextBot *botInMotion ) const	{ return true; }
+
+	/**
+	 * Should we ever care about noticing physical contact with this entity?
+	 */
+	virtual bool ShouldTouch( const CBaseEntity *object ) const		{ return true; }
+
+	/**
+	 * This immobile system is used to track the global state of "am I actually moving or not".
+	 * The OnStuck() event is only emitted when following a path, and paths can be recomputed, etc.
+	 */
+	virtual bool IsImmobile( void ) const;					// return true if we haven't moved in awhile
+	virtual float GetImmobileDuration( void ) const;		// how long have we been immobile
+	virtual void ClearImmobileStatus( void );		
+	virtual float GetImmobileSpeedThreshold( void ) const;	// return units/second below which this actor is considered "immobile"
+
+	/**
+	 * Get the last PathFollower we followed. This method gives other interfaces a
+	 * single accessor to the most recent Path being followed by the myriad of 
+	 * different PathFollowers used in the various behaviors the bot may be doing.
+	 */
+	virtual const PathFollower *GetCurrentPath( void ) const;
+	virtual void SetCurrentPath( const PathFollower *path );
+	virtual void NotifyPathDestruction( const PathFollower *path );		// this PathFollower is going away, which may or may not be ours
+
+	// between distance utility methods
+	virtual bool IsRangeLessThan( CBaseEntity *subject, float range ) const;
+	virtual bool IsRangeLessThan( const Vector &pos, float range ) const;
+	virtual bool IsRangeGreaterThan( CBaseEntity *subject, float range ) const;
+	virtual bool IsRangeGreaterThan( const Vector &pos, float range ) const;
+	virtual float GetRangeTo( CBaseEntity *subject ) const;
+	virtual float GetRangeTo( const Vector &pos ) const;
+	virtual float GetRangeSquaredTo( CBaseEntity *subject ) const;
+	virtual float GetRangeSquaredTo( const Vector &pos ) const;
+
+	// event propagation
+	virtual INextBotEventResponder *FirstContainedResponder( void ) const;
+	virtual INextBotEventResponder *NextContainedResponder( INextBotEventResponder *current ) const;
+
+	virtual bool IsDebugging( unsigned int type ) const;		// return true if this bot is debugging any of the given types
+	virtual const char *GetDebugIdentifier( void ) const;		// return the name of this bot for debugging purposes
+	virtual bool IsDebugFilterMatch( const char *name ) const;	// return true if we match the given debug symbol
+	virtual void DisplayDebugText( const char *text ) const;	// show a line of text on the bot in the world
+	void DebugConColorMsg( NextBotDebugType debugType, const Color &color, PRINTF_FORMAT_STRING const char *fmt, ... );
+
+	enum {
+		MAX_NEXTBOT_DEBUG_HISTORY = 100,
+		MAX_NEXTBOT_DEBUG_LINE_LENGTH = 256,
+	};
+	struct NextBotDebugLineType
+	{
+		NextBotDebugType debugType;
+		char data[ MAX_NEXTBOT_DEBUG_LINE_LENGTH ];
+	};
+	void GetDebugHistory( unsigned int type, CUtlVector< const NextBotDebugLineType * > *lines ) const;	// build a vector of debug history of the given types
+	//------------------------------------------------------------------------------
+
+
+private:
+	friend class INextBotComponent;
+	void RegisterComponent( INextBotComponent *comp );		// components call this to register themselves with the bot that contains them
+	INextBotComponent *m_componentList;						// the first component
+
+	const PathFollower *m_currentPath;						// the path we most recently followed
+
+	int m_id;
+	bool m_bFlaggedForUpdate;
+	int m_tickLastUpdate;
+
+	unsigned int m_debugType;
+	mutable int m_debugDisplayLine;
+
+	Vector m_immobileAnchor;
+	CountdownTimer m_immobileCheckTimer;
+	IntervalTimer m_immobileTimer;
+	void UpdateImmobileStatus( void );
+
+	mutable ILocomotion *m_baseLocomotion;
+	mutable IBody		*m_baseBody;
+	mutable IIntention	*m_baseIntention;
+	mutable IVision		*m_baseVision;
+	//mutable IAttention	*m_baseAttention;
+
+	// Debugging info
+	void ResetDebugHistory( void );
+	CUtlVector< NextBotDebugLineType * > m_debugHistory;
+};
+
+
+inline const PathFollower *INextBot::GetCurrentPath( void ) const
+{
+	return m_currentPath;
+}
+
+inline void INextBot::SetCurrentPath( const PathFollower *path )
+{
+	m_currentPath = path;
+}
+
+inline void INextBot::NotifyPathDestruction( const PathFollower *path )
+{
+	if ( m_currentPath == path )
+		m_currentPath = NULL;
+}
+
+
+inline ILocomotion *INextBot::GetLocomotionInterface( void ) const
+{
+	// these base interfaces are lazy-allocated (instead of being fully instanced classes) for two reasons:
+	// 1) so the memory is only used if needed
+	// 2) so the component is registered properly
+	if ( m_baseLocomotion == NULL )
+	{
+		m_baseLocomotion = new ILocomotion( const_cast< INextBot * >( this ) );
+	}
+
+	return m_baseLocomotion;
+}
+
+inline IBody *INextBot::GetBodyInterface( void ) const
+{
+	if ( m_baseBody == NULL )
+	{
+		m_baseBody = new IBody( const_cast< INextBot * >( this ) );
+	}
+
+	return m_baseBody;
+}
+
+inline IIntention *INextBot::GetIntentionInterface( void ) const
+{
+	if ( m_baseIntention == NULL )
+	{
+		m_baseIntention = new IIntention( const_cast< INextBot * >( this ) );
+	}
+
+	return m_baseIntention;
+}
+
+inline IVision *INextBot::GetVisionInterface( void ) const
+{
+	if ( m_baseVision == NULL )
+	{
+		m_baseVision = new IVision( const_cast< INextBot * >( this ) );
+	}
+
+	return m_baseVision;
+}
+
+inline int INextBot::GetBotId() const
+{
+	return m_id;
+}
+
+inline void INextBot::FlagForUpdate( bool b )
+{
+	m_bFlaggedForUpdate = b;
+}
+
+inline bool INextBot::IsFlaggedForUpdate()
+{
+	return m_bFlaggedForUpdate;
+}
+
+inline int INextBot::GetTickLastUpdate() const
+{
+	return m_tickLastUpdate;
+}
+
+inline void INextBot::SetTickLastUpdate( int tick )
+{
+	m_tickLastUpdate = tick;
+}
+
+inline bool INextBot::IsImmobile( void ) const
+{
+	return m_immobileTimer.HasStarted();
+}
+
+inline float INextBot::GetImmobileDuration( void ) const
+{
+	return m_immobileTimer.GetElapsedTime();
+}
+
+inline void INextBot::ClearImmobileStatus( void )
+{
+	m_immobileTimer.Invalidate();
+	m_immobileAnchor = GetEntity()->GetAbsOrigin();
+}
+
+inline float INextBot::GetImmobileSpeedThreshold( void ) const
+{
+	return 30.0f;
+}
+
+inline INextBotEventResponder *INextBot::FirstContainedResponder( void ) const
+{
+	return m_componentList;
+}
+
+
+inline INextBotEventResponder *INextBot::NextContainedResponder( INextBotEventResponder *current ) const
+{
+	return static_cast< INextBotComponent * >( current )->m_nextComponent;
+}
+
+
+#endif // _NEXT_BOT_INTERFACE_H_

game/server/NextBot/NextBotKnownEntity.h

@@ -0,0 +1,175 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+// NextBotKnownEntity.h
+// Encapsulation of being aware of an entity
+// Author: Michael Booth, June 2009
+
+#ifndef NEXT_BOT_KNOWN_ENTITY_H
+#define NEXT_BOT_KNOWN_ENTITY_H
+
+//----------------------------------------------------------------------------
+/**
+ * A "known entity" is an entity that we have seen or heard at some point
+ * and which may or may not be immediately visible to us right now but which
+ * we remember the last place we encountered it, and when.
+ *
+ * TODO: Enhance interface to allow for sets of areas where an unseen entity 
+ * could potentially be, knowing his last position and his rate of movement.
+ */
+class CKnownEntity
+{
+public:
+	// constructing assumes we currently know about this entity
+	CKnownEntity( CBaseEntity *who )
+	{
+		m_who = who;
+		m_whenLastSeen = -1.0f;
+		m_whenLastBecameVisible = -1.0f;
+		m_isVisible = false;
+		m_whenBecameKnown = gpGlobals->curtime;
+		m_hasLastKnownPositionBeenSeen = false;
+		UpdatePosition();
+	}
+
+	virtual ~CKnownEntity() { }
+
+	virtual void Destroy( void )
+	{
+		m_who = NULL;
+		m_isVisible = false;
+	}
+
+	virtual void UpdatePosition( void )		// could be seen or heard, but now the entity's position is known
+	{
+		if ( m_who.Get() )
+		{
+			m_lastKnownPostion = m_who->GetAbsOrigin();
+			m_lastKnownArea = m_who->MyCombatCharacterPointer() ? m_who->MyCombatCharacterPointer()->GetLastKnownArea() : NULL;
+			m_whenLastKnown = gpGlobals->curtime;
+		}
+	}
+
+	virtual CBaseEntity *GetEntity( void ) const
+	{
+		return m_who;
+	}
+
+	virtual const Vector &GetLastKnownPosition( void ) const
+	{
+		return m_lastKnownPostion;
+	}
+
+	// Have we had a clear view of the last known position of this entity?
+	// This encapsulates the idea of "I just saw a guy right over *there* a few seconds ago, but I don't know where he is now"
+	virtual bool HasLastKnownPositionBeenSeen( void ) const
+	{
+		return m_hasLastKnownPositionBeenSeen;
+	}
+
+	virtual void MarkLastKnownPositionAsSeen( void )
+	{
+		m_hasLastKnownPositionBeenSeen = true;
+	}
+
+	virtual const CNavArea *GetLastKnownArea( void ) const
+	{
+		return m_lastKnownArea;
+	}
+
+	virtual float GetTimeSinceLastKnown( void ) const
+	{
+		return gpGlobals->curtime - m_whenLastKnown;
+	}
+
+	virtual float GetTimeSinceBecameKnown( void ) const
+	{
+		return gpGlobals->curtime - m_whenBecameKnown;
+	}
+
+	virtual void UpdateVisibilityStatus( bool visible )
+	{
+		if ( visible )
+		{
+			if ( !m_isVisible )
+			{
+				// just became visible
+				m_whenLastBecameVisible = gpGlobals->curtime;
+			}
+
+			m_whenLastSeen = gpGlobals->curtime;
+		}
+
+		m_isVisible = visible;
+	}
+
+	virtual bool IsVisibleInFOVNow( void ) const	// return true if this entity is currently visible and in my field of view
+	{
+		return m_isVisible;
+	}
+
+	virtual bool IsVisibleRecently( void ) const	// return true if this entity is visible or was very recently visible
+	{
+		if ( m_isVisible )
+			return true;
+
+		if ( WasEverVisible() && GetTimeSinceLastSeen() < 3.0f )
+			return true;
+
+		return false;
+	}
+
+	virtual float GetTimeSinceBecameVisible( void ) const
+	{
+		return gpGlobals->curtime - m_whenLastBecameVisible;
+	}
+
+	virtual float GetTimeWhenBecameVisible( void ) const
+	{
+		return m_whenLastBecameVisible;
+	}
+
+	virtual float GetTimeSinceLastSeen( void ) const
+	{
+		return gpGlobals->curtime - m_whenLastSeen;
+	}
+
+	virtual bool WasEverVisible( void ) const
+	{
+		return m_whenLastSeen > 0.0f;
+	}
+
+	// has our knowledge of this entity become obsolete?
+	virtual bool IsObsolete( void ) const
+	{
+		return GetEntity() == NULL || !m_who->IsAlive() || GetTimeSinceLastKnown() > 10.0f;
+	}
+
+	virtual bool operator==( const CKnownEntity &other ) const
+	{
+		if ( GetEntity() == NULL || other.GetEntity() == NULL )
+			return false;
+
+		return ( GetEntity() == other.GetEntity() );
+	}
+
+	virtual bool Is( CBaseEntity *who ) const
+	{
+		if ( GetEntity() == NULL || who == NULL )
+			return false;
+
+		return ( GetEntity() == who );
+	}
+
+private:
+	CHandle< CBaseEntity > m_who;
+	Vector m_lastKnownPostion;
+	bool m_hasLastKnownPositionBeenSeen;
+	CNavArea *m_lastKnownArea;
+	float m_whenLastSeen;
+	float m_whenLastBecameVisible;
+	float m_whenLastKnown;			// last seen or heard, confirming its existance
+	float m_whenBecameKnown;
+	bool m_isVisible;				// flagged by IVision update as visible or not
+};
+
+
+#endif // NEXT_BOT_KNOWN_ENTITY_H

game/server/NextBot/NextBotLocomotionInterface.cpp

@@ -0,0 +1,520 @@
+// NextBotLocomotionInterface.cpp
+// Common functionality for all NextBot locomotors
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "BasePropDoor.h"
+
+#include "nav_area.h"
+#include "NextBot.h"
+#include "NextBotUtil.h"
+#include "NextBotLocomotionInterface.h"
+#include "NextBotBodyInterface.h"
+
+#include "tier0/vprof.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// how far a bot must move to not be considered "stuck"
+#define STUCK_RADIUS 100.0f
+
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Reset to initial state
+ */
+ILocomotion::ILocomotion( INextBot *bot ) : INextBotComponent( bot )
+{
+	Reset();
+}
+
+ILocomotion::~ILocomotion()
+{
+}
+
+void ILocomotion::Reset( void )
+{
+	INextBotComponent::Reset();
+
+	m_motionVector = Vector( 1.0f, 0.0f, 0.0f );
+	m_speed = 0.0f;
+	m_groundMotionVector = m_motionVector;
+	m_groundSpeed = m_speed;
+
+	m_moveRequestTimer.Invalidate();
+
+	m_isStuck = false;
+	m_stuckTimer.Invalidate();
+	m_stuckPos = vec3_origin;
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Update internal state
+ */
+void ILocomotion::Update( void )
+{
+	StuckMonitor();
+
+	// maintain motion vector and speed values
+	const Vector &vel = GetVelocity();
+	m_speed = vel.Length();
+	m_groundSpeed = vel.AsVector2D().Length();
+
+	const float velocityThreshold = 10.0f;
+	if ( m_speed > velocityThreshold )
+	{
+		m_motionVector = vel / m_speed;
+	}
+
+	if ( m_groundSpeed > velocityThreshold )
+	{
+		m_groundMotionVector.x = vel.x / m_groundSpeed;
+		m_groundMotionVector.y = vel.y / m_groundSpeed;
+		m_groundMotionVector.z = 0.0f;
+	}
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		// show motion vector
+		NDebugOverlay::HorzArrow( GetFeet(), GetFeet() + 25.0f * m_groundMotionVector, 3.0f, 100, 255, 0, 255, true, 0.1f );
+		NDebugOverlay::HorzArrow( GetFeet(), GetFeet() + 25.0f * m_motionVector, 5.0f, 255, 255, 0, 255, true, 0.1f );
+	}
+}
+
+
+//----------------------------------------------------------------------------
+void ILocomotion::AdjustPosture( const Vector &moveGoal )
+{
+	// This function has no effect if we're not standing or crouching
+	IBody *body = GetBot()->GetBodyInterface();
+	if ( !body->IsActualPosture( IBody::STAND ) && !body->IsActualPosture( IBody::CROUCH ) )
+		return;
+
+	//
+	// Stand or crouch as needed
+	//
+
+	// get bounding limits, ignoring step-upable height
+	const Vector &mins = body->GetHullMins() + Vector( 0, 0, GetStepHeight() );
+
+	const float halfSize = body->GetHullWidth()/2.0f;
+	Vector standMaxs( halfSize, halfSize, body->GetStandHullHeight() );
+
+	trace_t trace;
+	NextBotTraversableTraceFilter filter( GetBot(), ILocomotion::IMMEDIATELY );
+
+	// snap forward movement vector along floor
+	const Vector &groundNormal = GetGroundNormal();
+	const Vector &feet = GetFeet();
+	Vector moveDir = moveGoal - feet;
+	float moveLength = moveDir.NormalizeInPlace();
+	Vector left( -moveDir.y, moveDir.x, 0.0f );
+	Vector goal = feet + moveLength * CrossProduct( left, groundNormal ).Normalized();
+
+	TraceHull( feet, goal, mins, standMaxs, body->GetSolidMask(), &filter, &trace );
+
+	if ( trace.fraction >= 1.0f && !trace.startsolid )
+	{
+		// no collision while standing
+		if ( body->IsActualPosture( IBody::CROUCH ) )
+		{
+			body->SetDesiredPosture( IBody::STAND );
+		}
+		return;
+	}
+
+	if ( body->IsActualPosture( IBody::CROUCH ) )
+		return;
+
+	// crouch hull check
+	Vector crouchMaxs( halfSize, halfSize, body->GetCrouchHullHeight() );
+
+	TraceHull( feet, goal, mins, crouchMaxs, body->GetSolidMask(), &filter, &trace );
+
+	if ( trace.fraction >= 1.0f && !trace.startsolid )
+	{
+		// no collision while crouching
+		body->SetDesiredPosture( IBody::CROUCH );
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Move directly towards the given position
+ */
+void ILocomotion::Approach( const Vector &goalPos, float goalWeight )
+{
+	// there is a desire to move
+	m_moveRequestTimer.Start();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Move the bot to the precise given position immediately
+ */
+void ILocomotion::DriveTo( const Vector &pos )
+{
+	// there is a desire to move
+	m_moveRequestTimer.Start();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Return true if this locomotor could potentially move along the line given.
+ * If false is returned, fraction of walkable ray is returned in 'fraction'
+ */
+bool ILocomotion::IsPotentiallyTraversable( const Vector &from, const Vector &to, TraverseWhenType when, float *fraction ) const
+{
+	VPROF_BUDGET( "Locomotion::IsPotentiallyTraversable", "NextBotExpensive" );
+
+	// if 'to' is high above us, it's not directly traversable
+	// Adding a bit of fudge room to allow for floating point roundoff errors
+	if ( ( to.z - from.z ) > GetMaxJumpHeight() + 0.1f )
+	{
+		Vector along = to - from;
+		along.NormalizeInPlace();
+		if ( along.z > GetTraversableSlopeLimit() )
+		{
+			if ( fraction )
+			{
+				*fraction = 0.0f;
+			}
+			return false;
+		}
+	}
+
+	trace_t result;
+	NextBotTraversableTraceFilter filter( GetBot(), when );
+
+	// use a small hull since we cannot simulate collision resolution and avoidance along the way
+	const float probeSize = 0.25f * GetBot()->GetBodyInterface()->GetHullWidth(); // Cant be TOO small, or open stairwells/grates/etc will cause problems
+	const float probeZ = GetStepHeight();
+
+	Vector hullMin( -probeSize, -probeSize, probeZ );
+	Vector hullMax( probeSize, probeSize, GetBot()->GetBodyInterface()->GetCrouchHullHeight() );
+	TraceHull( from, to, hullMin, hullMax, GetBot()->GetBodyInterface()->GetSolidMask(), &filter, &result );
+
+/*
+	if ( result.DidHit() )
+	{
+		NDebugOverlay::SweptBox( from, result.endpos, hullMin, hullMax, vec3_angle, 255, 0, 0, 255, 9999.9f );
+		NDebugOverlay::SweptBox( result.endpos, to, hullMin, hullMax, vec3_angle, 255, 255, 0, 255, 9999.9f );
+	}
+	else
+	{
+		NDebugOverlay::SweptBox( from, to, hullMin, hullMax, vec3_angle, 255, 255, 0, 255, 0.1f );
+	}
+*/
+
+	if ( fraction )
+	{
+		*fraction = result.fraction;
+	}
+
+	return ( result.fraction >= 1.0f ) && ( !result.startsolid );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Return true if there is a possible "gap" that will need to be jumped over
+ * If true is returned, fraction of ray before gap is returned in 'fraction'
+ */
+bool ILocomotion::HasPotentialGap( const Vector &from, const Vector &desiredTo, float *fraction ) const
+{
+	VPROF_BUDGET( "Locomotion::HasPotentialGap", "NextBot" );
+
+	// find section of this ray that is actually traversable
+	float traversableFraction;
+	IsPotentiallyTraversable( from, desiredTo, IMMEDIATELY, &traversableFraction );
+
+	// compute end of traversable ray
+	Vector to = from + ( desiredTo - from ) * traversableFraction;
+
+	Vector forward = to - from;
+	float length = forward.NormalizeInPlace();
+
+	IBody *body = GetBot()->GetBodyInterface();
+
+	float step = body->GetHullWidth()/2.0f;
+
+	// scan along the line checking for gaps
+	Vector pos = from;
+	Vector delta = step * forward;
+	for( float t = 0.0f; t < (length + step); t += step )
+	{
+		if ( IsGap( pos, forward ) )
+		{
+			if ( fraction )
+			{
+				*fraction = ( t - step ) / ( length + step );
+			}
+			
+			return true;
+		}
+
+		pos += delta;		
+	}
+
+	if ( fraction )
+	{
+		*fraction = 1.0f;
+	}
+
+	return false;
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+/**
+ * Return true if there is a "gap" here when moving in the given direction.
+ * A "gap" is a vertical dropoff that is too high to jump back up to.
+ */
+bool ILocomotion::IsGap( const Vector &pos, const Vector &forward ) const
+{
+	VPROF_BUDGET( "Locomotion::IsGap", "NextBotSpiky" );
+
+	IBody *body = GetBot()->GetBodyInterface();
+
+	//float halfWidth = ( body ) ? body->GetHullWidth()/2.0f : 1.0f;
+
+	// can't really jump effectively when crouched anyhow
+	//float hullHeight = ( body ) ? body->GetStandHullHeight() : 1.0f;
+
+	// use a small hull since we cannot simulate collision resolution and avoidance along the way
+	const float halfWidth = 1.0f;
+	const float hullHeight = 1.0f;
+
+	unsigned int mask = ( body ) ? body->GetSolidMask() : MASK_PLAYERSOLID;
+
+	trace_t ground;
+
+	NextBotTraceFilterIgnoreActors filter( GetBot()->GetEntity(), COLLISION_GROUP_NONE );
+
+	TraceHull( pos + Vector( 0, 0, GetStepHeight() ),	// start up a bit to handle rough terrain
+					pos + Vector( 0, 0, -GetMaxJumpHeight() ), 
+					Vector( -halfWidth, -halfWidth, 0 ), Vector( halfWidth, halfWidth, hullHeight ), 
+					mask, &filter, &ground );
+
+// 	int r,g,b;
+// 
+// 	if ( ground.fraction >= 1.0f && !ground.startsolid )
+// 	{
+// 		r = 255, g = 0, b = 0;
+// 	}
+// 	else
+// 	{
+// 		r = 0, g = 255, b = 0;
+// 	}
+// 
+// 	NDebugOverlay::SweptBox( pos,
+// 							 pos + Vector( 0, 0, -GetStepHeight() ),
+// 							 Vector( -halfWidth, -halfWidth, 0 ), Vector( halfWidth, halfWidth, hullHeight ),
+// 							 vec3_angle,
+// 							 r, g, b, 255, 3.0f );
+
+	// if trace hit nothing, there's a gap ahead of us
+	return ( ground.fraction >= 1.0f && !ground.startsolid );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+bool ILocomotion::IsEntityTraversable( CBaseEntity *obstacle, TraverseWhenType when ) const
+{
+	if ( obstacle->IsWorld() )
+		return false;
+
+	// assume bot will open a door in its path
+	if ( FClassnameIs( obstacle, "prop_door*" ) || FClassnameIs( obstacle, "func_door*" ) )
+	{
+		CBasePropDoor *door = dynamic_cast< CBasePropDoor * >( obstacle );
+
+		if ( door && door->IsDoorOpen() )
+		{
+			// open doors are obstacles
+			return false;
+		}
+
+		return true;
+	}
+
+	// if we hit a clip brush, ignore it if it is not BRUSHSOLID_ALWAYS
+	if ( FClassnameIs( obstacle, "func_brush" ) )
+	{
+		CFuncBrush *brush = (CFuncBrush *)obstacle;
+		
+		switch ( brush->m_iSolidity )
+		{
+			case CFuncBrush::BRUSHSOLID_ALWAYS:
+				return false;
+			case CFuncBrush::BRUSHSOLID_NEVER:
+				return true;
+			case CFuncBrush::BRUSHSOLID_TOGGLE:
+				return true;
+		}
+	}
+
+	if ( when == IMMEDIATELY )
+	{
+		// special rules in specific games can immediately break some breakables, etc.
+		return false;
+	}
+
+	// assume bot will EVENTUALLY break breakables in its path
+	return GetBot()->IsAbleToBreak( obstacle );
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+bool ILocomotion::IsAreaTraversable( const CNavArea *baseArea ) const
+{ 
+	return !baseArea->IsBlocked( GetBot()->GetEntity()->GetTeamNumber() );
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+/**
+ * Reset stuck status to un-stuck
+ */
+void ILocomotion::ClearStuckStatus( const char *reason )
+{
+	if ( IsStuck() )
+	{
+		m_isStuck = false;
+
+		// tell other components we're no longer stuck
+		GetBot()->OnUnStuck();
+	}
+
+	// always reset stuck monitoring data in case we cleared preemptively are were not yet stuck
+	m_stuckPos = GetFeet();
+	m_stuckTimer.Start();
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		DevMsg( "%3.2f: ClearStuckStatus: %s %s\n", gpGlobals->curtime, GetBot()->GetDebugIdentifier(), reason );
+	}
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+/** 
+ * Stuck check
+ */
+void ILocomotion::StuckMonitor( void )
+{
+	// a timer is needed to smooth over a few frames of inactivity due to state changes, etc.
+	// we only want to detect idle situations when the bot really doesn't "want" to move.
+	const float idleTime = 0.25f;
+	if ( m_moveRequestTimer.IsGreaterThen( idleTime ) )
+	{
+		// we have no desire to move, and therefore cannot emit stuck events
+
+		// prepare our internal state for when the bot starts to move next
+		m_stuckPos = GetFeet();
+		m_stuckTimer.Start();
+
+		return;
+	}
+
+// 	if ( !IsOnGround() )
+// 	{
+// 		// can't be stuck when in-air
+// 		ClearStuckStatus( "Off the ground" );
+// 		return;
+// 	}
+
+// 	if ( IsUsingLadder() )
+// 	{
+// 		// can't be stuck when on a ladder (for now)
+// 		ClearStuckStatus( "On a ladder" );
+// 		return;
+// 	}
+
+	if ( IsStuck() )
+	{
+		// we are/were stuck - have we moved enough to consider ourselves "dislodged"
+		if ( GetBot()->IsRangeGreaterThan( m_stuckPos, STUCK_RADIUS ) )
+		{
+			// we've just become un-stuck
+			ClearStuckStatus( "UN-STUCK" );
+		}
+		else
+		{
+			// still stuck - periodically resend the event
+			if ( m_stillStuckTimer.IsElapsed() )
+			{
+				m_stillStuckTimer.Start( 1.0f );
+
+				if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+				{
+					DevMsg( "%3.2f: %s STILL STUCK\n", gpGlobals->curtime, GetBot()->GetDebugIdentifier() );
+					NDebugOverlay::Circle( m_stuckPos + Vector( 0, 0, 5.0f ), QAngle( -90.0f, 0, 0 ), 5.0f, 255, 0, 0, 255, true, 1.0f );
+				}
+
+				GetBot()->OnStuck();
+			}
+		}
+	}
+	else
+	{
+		// we're not stuck - yet
+
+		if ( /*IsClimbingOrJumping() || */GetBot()->IsRangeGreaterThan( m_stuckPos, STUCK_RADIUS ) )
+		{
+			// we have moved - reset anchor
+			m_stuckPos = GetFeet();
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+			{
+				NDebugOverlay::Cross3D( m_stuckPos, 3.0f, 255, 0, 255, true, 3.0f );
+			}
+
+			m_stuckTimer.Start();
+		}
+		else
+		{
+			// within stuck range of anchor. if we've been here too long, we're stuck
+			if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+			{
+				NDebugOverlay::Line( GetBot()->GetEntity()->WorldSpaceCenter(), m_stuckPos, 255, 0, 255, true, 0.1f );
+			}
+
+			float minMoveSpeed = 0.1f * GetDesiredSpeed() + 0.1f;
+			float escapeTime = STUCK_RADIUS / minMoveSpeed;
+			if ( m_stuckTimer.IsGreaterThen( escapeTime ) )
+			{
+				// we have taken too long - we're stuck
+				m_isStuck = true;
+
+				if ( GetBot()->IsDebugging( NEXTBOT_ERRORS ) )
+				{
+					DevMsg( "%3.2f: %s STUCK at position( %3.2f, %3.2f, %3.2f )\n", gpGlobals->curtime, GetBot()->GetDebugIdentifier(), m_stuckPos.x, m_stuckPos.y, m_stuckPos.z );
+
+					NDebugOverlay::Circle( m_stuckPos + Vector( 0, 0, 15.0f ), QAngle( -90.0f, 0, 0 ), 3.0f, 255, 255, 0, 255, true, 1.0f );
+					NDebugOverlay::Circle( m_stuckPos + Vector( 0, 0, 5.0f ), QAngle( -90.0f, 0, 0 ), 5.0f, 255, 0, 0, 255, true, 9999999.9f );
+				}
+
+				// tell other components we've become stuck
+				GetBot()->OnStuck();
+			}
+		}
+	}
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+const Vector &ILocomotion::GetFeet( void ) const
+{
+	return GetBot()->GetEntity()->GetAbsOrigin();
+}
+

game/server/NextBot/NextBotLocomotionInterface.h

@@ -0,0 +1,335 @@
+// NextBotLocomotionInterface.h
+// NextBot interface for movement through the environment
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_LOCOMOTION_INTERFACE_H_
+#define _NEXT_BOT_LOCOMOTION_INTERFACE_H_
+
+#include "NextBotComponentInterface.h"
+
+class Path;
+class INextBot;
+class CNavLadder;
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface encapsulating *how* a bot moves through the world (walking? flying? etc)
+ */
+class ILocomotion : public INextBotComponent
+{
+public:
+	ILocomotion( INextBot *bot );
+	virtual ~ILocomotion();
+	
+	virtual void Reset( void );								// (EXTEND) reset to initial state
+	virtual void Update( void );							// (EXTEND) update internal state
+	
+	//
+	// The primary locomotive method
+	// Depending on the physics of the bot's motion, it may not actually
+	// reach the given position precisely.
+	// The 'weight' can be used to combine multiple Approach() calls within
+	// a single frame into a single goal (ie: weighted average)
+	//
+	virtual void Approach( const Vector &goalPos, float goalWeight = 1.0f );	// (EXTEND) move directly towards the given position
+
+	//
+	// Move the bot to the precise given position immediately, 
+	// updating internal state as needed
+	// Collision resolution is done to prevent interpenetration, which may prevent
+	// the bot from reaching the given position. If no collisions occur, the
+	// bot will be at the given position when this method returns.
+	//
+	virtual void DriveTo( const Vector &pos );				// (EXTEND) Move the bot to the precise given position immediately, 
+
+	//
+	// Locomotion modifiers
+	//
+	virtual bool ClimbUpToLedge( const Vector &landingGoal, const Vector &landingForward, const CBaseEntity *obstacle ) { return true; }	// initiate a jump to an adjacent high ledge, return false if climb can't start
+	virtual void JumpAcrossGap( const Vector &landingGoal, const Vector &landingForward ) { }	// initiate a jump across an empty volume of space to far side
+	virtual void Jump( void ) { }							// initiate a simple undirected jump in the air
+	virtual bool IsClimbingOrJumping( void ) const;			// is jumping in any form
+	virtual bool IsClimbingUpToLedge( void ) const;			// is climbing up to a high ledge
+	virtual bool IsJumpingAcrossGap( void ) const;			// is jumping across a gap to the far side
+	virtual bool IsScrambling( void ) const;				// is in the middle of a complex action (climbing a ladder, climbing a ledge, jumping, etc) that shouldn't be interrupted
+
+	virtual void Run( void ) { }							// set desired movement speed to running
+	virtual void Walk( void ) { }							// set desired movement speed to walking
+	virtual void Stop( void ) { }							// set desired movement speed to stopped
+	virtual bool IsRunning( void ) const;
+	virtual void SetDesiredSpeed( float speed ) { }			// set desired speed for locomotor movement
+	virtual float GetDesiredSpeed( void ) const;			// returns the current desired speed
+
+	virtual void SetSpeedLimit( float speed ) { }					// set maximum speed bot can reach, regardless of desired speed
+	virtual float GetSpeedLimit( void ) const { return 1000.0f; }	// get maximum speed bot can reach, regardless of desired speed
+
+	virtual bool IsOnGround( void ) const;					// return true if standing on something
+	virtual void OnLeaveGround( CBaseEntity *ground ) { }	// invoked when bot leaves ground for any reason
+	virtual void OnLandOnGround( CBaseEntity *ground ) { }	// invoked when bot lands on the ground after being in the air
+	virtual CBaseEntity *GetGround( void ) const;			// return the current ground entity or NULL if not on the ground
+	virtual const Vector &GetGroundNormal( void ) const;	// surface normal of the ground we are in contact with
+	virtual float GetGroundSpeed( void ) const;				// return current world space speed in XY plane
+	virtual const Vector &GetGroundMotionVector( void ) const;	// return unit vector in XY plane describing our direction of motion - even if we are currently not moving
+
+	virtual void ClimbLadder( const CNavLadder *ladder, const CNavArea *dismountGoal ) { }		// climb the given ladder to the top and dismount
+	virtual void DescendLadder( const CNavLadder *ladder, const CNavArea *dismountGoal ) { }	// descend the given ladder to the bottom and dismount
+	virtual bool IsUsingLadder( void ) const;				// we are moving to get on, ascending/descending, and/or dismounting a ladder
+	virtual bool IsAscendingOrDescendingLadder( void ) const;	// we are actually on the ladder right now, either climbing up or down
+	virtual bool IsAbleToAutoCenterOnLadder( void ) const { return false; }
+
+	virtual void FaceTowards( const Vector &target ) { }	// rotate body to face towards "target"
+
+	virtual void SetDesiredLean( const QAngle &lean ) { }
+	virtual const QAngle &GetDesiredLean( void ) const;
+	
+
+	//
+	// Locomotion information
+	//
+	virtual bool IsAbleToJumpAcrossGaps( void ) const;		// return true if this bot can jump across gaps in its path
+	virtual bool IsAbleToClimb( void ) const;				// return true if this bot can climb arbitrary geometry it encounters
+
+	virtual const Vector &GetFeet( void ) const;			// return position of "feet" - the driving point where the bot contacts the ground
+
+	virtual float GetStepHeight( void ) const;				// if delta Z is greater than this, we have to jump to get up
+	virtual float GetMaxJumpHeight( void ) const;			// return maximum height of a jump
+	virtual float GetDeathDropHeight( void ) const;			// distance at which we will die if we fall
+
+	virtual float GetRunSpeed( void ) const;				// get maximum running speed
+	virtual float GetWalkSpeed( void ) const;				// get maximum walking speed
+
+	virtual float GetMaxAcceleration( void ) const;			// return maximum acceleration of locomotor
+	virtual float GetMaxDeceleration( void ) const;			// return maximum deceleration of locomotor
+
+	virtual const Vector &GetVelocity( void ) const;		// return current world space velocity
+	virtual float GetSpeed( void ) const;					// return current world space speed (magnitude of velocity)
+	virtual const Vector &GetMotionVector( void ) const;	// return unit vector describing our direction of motion - even if we are currently not moving
+
+	virtual bool IsAreaTraversable( const CNavArea *baseArea ) const;	// return true if given area can be used for navigation
+
+	virtual float GetTraversableSlopeLimit( void ) const;	// return Z component of unit normal of steepest traversable slope
+
+	// return true if the given entity can be ignored during locomotion
+	enum TraverseWhenType 
+	{ 
+		IMMEDIATELY,		// the entity will not block our motion - we'll carry right through
+		EVENTUALLY			// the entity will block us until we spend effort to open/destroy it
+	};
+
+	/**
+	 * Return true if this locomotor could potentially move along the line given.
+	 * If false is returned, fraction of walkable ray is returned in 'fraction'
+	 */
+	virtual bool IsPotentiallyTraversable( const Vector &from, const Vector &to, TraverseWhenType when = EVENTUALLY, float *fraction = NULL ) const;
+
+	/**
+	 * Return true if there is a possible "gap" that will need to be jumped over
+	 * If true is returned, fraction of ray before gap is returned in 'fraction'
+	 */
+	virtual bool HasPotentialGap( const Vector &from, const Vector &to, float *fraction = NULL ) const;
+
+	// return true if there is a "gap" here when moving in the given direction
+	virtual bool IsGap( const Vector &pos, const Vector &forward ) const;
+
+	virtual bool IsEntityTraversable( CBaseEntity *obstacle, TraverseWhenType when = EVENTUALLY ) const;
+
+	//
+	// Stuck state.  If the locomotor cannot make progress, it becomes "stuck" and can only leave 
+	// this stuck state by successfully moving and becoming un-stuck.
+	//
+	virtual bool IsStuck( void ) const;				// return true if bot is stuck 
+	virtual float GetStuckDuration( void ) const;	// return how long we've been stuck
+	virtual void ClearStuckStatus( const char *reason = "" );	// reset stuck status to un-stuck
+
+	virtual bool IsAttemptingToMove( void ) const;	// return true if we have tried to Approach() or DriveTo() very recently
+
+	void TraceHull( const Vector& start, const Vector& end, const Vector &mins, const Vector &maxs, unsigned int fMask, ITraceFilter *pFilter, trace_t *pTrace ) const;
+
+	/**
+	 * Should we collide with this entity?
+	 */
+	virtual bool ShouldCollideWith( const CBaseEntity *object ) const	{ return true; }
+
+
+protected:
+	virtual void AdjustPosture( const Vector &moveGoal );
+	virtual void StuckMonitor( void );
+
+private:
+	Vector m_motionVector;
+	Vector m_groundMotionVector;
+	float m_speed;
+	float m_groundSpeed;
+
+	// stuck monitoring
+	bool m_isStuck;									// if true, we are stuck
+	IntervalTimer m_stuckTimer;						// how long we've been stuck
+	CountdownTimer m_stillStuckTimer;				// for resending stuck events
+	Vector m_stuckPos;								// where we got stuck
+	IntervalTimer m_moveRequestTimer;
+};
+
+
+inline bool ILocomotion::IsAbleToJumpAcrossGaps( void ) const
+{
+	return true;
+}
+
+inline bool ILocomotion::IsAbleToClimb( void ) const
+{
+	return true;
+}
+
+inline bool ILocomotion::IsAttemptingToMove( void ) const
+{
+	return m_moveRequestTimer.HasStarted() && m_moveRequestTimer.GetElapsedTime() < 0.25f;
+}
+
+inline bool ILocomotion::IsScrambling( void ) const
+{
+	return !IsOnGround() || IsClimbingOrJumping() || IsAscendingOrDescendingLadder();
+}
+
+inline bool ILocomotion::IsClimbingOrJumping( void ) const
+{
+	return false;
+}
+
+inline bool ILocomotion::IsClimbingUpToLedge( void ) const
+{
+	return false;
+}
+
+inline bool ILocomotion::IsJumpingAcrossGap( void ) const
+{
+	return false;
+}
+
+inline bool ILocomotion::IsRunning( void ) const
+{
+	return false;
+}
+
+inline float ILocomotion::GetDesiredSpeed( void ) const
+{
+	return 0.0f;
+}
+
+inline bool ILocomotion::IsOnGround( void ) const
+{
+	return false;
+}
+
+inline CBaseEntity *ILocomotion::GetGround( void ) const
+{
+	return NULL;
+}
+
+inline const Vector &ILocomotion::GetGroundNormal( void ) const
+{
+	return vec3_origin;
+}
+
+inline float ILocomotion::GetGroundSpeed( void ) const
+{
+	return m_groundSpeed;
+}
+
+inline const Vector & ILocomotion::GetGroundMotionVector( void ) const
+{
+	return m_groundMotionVector;
+}
+
+inline bool ILocomotion::IsUsingLadder( void ) const
+{
+	return false;
+}
+
+inline bool ILocomotion::IsAscendingOrDescendingLadder( void ) const
+{
+	return false;
+}
+
+inline const QAngle &ILocomotion::GetDesiredLean( void ) const
+{
+	return vec3_angle;
+}
+
+inline float ILocomotion::GetStepHeight( void ) const
+{
+	return 0.0f;
+}
+
+inline float ILocomotion::GetMaxJumpHeight( void ) const
+{
+	return 0.0f;
+}
+
+inline float ILocomotion::GetDeathDropHeight( void ) const
+{
+	return 0.0f;
+}
+
+inline float ILocomotion::GetRunSpeed( void ) const
+{
+	return 0.0f;
+}
+
+inline float ILocomotion::GetWalkSpeed( void ) const
+{
+	return 0.0f;
+}
+
+inline float ILocomotion::GetMaxAcceleration( void ) const
+{
+	return 0.0f;
+}
+
+inline float ILocomotion::GetMaxDeceleration( void ) const
+{
+	return 0.0f;
+}
+
+inline const Vector &ILocomotion::GetVelocity( void ) const
+{
+	return vec3_origin;
+}
+
+inline float ILocomotion::GetSpeed( void ) const
+{
+	return m_speed;
+}
+
+inline const Vector & ILocomotion::GetMotionVector( void ) const
+{
+	return m_motionVector;
+}
+
+inline float ILocomotion::GetTraversableSlopeLimit( void ) const	
+{ 
+	return 0.6; 
+}
+
+inline bool ILocomotion::IsStuck( void ) const
+{
+	return m_isStuck;
+}
+
+inline float ILocomotion::GetStuckDuration( void ) const
+{
+	return ( IsStuck() ) ? m_stuckTimer.GetElapsedTime() : 0.0f;
+}
+
+inline void ILocomotion::TraceHull( const Vector& start, const Vector& end, const Vector &mins, const Vector &maxs, unsigned int fMask, ITraceFilter *pFilter, trace_t *pTrace ) const
+{
+//	VPROF_BUDGET( "ILocomotion::TraceHull", "TraceHull" );
+	Ray_t ray;
+	ray.Init( start, end, mins, maxs );
+	enginetrace->TraceRay( ray, fMask, pFilter, pTrace );
+}
+
+
+
+#endif // _NEXT_BOT_LOCOMOTION_INTERFACE_H_
+

game/server/NextBot/NextBotManager.cpp

@@ -0,0 +1,892 @@
+// NextBotManager.cpp
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBotManager.h"
+#include "NextBotInterface.h"
+
+#ifdef TERROR
+#include "ZombieBot/Infected/Infected.h"
+#include "ZombieBot/Witch/Witch.h"
+#include "ZombieManager.h"
+#endif
+
+#include "SharedFunctorUtils.h"
+//#include "../../common/blackbox_helper.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+extern ConVar ZombieMobMaxSize;
+
+ConVar nb_update_frequency( "nb_update_frequency", ".1", FCVAR_CHEAT );
+ConVar nb_update_framelimit( "nb_update_framelimit", ( IsDebug() ) ? "30" : "15", FCVAR_CHEAT );
+ConVar nb_update_maxslide( "nb_update_maxslide", "2", FCVAR_CHEAT );
+ConVar nb_update_debug( "nb_update_debug", "0", FCVAR_CHEAT );
+
+//---------------------------------------------------------------------------------------------
+//---------------------------------------------------------------------------------------------
+/**
+ * Singleton accessor.
+ * By returning a reference, we guarantee construction of the 
+ * instance before its first use.
+ */
+NextBotManager &TheNextBots( void )
+{
+	if ( NextBotManager::GetInstance() )
+	{
+		return *NextBotManager::GetInstance();
+	}
+	else
+	{
+		static NextBotManager manager;
+		NextBotManager::SetInstance( &manager );
+		return manager;
+	}
+}
+
+NextBotManager* NextBotManager::sInstance = NULL;
+
+//---------------------------------------------------------------------------------------------
+//---------------------------------------------------------------------------------------------
+static const char *debugTypeName[] =
+{
+	"BEHAVIOR",
+	"LOOK_AT",
+	"PATH",
+	"ANIMATION",
+	"LOCOMOTION",
+	"VISION",
+	"HEARING",
+	"EVENTS",
+	"ERRORS",
+	NULL
+};
+
+
+static void CC_SetDebug( const CCommand &args )
+{
+	if ( args.ArgC() < 2 )
+	{
+		Msg( "Debugging stopped\n" );
+		TheNextBots().SetDebugTypes( NEXTBOT_DEBUG_NONE );
+		return;
+	}
+
+	int debugType = 0;
+
+	for( int i=1; i<args.ArgC(); ++i )
+	{
+		int type;
+		for( type = 0; debugTypeName[ type ]; ++type )
+		{
+			const char *token = args[i];
+
+			// special token that means "all"
+			if ( token[0] == '*' )
+			{
+				debugType = NEXTBOT_DEBUG_ALL;
+				break;
+			}
+
+			if ( !Q_strnicmp( args[i], debugTypeName[ type ], Q_strlen( args[1] ) ) )
+			{
+				debugType |= ( 1 << type );
+				break;
+			}
+		}
+
+		if ( !debugTypeName[ type ] )
+		{
+			Msg( "Invalid debug type '%s'\n", args[i] );
+		}
+	}
+
+	// enable debugging
+	TheNextBots().SetDebugTypes( ( NextBotDebugType ) debugType );
+}
+static ConCommand SetDebug( "nb_debug", CC_SetDebug, "Debug NextBots.  Categories are: BEHAVIOR, LOOK_AT, PATH, ANIMATION, LOCOMOTION, VISION, HEARING, EVENTS, ERRORS.", FCVAR_CHEAT );
+
+//---------------------------------------------------------------------------------------------
+static void CC_SetDebugFilter( const CCommand &args )
+{
+	if ( args.ArgC() < 2 )
+	{
+		Msg( "Debug filter cleared.\n" );
+		TheNextBots().DebugFilterClear();
+		return;
+	}
+
+	for( int i=1; i<args.ArgC(); ++i )
+	{
+		int index = Q_atoi( args[i] );
+		if ( index > 0 )
+		{
+			TheNextBots().DebugFilterAdd( index );
+		}
+		else
+		{
+			TheNextBots().DebugFilterAdd( args[i] );
+		}
+	}
+}
+static ConCommand SetDebugFilter( "nb_debug_filter", CC_SetDebugFilter, "Add items to the NextBot debug filter. Items can be entindexes or part of the indentifier of one or more bots.", FCVAR_CHEAT );
+
+
+//---------------------------------------------------------------------------------------------
+class Selector
+{
+public:
+	Selector( CBasePlayer *player, bool useLOS )
+	{
+		m_player = player;
+		player->EyeVectors( &m_forward );
+
+		m_pick = NULL;
+		m_pickRange = 99999999999999.9f;
+		m_useLOS = useLOS;
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		CBaseCombatCharacter *botEntity = bot->GetEntity();
+		if ( botEntity->IsAlive() )
+		{
+			Vector to = botEntity->WorldSpaceCenter() - m_player->EyePosition();
+			float range = to.NormalizeInPlace();
+
+			if ( DotProduct( m_forward, to ) > 0.98f && range < m_pickRange )
+			{
+				if ( !m_useLOS || m_player->IsAbleToSee( botEntity, CBaseCombatCharacter::DISREGARD_FOV ) )
+				{
+					m_pick = bot;
+					m_pickRange = range;
+				}
+			}
+		}
+		return true;
+	}
+
+	CBasePlayer *m_player;
+	Vector m_forward;
+	INextBot *m_pick;
+	float m_pickRange;
+	bool m_useLOS;
+};
+
+static void CC_SelectBot( const CCommand &args )
+{
+	CBasePlayer *player = UTIL_GetListenServerHost();
+	if ( player )
+	{
+		Selector select( player, false );
+		TheNextBots().ForEachBot( select );
+
+		TheNextBots().Select( select.m_pick );				
+
+		if ( select.m_pick )
+		{
+			NDebugOverlay::Circle( select.m_pick->GetLocomotionInterface()->GetFeet() + Vector( 0, 0, 5 ), Vector( 1, 0, 0 ), Vector( 0, -1, 0 ), 25.0f, 0, 255, 0, 255, false, 1.0f );
+		}
+	}	
+}
+static ConCommand SelectBot( "nb_select", CC_SelectBot, "Select the bot you are aiming at for further debug operations.", FCVAR_CHEAT );
+
+
+//---------------------------------------------------------------------------------------------
+static void CC_ForceLookAt( const CCommand &args )
+{
+	CBasePlayer *player = UTIL_GetListenServerHost();
+	INextBot *pick = TheNextBots().GetSelected();
+
+	if ( player && pick )
+	{
+		pick->GetBodyInterface()->AimHeadTowards( player, IBody::CRITICAL, 9999999.9f, NULL, "Aim forced" );
+	}
+}
+static ConCommand ForceLookAt( "nb_force_look_at", CC_ForceLookAt, "Force selected bot to look at the local player's position", FCVAR_CHEAT );
+
+
+//--------------------------------------------------------------------------------------------------------
+void CC_WarpSelectedHere( const CCommand &args )
+{
+	CBasePlayer *me = dynamic_cast< CBasePlayer * >( UTIL_GetCommandClient() ); 
+	INextBot *pick = TheNextBots().GetSelected();
+
+	if ( me == NULL || pick == NULL )
+	{
+		return;
+	}
+
+	Vector forward;
+	me->EyeVectors( &forward );
+
+	trace_t result;
+	UTIL_TraceLine( me->EyePosition(), me->EyePosition() + 999999.9f * forward, MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, me, COLLISION_GROUP_NONE, &result );
+	if ( result.DidHit() )
+	{
+		Vector spot = result.endpos + Vector( 0, 0, 10.0f );
+		pick->GetEntity()->Teleport( &spot, &vec3_angle, &vec3_origin );
+	}
+}
+static ConCommand WarpSelectedHere( "nb_warp_selected_here", CC_WarpSelectedHere, "Teleport the selected bot to your cursor position", FCVAR_CHEAT );
+
+
+//---------------------------------------------------------------------------------------------
+//---------------------------------------------------------------------------------------------
+NextBotManager::NextBotManager( void )
+{
+	m_debugType = 0;
+	m_selectedBot = NULL;
+	
+	m_iUpdateTickrate = 0;
+}
+
+//---------------------------------------------------------------------------------------------
+NextBotManager::~NextBotManager()
+{
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Reset to initial state
+ */
+void NextBotManager::Reset( void )
+{
+	// remove the NextBots that should go away during a reset (they will unregister themselves as they go)
+	int i = m_botList.Head();
+	while ( i != m_botList.InvalidIndex() )
+	{
+		int iNext = m_botList.Next( i );
+		if ( m_botList[i]->IsRemovedOnReset() )
+		{
+			UTIL_Remove( m_botList[i]->GetEntity() );
+			//Assert( !m_botList.IsInList( i ) );	// UTIL_Remove() calls UpdateOnRemove, adds EFL_KILLME, but doesn't delete until the end of the frame
+		}
+		i = iNext;
+	}
+
+	m_selectedBot = NULL;
+}
+
+
+//---------------------------------------------------------------------------------------------
+
+inline bool IsDead( INextBot *pBot )
+{
+	CBaseCombatCharacter *pEntity = pBot->GetEntity();
+	if ( pEntity )
+	{
+		if ( pEntity->IsPlayer() && pEntity->m_lifeState == LIFE_DEAD )
+		{
+			return true;
+		}
+			
+		if ( pEntity->IsMarkedForDeletion() )
+		{
+			return true;
+		}
+
+		if ( pEntity->m_pfnThink == &CBaseEntity::SUB_Remove )
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+//---------------------------------------------------------------------------------------------
+
+// Debug stats for update balancing
+static int g_nRun;
+static int g_nSlid;
+static int g_nBlockedSlides;
+
+void NextBotManager::Update( void )
+{
+	// do lightweight upkeep every tick
+	for( int u=m_botList.Head(); u != m_botList.InvalidIndex(); u = m_botList.Next( u ) )
+	{
+		m_botList[ u ]->Upkeep();
+	}
+
+	// schedule full updates
+	if ( m_botList.Count() )
+	{
+		static int iCurFrame = -1;
+		if ( iCurFrame != gpGlobals->framecount )
+		{
+			iCurFrame = gpGlobals->framecount;
+			m_SumFrameTime = 0;
+		}
+		else
+		{
+			// Don't run multiple ticks in a frame
+			return;
+		}
+
+		int tickRate = TIME_TO_TICKS( nb_update_frequency.GetFloat() );
+		if ( tickRate < 0 )
+		{
+			tickRate = 0;
+		}
+
+		if ( m_iUpdateTickrate != tickRate )
+		{
+			Msg( "NextBot tickrate changed from %d (%.3fms) to %d (%.3fms)\n", m_iUpdateTickrate, TICKS_TO_TIME( m_iUpdateTickrate ), tickRate, TICKS_TO_TIME( tickRate ) );
+			m_iUpdateTickrate = tickRate;
+		}
+
+		int i = 0;
+		int nScheduled = 0;
+		int nNonResponsive = 0;
+		int nDead = 0;
+		if ( m_iUpdateTickrate > 0 )
+		{
+			INextBot *pBot;
+
+			// Count dead bots, they won't update and balancing calculations should exclude them
+			for( i = m_botList.Head(); i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+			{
+				if ( IsDead( m_botList[i] ) )
+				{
+					nDead++;
+				}
+			}
+
+
+			int nTargetToRun = ceilf( (float)( m_botList.Count() - nDead ) / (float)m_iUpdateTickrate );
+			int curtickcount = gpGlobals->tickcount;
+
+			for( i = m_botList.Head(); nTargetToRun && i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+			{
+				pBot = m_botList[i];
+				if ( pBot->IsFlaggedForUpdate() )
+				{
+					// Was offered a run last tick but didn't take it, push it back
+					// Leave the flag set so that bot will run right away later, but be ignored
+					// until then
+					nNonResponsive++;
+				}
+				else
+				{
+					if ( curtickcount - pBot->GetTickLastUpdate() < m_iUpdateTickrate )
+					{
+						break;
+					}
+					if ( !IsDead( pBot ) )
+					{
+						pBot->FlagForUpdate();
+						nTargetToRun--;
+						nScheduled++;
+					}
+				}
+			}
+		}
+		else
+		{
+			nScheduled = m_botList.Count();
+		}
+
+		if ( nb_update_debug.GetBool() )
+		{
+			int nIntentionalSliders = 0;
+			if ( m_iUpdateTickrate > 0 )
+			{
+				for( ; i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+				{
+					if ( gpGlobals->tickcount - m_botList[i]->GetTickLastUpdate() >= m_iUpdateTickrate )
+					{
+						nIntentionalSliders++;
+					}
+				}
+			}
+
+			Msg( "Frame %8d/tick %8d: %3d run of %3d, %3d sliders, %3d blocked slides, scheduled %3d for next tick, %3d intentional sliders, %d nonresponsive, %d dead\n", gpGlobals->framecount - 1, gpGlobals->tickcount - 1, g_nRun, m_botList.Count() - nDead, g_nSlid, g_nBlockedSlides, nScheduled, nIntentionalSliders, nNonResponsive, nDead );
+			g_nRun = g_nSlid = g_nBlockedSlides = 0;
+		}
+
+	}
+}
+
+//---------------------------------------------------------------------------------------------
+bool NextBotManager::ShouldUpdate( INextBot *bot )
+{
+	if ( m_iUpdateTickrate < 1 )
+	{
+		return true;
+	}
+
+	float frameLimit = nb_update_framelimit.GetFloat();
+	float sumFrameTime = 0;
+	if ( bot->IsFlaggedForUpdate() )
+	{
+		bot->FlagForUpdate( false );
+		sumFrameTime = m_SumFrameTime * 1000.0;
+		if ( frameLimit > 0.0f )
+		{
+			if ( sumFrameTime < frameLimit )
+			{
+				return true;
+			}
+			else if ( nb_update_debug.GetBool() )
+			{
+				Msg( "Frame %8d/tick %8d: frame out of budget (%.2fms > %.2fms)\n", gpGlobals->framecount, gpGlobals->tickcount, sumFrameTime, frameLimit );
+			}
+		}
+	}
+
+	int nTicksSlid = ( gpGlobals->tickcount - bot->GetTickLastUpdate() ) - m_iUpdateTickrate;
+
+	if ( nTicksSlid >= nb_update_maxslide.GetInt() )
+	{
+		if ( frameLimit == 0.0 || sumFrameTime < nb_update_framelimit.GetFloat() * 2.0 )
+		{
+			g_nBlockedSlides++;
+			return true;
+		}
+	}
+
+	if ( nb_update_debug.GetBool() )
+	{
+		if ( nTicksSlid > 0 )
+		{
+			g_nSlid++;
+		}
+	}
+
+	return false;
+}
+
+//---------------------------------------------------------------------------------------------
+void NextBotManager::NotifyBeginUpdate( INextBot *bot )
+{
+	if ( nb_update_debug.GetBool() )
+	{
+		g_nRun++;
+	}
+
+	m_botList.Unlink( bot->GetBotId() );
+	m_botList.LinkToTail( bot->GetBotId() );
+	bot->SetTickLastUpdate( gpGlobals->tickcount );
+
+	m_CurUpdateStartTime = Plat_FloatTime();
+}
+
+//---------------------------------------------------------------------------------------------
+void NextBotManager::NotifyEndUpdate( INextBot *bot )
+{
+	// This might be a good place to detect a particular bot had spiked [3/14/2008 tom]
+	m_SumFrameTime += Plat_FloatTime() - m_CurUpdateStartTime;
+}
+
+//---------------------------------------------------------------------------------------------
+/**
+ * When the server has changed maps
+ */
+void NextBotManager::OnMapLoaded( void )
+{
+	Reset();
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * When the scenario restarts
+ */
+void NextBotManager::OnRoundRestart( void )
+{
+	Reset();
+}
+
+
+//---------------------------------------------------------------------------------------------
+int NextBotManager::Register( INextBot *bot )
+{
+	return m_botList.AddToHead( bot );
+}
+
+
+//---------------------------------------------------------------------------------------------
+void NextBotManager::UnRegister( INextBot *bot )
+{
+	m_botList.Remove( bot->GetBotId() );
+
+	if ( bot == m_selectedBot)
+	{
+		// we can't access virtual methods because this is called from a destructor, so just clear it
+		m_selectedBot = NULL;
+	}
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+void NextBotManager::OnBeginChangeLevel( void )
+{
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+class NextBotKilledNotifyScan
+{
+public:
+	NextBotKilledNotifyScan( CBaseCombatCharacter *victim, const CTakeDamageInfo &info )
+	{
+		m_victim = victim;
+		m_info = info;
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		if ( bot->GetEntity()->IsAlive() && !bot->IsSelf( m_victim ) )
+		{
+			bot->OnOtherKilled( m_victim, m_info );
+		}
+		return true;
+	}
+
+	CBaseCombatCharacter *m_victim;
+	CTakeDamageInfo m_info;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * When an actor is killed.  Propagate to all NextBots.
+ */
+void NextBotManager::OnKilled( CBaseCombatCharacter *victim, const CTakeDamageInfo &info )
+{
+	NextBotKilledNotifyScan notify( victim, info );
+	TheNextBots().ForEachBot( notify );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+class NextBotSoundNotifyScan
+{
+public:
+	NextBotSoundNotifyScan( CBaseEntity *source, const Vector &pos, KeyValues *keys ) : m_source( source ), m_pos( pos ), m_keys( keys )
+	{
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		if ( bot->GetEntity()->IsAlive() && !bot->IsSelf( m_source ) )
+		{
+			bot->OnSound( m_source, m_pos, m_keys );
+		}
+		return true;
+	}
+
+	CBaseEntity *m_source;
+	const Vector &m_pos;
+	KeyValues *m_keys;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * When an entity emits a sound
+ */
+void NextBotManager::OnSound( CBaseEntity *source, const Vector &pos, KeyValues *keys )
+{
+	NextBotSoundNotifyScan notify( source, pos, keys );
+	TheNextBots().ForEachBot( notify );
+
+	if ( source && IsDebugging( NEXTBOT_HEARING ) )
+	{
+		int r,g,b;
+		switch( source->GetTeamNumber() )
+		{
+			case FIRST_GAME_TEAM:		r = 0;   g = 255; b = 0; break;
+			case (FIRST_GAME_TEAM+1):	r = 255; g = 0;   b = 0; break;
+			default:					r = 255; g = 255; b = 0; break;
+		}
+		NDebugOverlay::Circle( pos, Vector( 1, 0, 0 ), Vector( 0, -1, 0 ), 5.0f, r, g, b, 255, true, 3.0f );
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+class NextBotResponseNotifyScan
+{
+public:
+	NextBotResponseNotifyScan( CBaseCombatCharacter *who, AIConcept_t concept, AI_Response *response ) : m_who( who ), m_concept( concept ), m_response( response )
+	{
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		if ( bot->GetEntity()->IsAlive() )
+		{
+			bot->OnSpokeConcept( m_who, m_concept, m_response );
+		}
+		return true;
+	}
+
+	CBaseCombatCharacter *m_who;
+	AIConcept_t m_concept;
+	AI_Response *m_response;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * When an Actor speaks a concept
+ */
+void NextBotManager::OnSpokeConcept( CBaseCombatCharacter *who, AIConcept_t concept, AI_Response *response )
+{
+	NextBotResponseNotifyScan notify( who, concept, response );
+	TheNextBots().ForEachBot( notify );
+
+	if ( IsDebugging( NEXTBOT_HEARING ) )
+	{
+		// const char *who = response->GetCriteria()->GetValue( response->GetCriteria()->FindCriterionIndex( "Who" ) );
+
+		// TODO: Need concept.GetStringConcept()
+		DevMsg( "%3.2f: OnSpokeConcept( %s, %s )\n", gpGlobals->curtime, who->GetDebugName(), "concept.GetStringConcept()" );
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+class NextBotWeaponFiredNotifyScan
+{
+public:
+	NextBotWeaponFiredNotifyScan( CBaseCombatCharacter *who, CBaseCombatWeapon *weapon ) : m_who( who ), m_weapon( weapon )
+	{
+	}
+
+	bool operator() ( INextBot *bot )
+	{
+		if ( bot->GetEntity()->IsAlive() )
+		{
+			bot->OnWeaponFired( m_who, m_weapon );
+		}
+		return true;
+	}
+
+	CBaseCombatCharacter *m_who;
+	CBaseCombatWeapon *m_weapon;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * When someone fires a weapon
+ */
+void NextBotManager::OnWeaponFired( CBaseCombatCharacter *whoFired, CBaseCombatWeapon *weapon )
+{
+	NextBotWeaponFiredNotifyScan notify( whoFired, weapon );
+	TheNextBots().ForEachBot( notify );
+
+	if ( IsDebugging( NEXTBOT_EVENTS ) )
+	{
+		DevMsg( "%3.2f: OnWeaponFired( %s, %s )\n", gpGlobals->curtime, whoFired->GetDebugName(), weapon->GetName() );
+	}
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Add given entindex to the debug filter
+ */
+void NextBotManager::DebugFilterAdd( int index )
+{
+	DebugFilter filter;
+
+	filter.index = index;
+	filter.name[0] = '\000';
+
+	m_debugFilterList.AddToTail( filter );
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Add given name to the debug filter
+ */
+void NextBotManager::DebugFilterAdd( const char *name )
+{
+	DebugFilter filter;
+
+	filter.index = -1;
+	Q_strncpy( filter.name, name, DebugFilter::MAX_DEBUG_NAME_SIZE );
+
+	m_debugFilterList.AddToTail( filter );
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Remove given entindex from the debug filter
+ */
+void NextBotManager::DebugFilterRemove( int index )
+{
+	for( int i=0; i<m_debugFilterList.Count(); ++i )
+	{
+		if ( m_debugFilterList[i].index == index )
+		{
+			m_debugFilterList.Remove( i );
+			break;
+		}
+	}
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Remove given name from the debug filter
+ */
+void NextBotManager::DebugFilterRemove( const char *name )
+{
+	for( int i=0; i<m_debugFilterList.Count(); ++i )
+	{
+		if ( m_debugFilterList[i].name[0] != '\000' &&
+			 !Q_strnicmp( name, m_debugFilterList[i].name, MIN( Q_strlen( name ), sizeof( m_debugFilterList[i].name ) ) ) )
+		{
+			m_debugFilterList.Remove( i );
+			break;
+		}
+	}
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Clear the debug filter (remove all entries)
+ */
+void NextBotManager::DebugFilterClear( void )
+{
+	m_debugFilterList.RemoveAll();
+}
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Return true if the given bot matches the debug filter
+ */
+bool NextBotManager::IsDebugFilterMatch( const INextBot *bot ) const
+{
+	// if the filter is empty, all bots match
+	if ( m_debugFilterList.Count() == 0 )
+	{
+		return true;
+	}
+
+	for( int i=0; i<m_debugFilterList.Count(); ++i )
+	{
+		// compare entity index
+		if ( m_debugFilterList[i].index == const_cast< INextBot * >( bot )->GetEntity()->entindex() )
+		{
+			return true;
+		}
+
+		// compare debug filter
+		if ( m_debugFilterList[i].name[0] != '\000' && bot->IsDebugFilterMatch( m_debugFilterList[i].name ) )
+		{
+			return true;
+		}
+
+		// compare special keyword meaning local player is looking at them
+		if ( !Q_strnicmp( m_debugFilterList[i].name, "lookat", Q_strlen( m_debugFilterList[i].name ) ) )
+		{
+			CBasePlayer *watcher = UTIL_GetListenServerHost();
+			if ( watcher )
+			{
+				CBaseEntity *subject = watcher->GetObserverTarget();
+
+				if ( subject && bot->IsSelf( subject ) )
+				{
+					return true;
+				}
+			}
+		}
+
+		// compare special keyword meaning NextBot is selected
+		if ( !Q_strnicmp( m_debugFilterList[i].name, "selected", Q_strlen( m_debugFilterList[i].name ) ) )
+		{
+			INextBot *selected = GetSelected();
+			if ( selected && bot->IsSelf( selected->GetEntity() ) )
+			{
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Get the bot under the given player's crosshair
+ */
+INextBot *NextBotManager::GetBotUnderCrosshair( CBasePlayer *picker )
+{
+	if ( !picker )
+		return NULL;
+
+	const float MaxDot = 0.7f;
+	const float MaxRange = 4000.0f;
+	TargetScan< CBaseCombatCharacter > scan( picker, TEAM_ANY, 1.0f - MaxDot, MaxRange );
+	ForEachCombatCharacter( scan );
+	CBaseCombatCharacter *target = scan.GetTarget();
+	if ( target && target->MyNextBotPointer() )
+		return target->MyNextBotPointer();
+
+	return NULL;
+}
+
+#ifdef NEED_BLACK_BOX
+//---------------------------------------------------------------------------------------------
+CON_COMMAND( nb_dump_debug_history, "Dumps debug history for the bot under the cursor to the blackbox" )
+{
+	if ( !NextBotDebugHistory.GetBool() )
+	{
+		BlackBox_Record( "bot", "nb_debug_history 0" );
+		return;
+	}
+
+	CBasePlayer *player = UTIL_GetCommandClient();
+	if ( !player )
+	{
+		player = UTIL_GetListenServerHost();
+	}
+	INextBot *bot = TheNextBots().GetBotUnderCrosshair( player );
+	if ( !bot )
+	{
+		BlackBox_Record( "bot", "no bot under crosshairs" );
+		return;
+	}
+
+	CUtlVector< const INextBot::NextBotDebugLineType * > lines;
+	bot->GetDebugHistory( (NEXTBOT_DEBUG_ALL & (~NEXTBOT_EVENTS)), &lines );
+
+	for ( int i=0; i<lines.Count(); ++i )
+	{
+		if ( IsPC() )
+		{
+			BlackBox_Record( "bot", "%s", lines[i]->data );
+		}
+	}
+}
+#endif // NEED_BLACK_BOX
+
+
+//---------------------------------------------------------------------------------------------
+void NextBotManager::CollectAllBots( CUtlVector< INextBot * > *botVector )
+{
+	if ( !botVector )
+		return;
+
+	botVector->RemoveAll();
+
+	for( int i=m_botList.Head(); i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+	{
+		botVector->AddToTail( m_botList[i] );
+	}
+}
+

game/server/NextBot/NextBotManager.h

@@ -0,0 +1,211 @@
+// NextBotManager.h
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_MANAGER_H_
+#define _NEXT_BOT_MANAGER_H_
+
+#include "NextBotInterface.h"
+
+class CTerrorPlayer;
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The NextBotManager manager 
+ */
+class NextBotManager
+{
+public:
+	NextBotManager( void );
+	virtual ~NextBotManager();
+
+	void Reset( void );								// reset to initial state
+	virtual void Update( void );
+
+	bool ShouldUpdate( INextBot *bot );
+	void NotifyBeginUpdate( INextBot *bot );
+	void NotifyEndUpdate( INextBot *bot );
+
+	int GetNextBotCount( void ) const;				// How many nextbots are alive right now?
+
+
+	/**
+	 * Populate given vector with all bots in the system
+	 */
+	void CollectAllBots( CUtlVector< INextBot * > *botVector );
+
+
+	/**
+	 * DEPRECATED: Use CollectAllBots().
+	 * Execute functor for each NextBot in the system.
+	 * If a functor returns false, stop iteration early
+	 * and return false.
+	 */	
+	template < typename Functor >
+	bool ForEachBot( Functor &func )
+	{
+		for( int i=m_botList.Head(); i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+		{
+			if ( !func( m_botList[i] ) )
+			{
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * DEPRECATED: Use CollectAllBots().
+	 * Execute functor for each NextBot in the system as 
+	 * a CBaseCombatCharacter.
+	 * If a functor returns false, stop iteration early
+	 * and return false.
+	 */	
+	template < typename Functor >
+	bool ForEachCombatCharacter( Functor &func )
+	{
+		for( int i=m_botList.Head(); i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+		{
+			if ( !func( m_botList[i]->GetEntity() ) )
+			{
+
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	/**
+	 * Return closest bot to given point that passes the given filter
+	 */	
+	template < typename Filter >
+	INextBot *GetClosestBot( const Vector &pos, Filter &filter )
+	{
+		INextBot *close = NULL;
+		float closeRangeSq = FLT_MAX;
+
+		for( int i=m_botList.Head(); i != m_botList.InvalidIndex(); i = m_botList.Next( i ) )
+		{
+			float rangeSq = ( m_botList[i]->GetEntity()->GetAbsOrigin() - pos ).LengthSqr();
+			if ( rangeSq < closeRangeSq && filter( m_botList[i] ) )
+			{
+				closeRangeSq = rangeSq;
+				close = m_botList[i];
+			}
+		}
+
+		return close;
+	}
+
+	/**
+	 * Event propagators
+	 */
+	virtual void OnMapLoaded( void );						// when the server has changed maps
+	virtual void OnRoundRestart( void );					// when the scenario restarts
+	virtual void OnBeginChangeLevel( void );				// when the server is about to change maps
+	virtual void OnKilled( CBaseCombatCharacter *victim, const CTakeDamageInfo &info );	// when an actor is killed
+	virtual void OnSound( CBaseEntity *source, const Vector &pos, KeyValues *keys );				// when an entity emits a sound
+	virtual void OnSpokeConcept( CBaseCombatCharacter *who, AIConcept_t concept, AI_Response *response );	// when an Actor speaks a concept
+	virtual void OnWeaponFired( CBaseCombatCharacter *whoFired, CBaseCombatWeapon *weapon );		// when someone fires a weapon
+
+	/**
+	 * Debugging
+	 */
+	bool IsDebugging( unsigned int type ) const;	// return true if debugging system is on for the given type(s)
+	void SetDebugTypes( NextBotDebugType type );	// start displaying debug info of the given type(s)
+
+	void DebugFilterAdd( int index );				// add given entindex to the debug filter
+	void DebugFilterAdd( const char *name );		// add given name to the debug filter
+	void DebugFilterRemove( int index );			// remove given entindex from the debug filter
+	void DebugFilterRemove( const char *name );		// remove given name from the debug filter
+	void DebugFilterClear( void );					// clear the debug filter (remove all entries)
+	bool IsDebugFilterMatch( const INextBot *bot ) const;	// return true if the given bot matches the debug filter
+
+	void Select( INextBot *bot );					// mark bot as selected for further operations
+	void DeselectAll( void );
+	INextBot *GetSelected( void ) const;
+
+	INextBot *GetBotUnderCrosshair( CBasePlayer *picker );	// Get the bot under the given player's crosshair
+
+	//
+	// Put these in a derived class
+	//
+	void OnSurvivorVomitedUpon( CTerrorPlayer *victim );	// when a Survivor has been hit by Boomer Vomit
+
+	static void SetInstance( NextBotManager *pInstance ) { sInstance = pInstance; };
+	static NextBotManager* GetInstance() { return sInstance; }
+
+protected:
+	static NextBotManager* sInstance;
+
+	friend class INextBot;
+
+	int Register( INextBot *bot );
+	void UnRegister( INextBot *bot );
+
+	CUtlLinkedList< INextBot * > m_botList;				// list of all active NextBots
+
+	int m_iUpdateTickrate;
+	double m_CurUpdateStartTime;
+	double m_SumFrameTime;
+
+	unsigned int m_debugType;						// debug flags
+
+	struct DebugFilter
+	{
+		int index;			// entindex
+		enum { MAX_DEBUG_NAME_SIZE = 128 };
+		char name[ MAX_DEBUG_NAME_SIZE ];
+	};
+	CUtlVector< DebugFilter > m_debugFilterList;
+
+	INextBot *m_selectedBot;						// selected bot for further debug operations
+};
+
+inline int NextBotManager::GetNextBotCount( void ) const
+{
+	return m_botList.Count();
+}
+
+inline bool NextBotManager::IsDebugging( unsigned int type ) const
+{
+	if ( type & m_debugType )
+	{
+		return true;
+	}
+
+	return false;
+}
+
+
+inline void NextBotManager::SetDebugTypes( NextBotDebugType type )
+{
+	m_debugType = (unsigned int)type;
+}
+
+
+inline void NextBotManager::Select( INextBot *bot )
+{
+	m_selectedBot = bot;
+}
+
+inline void NextBotManager::DeselectAll( void )
+{
+	m_selectedBot = NULL;
+}
+
+inline INextBot *NextBotManager::GetSelected( void ) const
+{
+	return m_selectedBot;
+}
+
+
+
+// singleton accessor
+extern NextBotManager &TheNextBots( void );
+
+
+#endif // _NEXT_BOT_MANAGER_H_
+

game/server/NextBot/NextBotUtil.h

@@ -0,0 +1,278 @@
+// NextBotUtil.h
+// Utilities for the NextBot system
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_UTIL_H_
+#define _NEXT_BOT_UTIL_H_
+
+#include "NextBotLocomotionInterface.h"
+#include "nav_area.h"
+#include "nav_mesh.h"
+#include "nav_pathfind.h"
+
+//--------------------------------------------------------------------------------------------
+/**
+ * A simple filter interface for various NextBot queries
+ */
+class INextBotEntityFilter
+{
+public:
+	// return true if the given entity passes this filter
+	virtual bool IsAllowed( CBaseEntity *entity ) const = 0;
+};
+
+
+// trace filter callback functions. needed for use with the querycache/optimization functionality
+bool VisionTraceFilterFunction( IHandleEntity *pServerEntity, int contentsMask );
+bool IgnoreActorsTraceFilterFunction( IHandleEntity *pServerEntity, int contentsMask );
+
+
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that skips all players and NextBots
+ */
+class NextBotTraceFilterIgnoreActors : public CTraceFilterSimple
+{
+public:
+	NextBotTraceFilterIgnoreActors( const IHandleEntity *passentity, int collisionGroup ) : CTraceFilterSimple( passentity, collisionGroup, IgnoreActorsTraceFilterFunction )
+	{
+	}
+};
+
+
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that skips all players, NextBots, and non-LOS blockers
+ */
+class NextBotVisionTraceFilter : public CTraceFilterSimple
+{
+public:
+	NextBotVisionTraceFilter( const IHandleEntity *passentity, int collisionGroup )	: CTraceFilterSimple( passentity, collisionGroup, VisionTraceFilterFunction )
+	{
+	}
+};
+
+
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that skips all NextBots, but includes Players
+ */
+class NextBotTraceFilterIgnoreNextBots : public CTraceFilterSimple
+{
+public:
+	NextBotTraceFilterIgnoreNextBots( const IHandleEntity *passentity, int collisionGroup )
+		: CTraceFilterSimple( passentity, collisionGroup )
+	{
+	}
+
+	virtual bool ShouldHitEntity( IHandleEntity *pServerEntity, int contentsMask )
+	{
+		if ( CTraceFilterSimple::ShouldHitEntity( pServerEntity, contentsMask ) )
+		{
+			CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+#ifdef TERROR
+			CBasePlayer *player = ToBasePlayer( entity );
+			if ( player && player->IsGhost() )
+				return false;
+#endif // TERROR
+
+			return ( entity->MyNextBotPointer() == NULL );
+		}
+		return false;
+	}
+};
+
+
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that obeys INextBot::IsAbleToBlockMovementOf()
+ */
+class NextBotTraceFilter : public CTraceFilterSimple
+{
+public:
+	NextBotTraceFilter( const IHandleEntity *passentity, int collisionGroup )
+		: CTraceFilterSimple( passentity, collisionGroup )
+	{
+		CBaseEntity *entity = const_cast<CBaseEntity *>(EntityFromEntityHandle( passentity ));
+		m_passBot = entity->MyNextBotPointer();
+	}
+
+	virtual bool ShouldHitEntity( IHandleEntity *pServerEntity, int contentsMask )
+	{
+		if ( CTraceFilterSimple::ShouldHitEntity( pServerEntity, contentsMask ) )
+		{
+			CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+#ifdef TERROR
+			CBasePlayer *player = ToBasePlayer( entity );
+			if ( player && player->IsGhost() )
+				return false;
+#endif // TERROR
+
+			// Skip players on the same team - they're not solid to us, and we'll avoid them
+			if ( entity->IsPlayer() && m_passBot && m_passBot->GetEntity() &&
+				m_passBot->GetEntity()->GetTeamNumber() == entity->GetTeamNumber() )
+				return false;
+
+			INextBot *bot = entity->MyNextBotPointer();
+			
+			return ( !bot || bot->IsAbleToBlockMovementOf( m_passBot ) );
+		}
+		return false;
+	}
+	
+	const INextBot *m_passBot;
+};
+
+
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that only hits players and NextBots
+ */
+class NextBotTraceFilterOnlyActors : public CTraceFilterSimple
+{
+public:
+	NextBotTraceFilterOnlyActors( const IHandleEntity *passentity, int collisionGroup )
+		: CTraceFilterSimple( passentity, collisionGroup )
+	{
+	}
+
+	virtual TraceType_t	GetTraceType() const
+	{
+		return TRACE_ENTITIES_ONLY;
+	}
+
+	virtual bool ShouldHitEntity( IHandleEntity *pServerEntity, int contentsMask )
+	{
+		if ( CTraceFilterSimple::ShouldHitEntity( pServerEntity, contentsMask ) )
+		{
+			CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+
+#ifdef TERROR
+			CBasePlayer *player = ToBasePlayer( entity );
+			if ( player && player->IsGhost() )
+				return false;
+#endif // TERROR
+
+			return ( entity->MyNextBotPointer() || entity->IsPlayer() );
+		}
+		return false;
+	}
+};
+
+
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that skips "traversable" entities.  The "when" argument creates
+ * a temporal context for asking if an entity is IMMEDIATELY traversable (like thin
+ * glass that just breaks as we walk through it) or EVENTUALLY traversable (like a
+ * breakable object that will take some time to break through)
+ */
+class NextBotTraversableTraceFilter : public CTraceFilterSimple
+{
+public:
+	NextBotTraversableTraceFilter( INextBot *bot, ILocomotion::TraverseWhenType when = ILocomotion::EVENTUALLY ) : CTraceFilterSimple( bot->GetEntity(), COLLISION_GROUP_NONE )
+	{
+		m_bot = bot;
+		m_when = when;
+	}
+
+	virtual bool ShouldHitEntity( IHandleEntity *pServerEntity, int contentsMask )
+	{
+		CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+
+		if ( m_bot->IsSelf( entity ) )
+		{
+			return false;
+		}
+
+		if ( CTraceFilterSimple::ShouldHitEntity( pServerEntity, contentsMask ) )
+		{
+			return !m_bot->GetLocomotionInterface()->IsEntityTraversable( entity, m_when );
+		}
+
+		return false;
+	}
+
+private:
+	INextBot *m_bot;
+	ILocomotion::TraverseWhenType m_when;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Given a vector of entities, a nav area, and a max travel distance, return 
+ * the entity that has the shortest travel distance.
+ */
+inline CBaseEntity *SelectClosestEntityByTravelDistance( INextBot *me, const CUtlVector< CBaseEntity * > &candidateEntities, CNavArea *startArea, float travelRange )
+{
+	// collect nearby walkable areas within travelRange
+	CUtlVector< CNavArea * > nearbyAreaVector;
+	CollectSurroundingAreas( &nearbyAreaVector, startArea, travelRange, me->GetLocomotionInterface()->GetStepHeight(), me->GetLocomotionInterface()->GetDeathDropHeight() );
+
+	// find closest entity in the collected area set
+	CBaseEntity *closeEntity = NULL;
+	float closeTravelRange = FLT_MAX;
+
+	for( int i=0; i<candidateEntities.Count(); ++i )
+	{
+		CBaseEntity *candidate = candidateEntities[i];
+
+		CNavArea *area = TheNavMesh->GetNearestNavArea( candidate, GETNAVAREA_CHECK_LOS, 500.0f );
+
+		if ( area && area->IsMarked() && area->GetCostSoFar() < closeTravelRange )
+		{
+			closeEntity = candidate;
+			closeTravelRange = area->GetCostSoFar();
+		}
+	}
+
+	return closeEntity;
+}
+
+
+#ifdef OBSOLETE
+//--------------------------------------------------------------------------------------------
+/**
+ * Trace filter that skips "traversable" entities, but hits other Actors.
+ * Used for obstacle avoidance.
+ */
+class NextBotMovementAvoidanceTraceFilter : public CTraceFilterSimple
+{
+public:
+	NextBotMovementAvoidanceTraceFilter( INextBot *bot ) : CTraceFilterSimple( bot->GetEntity(), COLLISION_GROUP_NONE )
+	{
+		m_bot = bot;
+	}
+
+	virtual bool ShouldHitEntity( IHandleEntity *pServerEntity, int contentsMask )
+	{
+		CBaseEntity *entity = EntityFromEntityHandle( pServerEntity );
+
+#ifdef TERROR
+		CBasePlayer *player = ToBasePlayer( entity );
+		if ( player && player->IsGhost() )
+			return false;
+#endif // TERROR
+
+		if ( m_bot->IsSelf( entity ) )
+		{
+			return false;
+		}
+
+		if ( CTraceFilterSimple::ShouldHitEntity( pServerEntity, contentsMask ) )
+		{
+			return !m_bot->GetLocomotionInterface()->IsEntityTraversable( entity, ILocomotion::IMMEDIATELY );
+		}
+
+		return false;
+	}
+
+private:
+	INextBot *m_bot;
+};
+#endif
+
+
+#endif // _NEXT_BOT_UTIL_H_

game/server/NextBot/NextBotVisionInterface.cpp

@@ -0,0 +1,802 @@
+// NextBotVisionInterface.cpp
+// Implementation of common vision system
+// Author: Michael Booth, May 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "nav.h"
+#include "functorutils.h"
+
+#include "NextBot.h"
+#include "NextBotVisionInterface.h"
+#include "NextBotBodyInterface.h"
+#include "NextBotUtil.h"
+
+#ifdef TERROR
+#include "querycache.h"
+#endif
+
+#include "tier0/vprof.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+ConVar nb_blind( "nb_blind", "0", FCVAR_CHEAT, "Disable vision" );
+ConVar nb_debug_known_entities( "nb_debug_known_entities", "0", FCVAR_CHEAT, "Show the 'known entities' for the bot that is the current spectator target" );
+
+
+//------------------------------------------------------------------------------------------
+IVision::IVision( INextBot *bot ) : INextBotComponent( bot )
+{ 
+	Reset();
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Reset to initial state
+ */
+void IVision::Reset( void )
+{
+	INextBotComponent::Reset();
+
+	m_knownEntityVector.RemoveAll();
+	m_lastVisionUpdateTimestamp = 0.0f;
+	m_primaryThreat = NULL;
+
+	m_FOV = GetDefaultFieldOfView();
+	m_cosHalfFOV = cos( 0.5f * m_FOV * M_PI / 180.0f );
+	
+	for( int i=0; i<MAX_TEAMS; ++i )
+	{
+		m_notVisibleTimer[i].Invalidate();
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Ask the current behavior to select the most dangerous threat from
+ * our set of currently known entities
+ * TODO: Find a semantically better place for this to live.
+ */
+const CKnownEntity *IVision::GetPrimaryKnownThreat( bool onlyVisibleThreats ) const
+{
+	if ( m_knownEntityVector.Count() == 0 )
+		return NULL;
+
+	const CKnownEntity *threat = NULL;
+	int i;
+
+	// find the first valid entity
+	for( i=0; i<m_knownEntityVector.Count(); ++i )
+	{
+		const CKnownEntity &firstThreat = m_knownEntityVector[i];
+
+		// check in case status changes between updates
+		if ( IsAwareOf( firstThreat ) && !firstThreat.IsObsolete() && !IsIgnored( firstThreat.GetEntity() ) && GetBot()->IsEnemy( firstThreat.GetEntity() ) )
+		{
+			if ( !onlyVisibleThreats || firstThreat.IsVisibleRecently() )
+			{
+				threat = &firstThreat;
+				break;
+			}
+		}
+	}
+
+	if ( threat == NULL )
+	{
+		m_primaryThreat = NULL;
+		return NULL;
+	}
+
+	for( ++i; i<m_knownEntityVector.Count(); ++i )
+	{
+		const CKnownEntity &newThreat = m_knownEntityVector[i];
+
+		// check in case status changes between updates
+		if ( IsAwareOf( newThreat ) && !newThreat.IsObsolete() && !IsIgnored( newThreat.GetEntity() ) && GetBot()->IsEnemy( newThreat.GetEntity() ) )
+		{
+			if ( !onlyVisibleThreats || newThreat.IsVisibleRecently() )
+			{
+				threat = GetBot()->GetIntentionInterface()->SelectMoreDangerousThreat( GetBot(), GetBot()->GetEntity(), threat, &newThreat );
+			}
+		}
+	}
+
+	// cache off threat
+	m_primaryThreat = threat ? threat->GetEntity() : NULL;
+
+	return threat;
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Return the closest recognized entity
+ */
+const CKnownEntity *IVision::GetClosestKnown( int team ) const
+{
+	const Vector &myPos = GetBot()->GetPosition();
+	
+	const CKnownEntity *close = NULL;
+	float closeRange = 999999999.9f;
+	
+	for( int i=0; i < m_knownEntityVector.Count(); ++i )
+	{
+		const CKnownEntity &known = m_knownEntityVector[i];
+
+		if ( !known.IsObsolete() && IsAwareOf( known ) )
+		{
+			if ( team == TEAM_ANY || known.GetEntity()->GetTeamNumber() == team )
+			{
+				Vector to = known.GetLastKnownPosition() - myPos;
+				float rangeSq = to.LengthSqr();
+				
+				if ( rangeSq < closeRange )
+				{
+					close = &known;
+					closeRange = rangeSq;
+				}
+			}
+		}
+	}
+	
+	return close;
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Return the closest recognized entity that passes the given filter
+ */
+const CKnownEntity *IVision::GetClosestKnown( const INextBotEntityFilter &filter ) const
+{
+	const Vector &myPos = GetBot()->GetPosition();
+
+	const CKnownEntity *close = NULL;
+	float closeRange = 999999999.9f;
+
+	for( int i=0; i < m_knownEntityVector.Count(); ++i )
+	{
+		const CKnownEntity &known = m_knownEntityVector[i];
+
+		if ( !known.IsObsolete() && IsAwareOf( known ) )
+		{
+			if ( filter.IsAllowed( known.GetEntity() ) )
+			{
+				Vector to = known.GetLastKnownPosition() - myPos;
+				float rangeSq = to.LengthSqr();
+
+				if ( rangeSq < closeRange )
+				{
+					close = &known;
+					closeRange = rangeSq;
+				}
+			}
+		}
+	}
+
+	return close;	
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Given an entity, return our known version of it (or NULL if we don't know of it)
+ */
+const CKnownEntity *IVision::GetKnown( const CBaseEntity *entity ) const
+{
+	if ( entity == NULL )
+		return NULL;
+
+	for( int i=0; i < m_knownEntityVector.Count(); ++i )
+	{
+		const CKnownEntity &known = m_knownEntityVector[i];
+
+		if ( known.GetEntity() && known.GetEntity()->entindex() == entity->entindex() && !known.IsObsolete() )
+		{
+			return &known;
+		}
+	}
+
+	return NULL;
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Introduce a known entity into the system. Its position is assumed to be known
+ * and will be updated, and it is assumed to not yet have been seen by us, allowing for learning
+ * of known entities by being told about them, hearing them, etc.
+ */
+void IVision::AddKnownEntity( CBaseEntity *entity )
+{
+	if ( entity == NULL || entity->IsWorld() )
+	{
+		// the world is not an entity we can deal with
+		return;
+	}
+
+	CKnownEntity known( entity );
+
+	// only add it if we don't already know of it
+	if ( m_knownEntityVector.Find( known ) == m_knownEntityVector.InvalidIndex() )
+	{
+		m_knownEntityVector.AddToTail( known );
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+// Remove the given entity from our awareness (whether we know if it or not)
+// Useful if we've moved to where we last saw the entity, but it's not there any longer.
+void IVision::ForgetEntity( CBaseEntity *forgetMe )
+{
+	if ( !forgetMe )
+		return;
+
+	FOR_EACH_VEC( m_knownEntityVector, it )
+	{
+		const CKnownEntity &known = m_knownEntityVector[ it ];
+
+		if ( known.GetEntity() && known.GetEntity()->entindex() == forgetMe->entindex() )
+		{
+			m_knownEntityVector.FastRemove( it );
+			return;
+		}
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+void IVision::ForgetAllKnownEntities( void )
+{
+	m_knownEntityVector.RemoveAll();
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Return the number of entity on the given team known to us closer than rangeLimit
+ */
+int IVision::GetKnownCount( int team, bool onlyVisible, float rangeLimit ) const
+{
+	int count = 0;
+
+	FOR_EACH_VEC( m_knownEntityVector, it )
+	{
+		const CKnownEntity &known = m_knownEntityVector[ it ];
+
+		if ( !known.IsObsolete() && IsAwareOf( known ) )
+		{
+			if ( team == TEAM_ANY || known.GetEntity()->GetTeamNumber() == team )
+			{
+				if ( !onlyVisible || known.IsVisibleRecently() )
+				{
+					if ( rangeLimit < 0.0f || GetBot()->IsRangeLessThan( known.GetLastKnownPosition(), rangeLimit ) )
+					{
+						++count;
+					}
+				}
+			}
+		}
+	}
+
+	return count;
+}
+
+
+//------------------------------------------------------------------------------------------
+class PopulateVisibleVector
+{
+public:
+	PopulateVisibleVector( CUtlVector< CBaseEntity * > *potentiallyVisible )
+	{
+		m_potentiallyVisible = potentiallyVisible;
+	}
+
+	bool operator() ( CBaseEntity *actor )
+	{
+		m_potentiallyVisible->AddToTail( actor );
+		return true;
+	}
+
+	CUtlVector< CBaseEntity * > *m_potentiallyVisible;
+};
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Populate "potentiallyVisible" with the set of all entities we could potentially see. 
+ * Entities in this set will be tested for visibility/recognition in IVision::Update()
+ */
+void IVision::CollectPotentiallyVisibleEntities( CUtlVector< CBaseEntity * > *potentiallyVisible )
+{
+	potentiallyVisible->RemoveAll();
+
+	// by default, only consider players and other bots as potentially visible
+	PopulateVisibleVector populate( potentiallyVisible );
+	ForEachActor( populate );
+}
+
+
+//------------------------------------------------------------------------------------------
+class CollectVisible
+{
+public:
+	CollectVisible( IVision *vision )
+	{
+		m_vision = vision;
+	}
+	
+	bool operator() ( CBaseEntity *entity )
+	{
+		if ( entity &&
+			 !m_vision->IsIgnored( entity ) &&
+			 entity->IsAlive() &&
+			 entity != m_vision->GetBot()->GetEntity() &&
+			 m_vision->IsAbleToSee( entity, IVision::USE_FOV ) )
+		{
+			m_recognized.AddToTail( entity );	
+		}
+			
+		return true;
+	}
+	
+	bool Contains( CBaseEntity *entity ) const
+	{
+		for( int i=0; i < m_recognized.Count(); ++i )
+		{
+			if ( entity->entindex() == m_recognized[ i ]->entindex() )
+			{
+				return true;
+			}
+		}
+		return false;
+	}
+	
+	IVision *m_vision;
+	CUtlVector< CBaseEntity * > m_recognized;
+};
+
+
+//------------------------------------------------------------------------------------------
+void IVision::UpdateKnownEntities( void )
+{
+	VPROF_BUDGET( "IVision::UpdateKnownEntities", "NextBot" );
+
+	// construct set of potentially visible objects
+	CUtlVector< CBaseEntity * > potentiallyVisible;
+	CollectPotentiallyVisibleEntities( &potentiallyVisible );
+
+	// collect set of visible and recognized entities at this moment
+	CollectVisible visibleNow( this );
+	FOR_EACH_VEC( potentiallyVisible, pit )
+	{
+		VPROF_BUDGET( "IVision::UpdateKnownEntities( collect visible )", "NextBot" );
+
+		if ( visibleNow( potentiallyVisible[ pit ] ) == false )
+			break;
+	}
+	
+	// update known set with new data
+	{	VPROF_BUDGET( "IVision::UpdateKnownEntities( update status )", "NextBot" );
+
+		int i;
+		for( i=0; i < m_knownEntityVector.Count(); ++i )
+		{
+			CKnownEntity &known = m_knownEntityVector[i];
+
+			// clear out obsolete knowledge
+			if ( known.GetEntity() == NULL || known.IsObsolete() )
+			{
+				m_knownEntityVector.Remove( i );
+				--i;
+				continue;
+			}
+			
+			if ( visibleNow.Contains( known.GetEntity() ) )
+			{
+				// this visible entity was already known (but perhaps not visible until now)
+				known.UpdatePosition();
+				known.UpdateVisibilityStatus( true );
+
+				// has our reaction time just elapsed?
+				if ( gpGlobals->curtime - known.GetTimeWhenBecameVisible() >= GetMinRecognizeTime() &&
+					 m_lastVisionUpdateTimestamp - known.GetTimeWhenBecameVisible() < GetMinRecognizeTime() )
+				{
+					if ( GetBot()->IsDebugging( NEXTBOT_VISION ) )
+					{
+						ConColorMsg( Color( 0, 255, 0, 255 ), "%3.2f: %s caught sight of %s(#%d)\n", 
+										gpGlobals->curtime,
+										GetBot()->GetDebugIdentifier(),
+										known.GetEntity()->GetClassname(),
+										known.GetEntity()->entindex() );
+
+						NDebugOverlay::Line( GetBot()->GetBodyInterface()->GetEyePosition(), known.GetLastKnownPosition(), 255, 255, 0, false, 0.2f );
+					}
+
+					GetBot()->OnSight( known.GetEntity() );
+				}
+		
+				// restart 'not seen' timer
+				m_notVisibleTimer[ known.GetEntity()->GetTeamNumber() ].Start();
+			}
+			else // known entity is not currently visible
+			{
+				if ( known.IsVisibleInFOVNow() )
+				{
+					// previously known and visible entity is now no longer visible
+					known.UpdateVisibilityStatus( false );
+
+					// lost sight of this entity
+					if ( GetBot()->IsDebugging( NEXTBOT_VISION ) )
+					{
+						ConColorMsg( Color( 255, 0, 0, 255 ), "%3.2f: %s Lost sight of %s(#%d)\n", 
+										gpGlobals->curtime,
+										GetBot()->GetDebugIdentifier(),
+										known.GetEntity()->GetClassname(),
+										known.GetEntity()->entindex() );
+					}
+
+					GetBot()->OnLostSight( known.GetEntity() );
+				}
+
+				if ( !known.HasLastKnownPositionBeenSeen() )
+				{
+					// can we see the entity's last know position?
+					if ( IsAbleToSee( known.GetLastKnownPosition(), IVision::USE_FOV ) )
+					{
+						known.MarkLastKnownPositionAsSeen();
+					}
+				}
+			}
+		}
+	}
+		
+	// check for new recognizes that were not in the known set
+	{	VPROF_BUDGET( "IVision::UpdateKnownEntities( new recognizes )", "NextBot" );
+
+		int i, j;
+		for( i=0; i < visibleNow.m_recognized.Count(); ++i )
+		{	
+			for( j=0; j < m_knownEntityVector.Count(); ++j )
+			{
+				if ( visibleNow.m_recognized[i] == m_knownEntityVector[j].GetEntity() )
+				{
+					break;
+				}
+			}
+			
+			if ( j == m_knownEntityVector.Count() )
+			{
+				// recognized a previously unknown entity (emit OnSight() event after reaction time has passed)
+				CKnownEntity known( visibleNow.m_recognized[i] );
+				known.UpdatePosition();
+				known.UpdateVisibilityStatus( true );
+				m_knownEntityVector.AddToTail( known );
+			}
+		}
+	}
+
+	// debugging
+	if ( nb_debug_known_entities.GetBool() )
+	{
+		CBasePlayer *watcher = UTIL_GetListenServerHost();
+		if ( watcher )
+		{
+			CBaseEntity *subject = watcher->GetObserverTarget();
+
+			if ( subject && GetBot()->IsSelf( subject ) )
+			{
+				CUtlVector< CKnownEntity > knownVector;
+				CollectKnownEntities( &knownVector );
+
+				for( int i=0; i < knownVector.Count(); ++i )
+				{
+					CKnownEntity &known = knownVector[i];
+
+					if ( GetBot()->IsFriend( known.GetEntity() ) )
+					{
+						if ( IsAwareOf( known ) )
+						{
+							if ( known.IsVisibleInFOVNow() )
+								NDebugOverlay::HorzArrow( GetBot()->GetEntity()->GetAbsOrigin(), known.GetLastKnownPosition(), 5.0f, 0, 255, 0, 255, true, NDEBUG_PERSIST_TILL_NEXT_SERVER );
+							else
+								NDebugOverlay::HorzArrow( GetBot()->GetEntity()->GetAbsOrigin(), known.GetLastKnownPosition(), 2.0f, 0, 100, 0, 255, true, NDEBUG_PERSIST_TILL_NEXT_SERVER );
+						}
+						else
+						{
+							NDebugOverlay::HorzArrow( GetBot()->GetEntity()->GetAbsOrigin(), known.GetLastKnownPosition(), 1.0f, 0, 100, 0, 128, true, NDEBUG_PERSIST_TILL_NEXT_SERVER );
+						}
+					}
+					else
+					{
+						if ( IsAwareOf( known ) )
+						{
+							if ( known.IsVisibleInFOVNow() )
+								NDebugOverlay::HorzArrow( GetBot()->GetEntity()->GetAbsOrigin(), known.GetLastKnownPosition(), 5.0f, 255, 0, 0, 255, true, NDEBUG_PERSIST_TILL_NEXT_SERVER );
+							else
+								NDebugOverlay::HorzArrow( GetBot()->GetEntity()->GetAbsOrigin(), known.GetLastKnownPosition(), 2.0f, 100, 0, 0, 255, true, NDEBUG_PERSIST_TILL_NEXT_SERVER );
+						}
+						else
+						{
+							NDebugOverlay::HorzArrow( GetBot()->GetEntity()->GetAbsOrigin(), known.GetLastKnownPosition(), 1.0f, 100, 0, 0, 128, true, NDEBUG_PERSIST_TILL_NEXT_SERVER );
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Update internal state
+ */
+void IVision::Update( void )
+{
+	VPROF_BUDGET( "IVision::Update", "NextBotExpensive" );
+
+/* This adds significantly to bot's reaction times
+	// throttle update rate
+	if ( !m_scanTimer.IsElapsed() )
+	{
+		return;
+	}
+
+	m_scanTimer.Start( 0.5f * GetMinRecognizeTime() );
+*/
+
+	if ( nb_blind.GetBool() )
+	{
+		m_knownEntityVector.RemoveAll();
+		return;
+	}
+
+	UpdateKnownEntities();
+
+	m_lastVisionUpdateTimestamp = gpGlobals->curtime;
+}
+
+
+//------------------------------------------------------------------------------------------
+bool IVision::IsAbleToSee( CBaseEntity *subject, FieldOfViewCheckType checkFOV, Vector *visibleSpot ) const
+{
+	VPROF_BUDGET( "IVision::IsAbleToSee", "NextBotExpensive" );
+
+	if ( GetBot()->IsRangeGreaterThan( subject, GetMaxVisionRange() ) )
+	{
+		return false;
+	}
+
+	
+	if ( GetBot()->GetEntity()->IsHiddenByFog( subject ) )
+	{
+		// lost in the fog
+		return false;
+	}
+
+	if ( checkFOV == USE_FOV && !IsInFieldOfView( subject ) )
+	{
+		return false;
+	}
+
+	CBaseCombatCharacter *combat = subject->MyCombatCharacterPointer();
+	if ( combat )
+	{
+		CNavArea *subjectArea = combat->GetLastKnownArea();
+		CNavArea *myArea = GetBot()->GetEntity()->GetLastKnownArea();
+		if ( myArea && subjectArea )
+		{
+			if ( !myArea->IsPotentiallyVisible( subjectArea ) )
+			{
+				// subject is not potentially visible, skip the expensive raycast
+				return false;
+			}
+		}
+	}
+
+	// do actual line-of-sight trace
+	if ( !IsLineOfSightClearToEntity( subject ) )
+	{
+		return false;
+	}
+
+	return IsVisibleEntityNoticed( subject );
+}
+
+
+//------------------------------------------------------------------------------------------
+bool IVision::IsAbleToSee( const Vector &pos, FieldOfViewCheckType checkFOV ) const
+{
+	VPROF_BUDGET( "IVision::IsAbleToSee", "NextBotExpensive" );
+
+	
+	if ( GetBot()->IsRangeGreaterThan( pos, GetMaxVisionRange() ) )
+	{
+		return false;
+	}
+
+	if ( GetBot()->GetEntity()->IsHiddenByFog( pos ) )
+	{
+		// lost in the fog
+		return false;
+	}
+
+	if ( checkFOV == USE_FOV && !IsInFieldOfView( pos ) )
+	{
+		return false;
+	}
+
+	// do actual line-of-sight trace	
+	return IsLineOfSightClear( pos );
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Angle given in degrees
+ */
+void IVision::SetFieldOfView( float horizAngle )
+{
+	m_FOV = horizAngle;
+	m_cosHalfFOV = cos( 0.5f * m_FOV * M_PI / 180.0f );
+}
+
+
+//------------------------------------------------------------------------------------------
+bool IVision::IsInFieldOfView( const Vector &pos ) const
+{
+#ifdef CHECK_OLD_CODE_AGAINST_NEW
+	bool bCheck = PointWithinViewAngle( GetBot()->GetBodyInterface()->GetEyePosition(), pos, GetBot()->GetBodyInterface()->GetViewVector(), m_cosHalfFOV );
+	Vector to = pos - GetBot()->GetBodyInterface()->GetEyePosition();
+	to.NormalizeInPlace();
+	
+	float cosDiff = DotProduct( GetBot()->GetBodyInterface()->GetViewVector(), to );
+	
+	if ( ( cosDiff > m_cosHalfFOV ) != bCheck )
+	{
+		Assert(0);
+		bool bCheck2 =
+			PointWithinViewAngle( GetBot()->GetBodyInterface()->GetEyePosition(), pos, GetBot()->GetBodyInterface()->GetViewVector(), m_cosHalfFOV );
+
+	}
+
+	return ( cosDiff > m_cosHalfFOV );
+#else
+	return PointWithinViewAngle( GetBot()->GetBodyInterface()->GetEyePosition(), pos, GetBot()->GetBodyInterface()->GetViewVector(), m_cosHalfFOV );
+#endif
+	
+	return true;
+}
+
+
+//------------------------------------------------------------------------------------------
+bool IVision::IsInFieldOfView( CBaseEntity *subject ) const
+{
+	/// @todo check more points
+	if ( IsInFieldOfView( subject->WorldSpaceCenter() ) )
+	{
+		return true;
+	}
+
+	return IsInFieldOfView( subject->EyePosition() );
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Return true if the ray to the given point is unobstructed
+ */
+bool IVision::IsLineOfSightClear( const Vector &pos ) const
+{
+	VPROF_BUDGET( "IVision::IsLineOfSightClear", "NextBot" );
+	VPROF_INCREMENT_COUNTER( "IVision::IsLineOfSightClear", 1 );
+
+	trace_t result;
+	NextBotVisionTraceFilter filter( GetBot()->GetEntity(), COLLISION_GROUP_NONE );
+	
+	UTIL_TraceLine( GetBot()->GetBodyInterface()->GetEyePosition(), pos, MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, &filter, &result );
+	
+	return ( result.fraction >= 1.0f && !result.startsolid );
+}
+
+
+//------------------------------------------------------------------------------------------
+bool IVision::IsLineOfSightClearToEntity( const CBaseEntity *subject, Vector *visibleSpot ) const
+{
+#ifdef TERROR
+	// TODO: Integration querycache & its dependencies
+
+	VPROF_INCREMENT_COUNTER( "IVision::IsLineOfSightClearToEntity", 1 );
+	VPROF_BUDGET( "IVision::IsLineOfSightClearToEntity", "NextBotSpiky" );
+
+	bool bClear = IsLineOfSightBetweenTwoEntitiesClear( GetBot()->GetBodyInterface()->GetEntity(), EOFFSET_MODE_EYEPOSITION,
+														subject, EOFFSET_MODE_WORLDSPACE_CENTER,
+														subject, COLLISION_GROUP_NONE,
+														MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, VisionTraceFilterFunction, 1.0 );
+
+#ifdef USE_NON_CACHE_QUERY
+	trace_t result;
+	NextBotTraceFilterIgnoreActors filter( subject, COLLISION_GROUP_NONE );
+	
+	UTIL_TraceLine( GetBot()->GetBodyInterface()->GetEyePosition(), subject->WorldSpaceCenter(), MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, &filter, &result );
+	Assert( result.DidHit() != bClear );
+	if ( subject->IsPlayer() && ! bClear )
+	{
+		UTIL_TraceLine( GetBot()->GetBodyInterface()->GetEyePosition(), subject->EyePosition(), MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, &filter, &result );
+		bClear = IsLineOfSightBetweenTwoEntitiesClear( GetBot()->GetEntity(),
+													   EOFFSET_MODE_EYEPOSITION,
+													   subject, EOFFSET_MODE_EYEPOSITION,
+													   subject, COLLISION_GROUP_NONE,
+													   MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, 
+													   IgnoreActorsTraceFilterFunction, 1.0 );
+
+		// this WILL assert - the query interface happens at a different time, and has hysteresis.
+		Assert( result.DidHit() != bClear );
+	}
+#endif
+
+	return bClear;
+
+#else
+
+	// TODO: Use plain-old traces until querycache/etc gets integrated
+	VPROF_BUDGET( "IVision::IsLineOfSightClearToEntity", "NextBot" );
+
+	trace_t result;
+	NextBotTraceFilterIgnoreActors filter( subject, COLLISION_GROUP_NONE );
+
+	UTIL_TraceLine( GetBot()->GetBodyInterface()->GetEyePosition(), subject->WorldSpaceCenter(), MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, &filter, &result );
+	if ( result.DidHit() )
+	{
+		UTIL_TraceLine( GetBot()->GetBodyInterface()->GetEyePosition(), subject->EyePosition(), MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, &filter, &result );
+
+		if ( result.DidHit() )
+		{
+			UTIL_TraceLine( GetBot()->GetBodyInterface()->GetEyePosition(), subject->GetAbsOrigin(), MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, &filter, &result );
+		}
+	}
+
+	if ( visibleSpot )
+	{
+		*visibleSpot = result.endpos;
+	}
+
+	return ( result.fraction >= 1.0f && !result.startsolid );
+
+#endif
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Are we looking directly at the given position
+ */
+bool IVision::IsLookingAt( const Vector &pos, float cosTolerance ) const
+{
+	Vector to = pos - GetBot()->GetBodyInterface()->GetEyePosition();
+	to.NormalizeInPlace();
+
+	Vector forward;
+	AngleVectors( GetBot()->GetEntity()->EyeAngles(), &forward );
+
+	return DotProduct( to, forward ) > cosTolerance;
+}
+
+
+//------------------------------------------------------------------------------------------
+/**
+ * Are we looking directly at the given actor
+ */
+bool IVision::IsLookingAt( const CBaseCombatCharacter *actor, float cosTolerance ) const
+{
+	return IsLookingAt( actor->EyePosition(), cosTolerance );
+}
+
+

game/server/NextBot/NextBotVisionInterface.h

@@ -0,0 +1,226 @@
+// NextBotVisionInterface.h
+// Visual information query interface for bots
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_VISION_INTERFACE_H_
+#define _NEXT_BOT_VISION_INTERFACE_H_
+
+#include "NextBotComponentInterface.h"
+#include "NextBotKnownEntity.h"
+
+class IBody;
+class INextBotEntityFilter;
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for HOW the bot sees (near sighted? night vision? etc)
+ */
+class IVision : public INextBotComponent
+{
+public:
+	IVision( INextBot *bot );
+	virtual ~IVision() { }
+
+	virtual void Reset( void );									// reset to initial state
+	virtual void Update( void );								// update internal state
+
+	//-- attention/short term memory interface follows ------------------------------------------
+
+	//
+	// WARNING: Do not keep CKnownEntity pointers returned by these methods, as they can be invalidated/freed 
+	//
+
+	/**
+	 * Iterate each interesting entity we are aware of.
+	 * If functor returns false, stop iterating and return false.
+	 * NOTE: known.GetEntity() is guaranteed to be non-NULL
+	 */
+	class IForEachKnownEntity
+	{
+	public:
+		virtual bool Inspect( const CKnownEntity &known ) = 0;
+	};
+	virtual bool ForEachKnownEntity( IForEachKnownEntity &func );
+
+	virtual void CollectKnownEntities( CUtlVector< CKnownEntity > *knownVector );	// populate given vector with all currently known entities
+
+	virtual const CKnownEntity *GetPrimaryKnownThreat( bool onlyVisibleThreats = false ) const;	// return the biggest threat to ourselves that we are aware of
+	virtual float GetTimeSinceVisible( int team ) const;				// return time since we saw any member of the given team
+
+	virtual const CKnownEntity *GetClosestKnown( int team = TEAM_ANY ) const;	// return the closest known entity
+	virtual int GetKnownCount( int team, bool onlyVisible = false, float rangeLimit = -1.0f ) const;		// return the number of entities on the given team known to us closer than rangeLimit
+
+	virtual const CKnownEntity *GetClosestKnown( const INextBotEntityFilter &filter ) const;	// return the closest known entity that passes the given filter
+
+	virtual const CKnownEntity *GetKnown( const CBaseEntity *entity ) const;		// given an entity, return our known version of it (or NULL if we don't know of it)
+
+	// Introduce a known entity into the system. Its position is assumed to be known
+	// and will be updated, and it is assumed to not yet have been seen by us, allowing for learning
+	// of known entities by being told about them, hearing them, etc.
+	virtual void AddKnownEntity( CBaseEntity *entity );
+
+	virtual void ForgetEntity( CBaseEntity *forgetMe );			// remove the given entity from our awareness (whether we know if it or not)
+	virtual void ForgetAllKnownEntities( void );
+
+	//-- physical vision interface follows ------------------------------------------------------
+
+	/**
+	 * Populate "potentiallyVisible" with the set of all entities we could potentially see. 
+	 * Entities in this set will be tested for visibility/recognition in IVision::Update()
+	 */
+	virtual void CollectPotentiallyVisibleEntities( CUtlVector< CBaseEntity * > *potentiallyVisible );
+
+	virtual float GetMaxVisionRange( void ) const;				// return maximum distance vision can reach
+	virtual float GetMinRecognizeTime( void ) const;			// return VISUAL reaction time
+
+	/**
+	 * IsAbleToSee() returns true if the viewer can ACTUALLY SEE the subject or position,
+	 * taking into account blindness, smoke effects, invisibility, etc.
+	 * If 'visibleSpot' is non-NULL, the highest priority spot on the subject that is visible is returned.
+	 */ 
+	enum FieldOfViewCheckType { USE_FOV, DISREGARD_FOV };
+	virtual bool IsAbleToSee( CBaseEntity *subject, FieldOfViewCheckType checkFOV, Vector *visibleSpot = NULL ) const;
+	virtual bool IsAbleToSee( const Vector &pos, FieldOfViewCheckType checkFOV ) const;
+
+	virtual bool IsIgnored( CBaseEntity *subject ) const;		// return true to completely ignore this entity (may not be in sight when this is called)
+	virtual bool IsVisibleEntityNoticed( CBaseEntity *subject ) const;		// return true if we 'notice' the subject, even though we have LOS to it
+
+	/**
+	 * Check if 'subject' is within the viewer's field of view
+	 */
+	virtual bool IsInFieldOfView( const Vector &pos ) const;
+	virtual bool IsInFieldOfView( CBaseEntity *subject ) const;
+	virtual float GetDefaultFieldOfView( void ) const;			// return default FOV in degrees
+	virtual float GetFieldOfView( void ) const;					// return FOV in degrees
+	virtual void SetFieldOfView( float horizAngle );			// angle given in degrees
+
+	virtual bool IsLineOfSightClear( const Vector &pos ) const;	// return true if the ray to the given point is unobstructed
+
+	/**
+	 * Returns true if the ray between the position and the subject is unobstructed.
+	 * A visible spot on the subject is returned in 'visibleSpot'.
+	 */
+	virtual bool IsLineOfSightClearToEntity( const CBaseEntity *subject, Vector *visibleSpot = NULL ) const;
+
+	/// @todo: Implement LookAt system
+	virtual bool IsLookingAt( const Vector &pos, float cosTolerance = 0.95f ) const;					// are we looking at the given position
+	virtual bool IsLookingAt( const CBaseCombatCharacter *actor, float cosTolerance = 0.95f ) const;	// are we looking at the given actor
+
+private:
+	CountdownTimer m_scanTimer;			// for throttling update rate
+	
+	float m_FOV;						// current FOV in degrees
+	float m_cosHalfFOV;					// the cosine of FOV/2
+	
+	CUtlVector< CKnownEntity > m_knownEntityVector;		// the set of enemies/friends we are aware of
+	void UpdateKnownEntities( void );
+	bool IsAwareOf( const CKnownEntity &known ) const;	// return true if our reaction time has passed for this entity
+	mutable CHandle< CBaseEntity > m_primaryThreat;
+
+	float m_lastVisionUpdateTimestamp;
+	IntervalTimer m_notVisibleTimer[ MAX_TEAMS ];		// for tracking interval since last saw a member of the given team
+};
+
+inline void IVision::CollectKnownEntities( CUtlVector< CKnownEntity > *knownVector )
+{
+	if ( knownVector )
+	{
+		knownVector->RemoveAll();
+
+		for( int i=0; i<m_knownEntityVector.Count(); ++i )
+		{
+			if ( !m_knownEntityVector[i].IsObsolete() )
+			{
+				knownVector->AddToTail( m_knownEntityVector[i] );
+			}
+		}
+	}
+}
+
+inline float IVision::GetDefaultFieldOfView( void ) const
+{
+	return 90.0f;
+}
+
+inline float IVision::GetFieldOfView( void ) const
+{
+	return m_FOV;
+}
+
+
+inline float IVision::GetTimeSinceVisible( int team ) const
+{
+	if ( team == TEAM_ANY )
+	{
+		// return minimum time	
+		float time = 9999999999.9f;
+		for( int i=0; i<MAX_TEAMS; ++i )
+		{
+			if ( m_notVisibleTimer[i].HasStarted() )
+			{
+				if ( time > m_notVisibleTimer[i].GetElapsedTime() )
+				{
+					team = m_notVisibleTimer[i].GetElapsedTime();
+				}
+			}
+		}
+		return time;
+	}
+	
+	if ( team >= 0 && team < MAX_TEAMS )
+	{
+		return m_notVisibleTimer[ team ].GetElapsedTime();
+	}
+	
+	return 0.0f;
+}
+
+
+inline bool IVision::IsAwareOf( const CKnownEntity &known ) const
+{
+	return known.GetTimeSinceBecameKnown() >= GetMinRecognizeTime();
+}
+
+
+inline bool IVision::ForEachKnownEntity( IVision::IForEachKnownEntity &func )
+{
+	for( int i=0; i<m_knownEntityVector.Count(); ++i )
+	{
+		const CKnownEntity &known = m_knownEntityVector[i];
+
+		if ( !known.IsObsolete() && IsAwareOf( known ) )
+		{
+			if ( func.Inspect( known ) == false )
+			{
+				return false;
+			}
+		}
+	}
+	
+	return true;
+}
+
+inline bool IVision::IsVisibleEntityNoticed( CBaseEntity *subject ) const
+{
+	return true;
+}
+
+inline bool IVision::IsIgnored( CBaseEntity *subject ) const
+{
+	return false;
+}
+
+inline float IVision::GetMaxVisionRange( void ) const
+{
+	return 2000.0f;
+}
+
+inline float IVision::GetMinRecognizeTime( void ) const
+{
+	return 0.0f;
+}
+
+
+#endif // _NEXT_BOT_VISION_INTERFACE_H_

game/server/NextBot/Path/NextBotChasePath.cpp

@@ -0,0 +1,166 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+//=============================================================================
+
+#include "cbase.h"
+
+#include "NextBotChasePath.h"
+#include "tier1/fmtstr.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Try to cutoff our chase subject
+ */
+Vector ChasePath::PredictSubjectPosition( INextBot *bot, CBaseEntity *subject ) const
+{
+	ILocomotion *mover = bot->GetLocomotionInterface();
+
+	const Vector &subjectPos = subject->GetAbsOrigin();
+
+	Vector to = subjectPos - bot->GetPosition();
+	to.z = 0.0f;
+	float flRangeSq = to.LengthSqr();
+
+	// don't lead if subject is very far away
+	float flLeadRadiusSq = GetLeadRadius();
+	flLeadRadiusSq *= flLeadRadiusSq;
+	if ( flRangeSq > flLeadRadiusSq )
+		return subjectPos;
+
+	// Normalize in place
+	float range = sqrt( flRangeSq );
+	to /= ( range + 0.0001f );	// avoid divide by zero
+
+	// estimate time to reach subject, assuming maximum speed
+	float leadTime = 0.5f + ( range / ( mover->GetRunSpeed() + 0.0001f ) );
+	
+	// estimate amount to lead the subject	
+	Vector lead = leadTime * subject->GetAbsVelocity();
+	lead.z = 0.0f;
+
+	if ( DotProduct( to, lead ) < 0.0f )
+	{
+		// the subject is moving towards us - only pay attention 
+		// to his perpendicular velocity for leading
+		Vector2D to2D = to.AsVector2D();
+		to2D.NormalizeInPlace();
+
+		Vector2D perp( -to2D.y, to2D.x );
+
+		float enemyGroundSpeed = lead.x * perp.x + lead.y * perp.y;
+
+		lead.x = enemyGroundSpeed * perp.x;
+		lead.y = enemyGroundSpeed * perp.y;
+	}
+
+	// compute our desired destination
+	Vector pathTarget = subjectPos + lead;
+
+	// validate this destination
+
+	// don't lead through walls
+	if ( lead.LengthSqr() > 36.0f )
+	{
+		float fraction;
+		if ( !mover->IsPotentiallyTraversable( subjectPos, pathTarget, ILocomotion::IMMEDIATELY, &fraction ) )
+		{
+			// tried to lead through an unwalkable area - clip to walkable space
+			pathTarget = subjectPos + fraction * ( pathTarget - subjectPos );
+		}
+	}
+
+	// don't lead over cliffs
+	CNavArea *leadArea = NULL;
+
+#ifdef NEED_GPGLOBALS_SERVERCOUNT_TO_DO_THIS
+	CBaseCombatCharacter *pBCC = subject->MyCombatCharacterPointer();
+	if ( pBCC && CloseEnough( pathTarget, subjectPos, 3.0 ) )
+	{
+		pathTarget = subjectPos;
+		leadArea = pBCC->GetLastKnownArea(); // can return null?
+	}
+	else
+	{
+		struct CacheEntry_t
+		{
+			CacheEntry_t() : pArea(NULL) {}
+			Vector target;
+			CNavArea *pArea;
+		};
+
+		static int iServer;
+		static CacheEntry_t cache[4];
+		static int iNext;
+		int i;
+
+		bool bFound = false;
+		if ( iServer != gpGlobals->serverCount )
+		{
+			for ( i = 0; i < ARRAYSIZE(cache); i++ )
+			{
+				cache[i].pArea = NULL;
+			}
+			iServer = gpGlobals->serverCount;
+		}
+		else
+		{
+			for ( i = 0; i < ARRAYSIZE(cache); i++ )
+			{
+				if ( cache[i].pArea && CloseEnough( cache[i].target, pathTarget, 2.0 ) )
+				{
+					pathTarget = cache[i].target;
+					leadArea = cache[i].pArea;
+					bFound = true;
+					break;
+				}
+			}
+		}
+
+		if ( !bFound )
+		{
+			leadArea = TheNavMesh->GetNearestNavArea( pathTarget );
+			if ( leadArea )
+			{
+				cache[iNext].target = pathTarget;
+				cache[iNext].pArea = leadArea;
+				iNext = ( iNext + 1 ) % ARRAYSIZE( cache );
+			}
+		}
+	}
+#else
+	leadArea = TheNavMesh->GetNearestNavArea( pathTarget );
+#endif
+
+
+	if ( !leadArea || leadArea->GetZ( pathTarget.x, pathTarget.y ) < pathTarget.z - mover->GetMaxJumpHeight() )
+	{
+		// would fall off a cliff
+		return subjectPos;		
+	}
+	
+	/** This needs more thought - it is preventing bots from using dropdowns
+	if ( mover->HasPotentialGap( subjectPos, pathTarget, &fraction ) )
+	{
+		// tried to lead over a cliff - clip to safe region
+		pathTarget = subjectPos + fraction * ( pathTarget - subjectPos );
+	}
+	*/
+	
+	return pathTarget;
+}
+
+// if the victim is a player, poke them so they know they're being chased
+void DirectChasePath::NotifyVictim( INextBot *me, CBaseEntity *victim )
+{
+	CBaseCombatCharacter *pBCCVictim = ToBaseCombatCharacter( victim );
+	if ( !pBCCVictim )
+		return;
+	
+	pBCCVictim->OnPursuedBy( me );
+}

game/server/NextBot/Path/NextBotChasePath.h

@@ -0,0 +1,376 @@
+// NextBotChasePath.h
+// Maintain and follow a "chase path" to a selected Actor
+// Author: Michael Booth, September 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_CHASE_PATH_
+#define _NEXT_BOT_CHASE_PATH_
+
+#include "nav.h"
+#include "NextBotInterface.h"
+#include "NextBotLocomotionInterface.h"
+#include "NextBotChasePath.h"
+#include "NextBotUtil.h"
+#include "NextBotPathFollow.h"
+#include "tier0/vprof.h"
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * A ChasePath extends a PathFollower to periodically recompute a path to a chase
+ * subject, and to move along the path towards that subject.
+ */
+class ChasePath : public PathFollower
+{
+public:
+	enum SubjectChaseType
+	{
+		LEAD_SUBJECT,
+		DONT_LEAD_SUBJECT
+	};
+	ChasePath( SubjectChaseType chaseHow = DONT_LEAD_SUBJECT );
+
+	virtual ~ChasePath() { }
+
+	virtual void Update( INextBot *bot, CBaseEntity *subject, const IPathCost &cost, Vector *pPredictedSubjectPos = NULL );	// update path to chase target and move bot along path
+
+	virtual float GetLeadRadius( void ) const;			// range where movement leading begins - beyond this just head right for the subject
+	virtual float GetMaxPathLength( void ) const;		// return maximum path length
+	virtual Vector PredictSubjectPosition( INextBot *bot, CBaseEntity *subject ) const;	// try to cutoff our chase subject, knowing our relative positions and velocities
+	virtual bool IsRepathNeeded( INextBot *bot, CBaseEntity *subject ) const;			// return true if situation has changed enough to warrant recomputing the current path
+
+	virtual float GetLifetime( void ) const;			// Return duration this path is valid. Path will become invalid at its earliest opportunity once this duration elapses. Zero = infinite lifetime
+
+	virtual void Invalidate( void );					// (EXTEND) cause the path to become invalid
+
+private:
+	void RefreshPath( INextBot *bot, CBaseEntity *subject, const IPathCost &cost, Vector *pPredictedSubjectPos );
+
+	CountdownTimer m_failTimer;							// throttle re-pathing if last path attempt failed
+	CountdownTimer m_throttleTimer;						// require a minimum time between re-paths
+	CountdownTimer m_lifetimeTimer;
+	EHANDLE m_lastPathSubject;							// the subject used to compute the current/last path
+	SubjectChaseType m_chaseHow;
+};
+
+inline ChasePath::ChasePath( SubjectChaseType chaseHow )
+{
+	m_failTimer.Invalidate();
+	m_throttleTimer.Invalidate();
+	m_lifetimeTimer.Invalidate();
+	m_lastPathSubject = NULL;
+	m_chaseHow = chaseHow;
+}
+
+inline float ChasePath::GetLeadRadius( void ) const 
+{ 
+	return 500.0f; // 1000.0f; 
+}
+
+inline float ChasePath::GetMaxPathLength( void ) const
+{
+	// no limit
+	return 0.0f;
+}
+
+inline float ChasePath::GetLifetime( void ) const
+{
+	// infinite duration
+	return 0.0f;
+}
+
+inline void ChasePath::Invalidate( void )
+{
+	// path is gone, repath at earliest opportunity
+	m_throttleTimer.Invalidate();
+	m_lifetimeTimer.Invalidate();
+
+	// extend
+	PathFollower::Invalidate();	
+}
+
+
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Maintain a path to our chase subject and move along that path
+ */
+inline void ChasePath::Update( INextBot *bot, CBaseEntity *subject, const IPathCost &cost, Vector *pPredictedSubjectPos )
+{
+	VPROF_BUDGET( "ChasePath::Update", "NextBot" );
+
+	// maintain the path to the subject
+	RefreshPath( bot, subject, cost, pPredictedSubjectPos );
+
+	// move along the path towards the subject
+	PathFollower::Update( bot );
+}
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Return true if situation has changed enough to warrant recomputing the current path
+ */
+inline bool ChasePath::IsRepathNeeded( INextBot *bot, CBaseEntity *subject ) const
+{
+	// the closer we get, the more accurate our path needs to be
+	Vector to = subject->GetAbsOrigin() - bot->GetPosition();
+
+	const float minTolerance = 0.0f; // 25.0f;
+	const float toleranceRate = 0.33f; // 1.0f; // 0.15f;
+
+	float tolerance = minTolerance + toleranceRate * to.Length();
+
+	return ( subject->GetAbsOrigin() - GetEndPosition() ).IsLengthGreaterThan( tolerance );
+}
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Periodically rebuild the path to our victim
+ */
+inline void ChasePath::RefreshPath( INextBot *bot, CBaseEntity *subject, const IPathCost &cost, Vector *pPredictedSubjectPos )
+{
+	VPROF_BUDGET( "ChasePath::RefreshPath", "NextBot" );
+
+	ILocomotion *mover = bot->GetLocomotionInterface();
+
+	// don't change our path if we're on a ladder
+	if ( IsValid() && mover->IsUsingLadder() )
+	{
+		if ( bot->IsDebugging( NEXTBOT_PATH ) )
+		{
+			DevMsg( "%3.2f: bot(#%d) ChasePath::RefreshPath failed. Bot is on a ladder.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+		}
+
+		// don't allow repath until a moment AFTER we have left the ladder
+		m_throttleTimer.Start( 1.0f );
+
+		return;
+	}
+
+	if ( subject == NULL )
+	{
+		if ( bot->IsDebugging( NEXTBOT_PATH ) )
+		{
+			DevMsg( "%3.2f: bot(#%d) CasePath::RefreshPath failed. No subject.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+		}
+		return;
+	}
+
+	if ( !m_failTimer.IsElapsed() )
+	{
+// 		if ( bot->IsDebugging( NEXTBOT_PATH ) )
+// 		{
+// 			DevMsg( "%3.2f: bot(#%d) ChasePath::RefreshPath failed. Fail timer not elapsed.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+// 		}
+		return;
+	}
+
+	// if our path subject changed, repath immediately
+	if ( subject != m_lastPathSubject )
+	{
+		if ( bot->IsDebugging( NEXTBOT_PATH ) )
+		{
+			DevMsg( "%3.2f: bot(#%d) Chase path subject changed (from %p to %p).\n", gpGlobals->curtime, bot->GetEntity()->entindex(), m_lastPathSubject.Get(), subject );
+		}
+
+		Invalidate();
+
+		// new subject, fresh attempt
+		m_failTimer.Invalidate();
+	}
+
+	if ( IsValid() && !m_throttleTimer.IsElapsed() )
+	{
+		// require a minimum time between repaths, as long as we have a path to follow
+// 		if ( bot->IsDebugging( NEXTBOT_PATH ) )
+// 		{
+// 			DevMsg( "%3.2f: bot(#%d) ChasePath::RefreshPath failed. Rate throttled.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+// 		}
+		return;
+	}
+
+	if ( IsValid() && m_lifetimeTimer.HasStarted() && m_lifetimeTimer.IsElapsed() )
+	{
+		// this path's lifetime has elapsed
+		Invalidate();
+	}
+	
+	if ( !IsValid() || IsRepathNeeded( bot, subject ) )
+	{
+		// the situation has changed - try a new path
+		bool isPath;
+		Vector pathTarget = subject->GetAbsOrigin();
+
+		if ( m_chaseHow == LEAD_SUBJECT )
+		{
+			pathTarget = pPredictedSubjectPos ? *pPredictedSubjectPos : PredictSubjectPosition( bot, subject );
+			isPath = Compute( bot, pathTarget, cost, GetMaxPathLength() );
+		}
+		else if ( subject->MyCombatCharacterPointer() && subject->MyCombatCharacterPointer()->GetLastKnownArea() )
+		{
+			isPath = Compute( bot, subject->MyCombatCharacterPointer(), cost, GetMaxPathLength() );
+		}
+		else
+		{
+			isPath = Compute( bot, pathTarget, cost, GetMaxPathLength() );
+		}
+
+		if ( isPath )
+		{
+			if ( bot->IsDebugging( NEXTBOT_PATH ) )
+			{
+				//const float size = 20.0f;			
+				//NDebugOverlay::VertArrow( bot->GetPosition() + Vector( 0, 0, size ), bot->GetPosition(), size, 255, RandomInt( 0, 200 ), 255, 255, true, 30.0f );
+
+				DevMsg( "%3.2f: bot(#%d) REPATH\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+			}
+
+			m_lastPathSubject = subject;
+
+			const float minRepathInterval = 0.5f;
+			m_throttleTimer.Start( minRepathInterval );
+
+			// track the lifetime of this new path
+			float lifetime = GetLifetime();
+			if ( lifetime > 0.0f )
+			{
+				m_lifetimeTimer.Start( lifetime );
+			}
+			else
+			{
+				m_lifetimeTimer.Invalidate();
+			}
+		}
+		else
+		{
+			// can't reach subject - throttle retry based on range to subject
+			m_failTimer.Start( 0.005f * ( bot->GetRangeTo( subject ) ) );
+			
+			// allow bot to react to path failure
+			bot->OnMoveToFailure( this, FAIL_NO_PATH_EXISTS );
+
+			if ( bot->IsDebugging( NEXTBOT_PATH ) )
+			{
+				//const float size = 20.0f;	
+				const float dT = 90.0f;		
+				int c = RandomInt( 0, 100 );
+				//NDebugOverlay::VertArrow( bot->GetPosition() + Vector( 0, 0, size ), bot->GetPosition(), size, 255, c, c, 255, true, dT );
+				NDebugOverlay::HorzArrow( bot->GetPosition(), pathTarget, 5.0f, 255, c, c, 255, true, dT );
+
+				DevMsg( "%3.2f: bot(#%d) REPATH FAILED\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+			}
+
+			Invalidate();
+		}
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------------------------------------------------
+//----------------------------------------------------------------------------------------------------------------------------------------------
+/**
+ * Directly beeline toward victim if we have a clear shot, otherwise pathfind.
+ */
+class DirectChasePath : public ChasePath
+{
+public:
+
+	DirectChasePath( ChasePath::SubjectChaseType chaseHow = ChasePath::DONT_LEAD_SUBJECT ) : ChasePath( chaseHow )
+	{
+
+	}
+
+	//-------------------------------------------------------------------------------------------------------
+	virtual void Update( INextBot *me, CBaseEntity *victim, const IPathCost &pathCost, Vector *pPredictedSubjectPos = NULL )	// update path to chase target and move bot along path
+	{
+		Assert( !pPredictedSubjectPos );
+		bool bComputedPredictedPosition;
+		Vector vecPredictedPosition;
+		if ( !DirectChase( &bComputedPredictedPosition, &vecPredictedPosition, me, victim ) )
+		{
+			// path around obstacles to reach our victim
+			ChasePath::Update( me, victim, pathCost, bComputedPredictedPosition ? &vecPredictedPosition : NULL );
+		}
+		NotifyVictim( me, victim );
+	}
+
+	//-------------------------------------------------------------------------------------------------------
+	bool DirectChase( bool *pPredictedPositionComputed, Vector *pPredictedPos, INextBot *me, CBaseEntity *victim )		// if there is nothing between us and our victim, run directly at them
+	{
+		*pPredictedPositionComputed = false;
+
+		ILocomotion *mover = me->GetLocomotionInterface();
+
+		if ( me->IsImmobile() || mover->IsScrambling() )
+		{
+			return false;
+		}
+
+		if ( IsDiscontinuityAhead( me, CLIMB_UP ) )
+		{
+			return false;
+		}
+
+		if ( IsDiscontinuityAhead( me, JUMP_OVER_GAP ) )
+		{
+			return false;
+		}
+
+		Vector leadVictimPos = PredictSubjectPosition( me, victim );
+
+		// Don't want to have to compute the predicted position twice.
+		*pPredictedPositionComputed = true;
+		*pPredictedPos = leadVictimPos;
+
+		if ( !mover->IsPotentiallyTraversable( mover->GetFeet(), leadVictimPos  ) )
+		{
+			return false;
+		}
+
+		// the way is clear - move directly towards our victim
+		mover->FaceTowards( leadVictimPos );
+		mover->Approach( leadVictimPos );
+
+		me->GetBodyInterface()->AimHeadTowards( victim );
+
+		// old path is no longer useful since we've moved off of it
+		Invalidate();
+
+		return true;
+	}
+
+	//-------------------------------------------------------------------------------------------------------
+	virtual bool IsRepathNeeded( INextBot *bot, CBaseEntity *subject ) const			// return true if situation has changed enough to warrant recomputing the current path
+	{
+		if ( ChasePath::IsRepathNeeded( bot, subject ) )
+		{
+			return true;
+		}
+
+		return bot->GetLocomotionInterface()->IsStuck() && bot->GetLocomotionInterface()->GetStuckDuration() > 2.0f;
+	}
+
+	//-------------------------------------------------------------------------------------------------------
+	/**
+	 * Determine exactly where the path goes between the given two areas
+	 * on the path. Return this point in 'crossPos'.
+	 */
+	virtual void ComputeAreaCrossing( INextBot *bot, const CNavArea *from, const Vector &fromPos, const CNavArea *to, NavDirType dir, Vector *crossPos ) const
+	{
+		Vector center;
+		float halfWidth;
+		from->ComputePortal( to, dir, &center, &halfWidth );
+
+		*crossPos = center;
+	}
+
+	void NotifyVictim( INextBot *me, CBaseEntity *victim );
+};
+
+
+
+
+#endif // _NEXT_BOT_CHASE_PATH_

game/server/NextBot/Path/NextBotPath.h

@@ -0,0 +1,862 @@
+// NextBotPath.h
+// Encapsulate and manipulate a path through the world
+// Author: Michael Booth, February 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_PATH_H_
+#define _NEXT_BOT_PATH_H_
+
+#include "NextBotInterface.h"
+
+#include "tier0/vprof.h"
+
+#define PATH_NO_LENGTH_LIMIT 0.0f				// non-default argument value for Path::Compute()
+#define PATH_TRUNCATE_INCOMPLETE_PATH false		// non-default argument value for Path::Compute()
+
+class INextBot;
+class CNavArea;
+class CNavLadder;
+
+
+//---------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for pathfinding costs.
+ * TODO: Replace all template cost functors with this interface, so we can virtualize and derive from them.
+ */
+class IPathCost
+{
+public:
+	virtual float operator()( CNavArea *area, CNavArea *fromArea, const CNavLadder *ladder, const CFuncElevator *elevator, float length ) const = 0;
+};
+
+
+//---------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for selecting a goal area during "open goal" pathfinding
+ */
+class IPathOpenGoalSelector
+{
+public:
+	// compare "newArea" to "currentGoal" and return the area that is the better goal area
+	virtual CNavArea *operator() ( CNavArea *currentGoal, CNavArea *newArea ) const = 0;
+};
+
+
+//---------------------------------------------------------------------------------------------------------------
+/**
+ * A Path through the world.
+ * Not only does this encapsulate a path to get from point A to point B,
+ * but also the selecting the decision algorithm for how to build that path.
+ */
+class Path
+{
+public:
+	Path( void );
+	virtual ~Path() { }
+	
+	enum SegmentType
+	{
+		ON_GROUND,
+		DROP_DOWN,
+		CLIMB_UP,
+		JUMP_OVER_GAP,
+		LADDER_UP,
+		LADDER_DOWN,
+		
+		NUM_SEGMENT_TYPES
+	};
+
+	// @todo Allow custom Segment classes for different kinds of paths	
+	struct Segment
+	{
+		CNavArea *area;									// the area along the path
+		NavTraverseType how;							// how to enter this area from the previous one
+		Vector pos;										// our movement goal position at this point in the path
+		const CNavLadder *ladder;						// if "how" refers to a ladder, this is it
+		
+		SegmentType type;								// how to traverse this segment of the path
+		Vector forward;									// unit vector along segment
+		float length;									// length of this segment
+		float distanceFromStart;						// distance of this node from the start of the path
+		float curvature;								// how much the path 'curves' at this point in the XY plane (0 = none, 1 = 180 degree doubleback)
+
+		Vector m_portalCenter;							// position of center of 'portal' between previous area and this area
+		float m_portalHalfWidth;						// half width of 'portal'
+	};
+
+	virtual float GetLength( void ) const;						// return length of path from start to finish
+	virtual const Vector &GetPosition( float distanceFromStart, const Segment *start = NULL ) const;	// return a position on the path at the given distance from the path start
+	virtual const Vector &GetClosestPosition( const Vector &pos, const Segment *start = NULL, float alongLimit = 0.0f ) const;		// return the closest point on the path to the given position
+
+	virtual const Vector &GetStartPosition( void ) const;	// return the position where this path starts
+	virtual const Vector &GetEndPosition( void ) const;		// return the position where this path ends
+	virtual CBaseCombatCharacter *GetSubject( void ) const;	// return the actor this path leads to, or NULL if there is no subject
+
+	virtual const Path::Segment *GetCurrentGoal( void ) const;	// return current goal along the path we are trying to reach
+
+	virtual float GetAge( void ) const;					// return "age" of this path (time since it was built)
+
+	enum SeekType
+	{
+		SEEK_ENTIRE_PATH,			// search the entire path length
+		SEEK_AHEAD,					// search from current cursor position forward toward end of path
+		SEEK_BEHIND					// search from current cursor position backward toward path start
+	};
+	virtual void MoveCursorToClosestPosition( const Vector &pos, SeekType type = SEEK_ENTIRE_PATH, float alongLimit = 0.0f ) const;		// Set cursor position to closest point on path to given position
+	
+	enum MoveCursorType
+	{
+		PATH_ABSOLUTE_DISTANCE,
+		PATH_RELATIVE_DISTANCE
+	};
+	virtual void MoveCursorToStart( void );				// set seek cursor to start of path
+	virtual void MoveCursorToEnd( void );				// set seek cursor to end of path
+	virtual void MoveCursor( float value, MoveCursorType type = PATH_ABSOLUTE_DISTANCE );	// change seek cursor position
+	virtual float GetCursorPosition( void ) const;		// return position of seek cursor (distance along path)
+
+	struct Data
+	{
+		Vector pos;										// the position along the path
+		Vector forward;									// unit vector along path direction
+		float curvature;								// how much the path 'curves' at this point in the XY plane (0 = none, 1 = 180 degree doubleback)
+		const Segment *segmentPrior;					// the segment just before this position
+	};
+	virtual const Data &GetCursorData( void ) const;	// return path state at the current cursor position
+
+	virtual bool IsValid( void ) const;
+	virtual void Invalidate( void );					// make path invalid (clear it)
+
+	virtual void Draw( const Path::Segment *start = NULL ) const;	// draw the path for debugging
+	virtual void DrawInterpolated( float from, float to );	// draw the path for debugging - MODIFIES cursor position
+
+	virtual const Segment *FirstSegment( void ) const;	// return first segment of path
+	virtual const Segment *NextSegment( const Segment *currentSegment ) const;	// return next segment of path, given current one
+	virtual const Segment *PriorSegment( const Segment *currentSegment ) const;	// return previous segment of path, given current one
+	virtual const Segment *LastSegment( void ) const;	// return last segment of path
+
+	enum ResultType
+	{
+		COMPLETE_PATH,
+		PARTIAL_PATH,
+		NO_PATH
+	};
+	virtual void OnPathChanged( INextBot *bot, ResultType result ) { }		// invoked when the path is (re)computed (path is valid at the time of this call)
+
+	virtual void Copy( INextBot *bot, const Path &path );	// Replace this path with the given path's data
+
+
+	//-----------------------------------------------------------------------------------------------------------------
+	/**
+	 * Compute shortest path from bot to given actor via A* algorithm.
+	 * If returns true, path was found to the subject.
+	 * If returns false, path may either be invalid (use IsValid() to check), or valid but 
+	 * doesn't reach all the way to the subject.
+	 */
+	template< typename CostFunctor >
+	bool Compute( INextBot *bot, CBaseCombatCharacter *subject, CostFunctor &costFunc, float maxPathLength = 0.0f, bool includeGoalIfPathFails = true )
+	{
+		VPROF_BUDGET( "Path::Compute(subject)", "NextBot" );
+
+		Invalidate();
+
+		m_subject = subject;
+		
+		const Vector &start = bot->GetPosition();
+		
+		CNavArea *startArea = bot->GetEntity()->GetLastKnownArea();
+		if ( !startArea )
+		{
+			OnPathChanged( bot, NO_PATH );
+			return false;
+		}
+
+		CNavArea *subjectArea = subject->GetLastKnownArea();
+		if ( !subjectArea )
+		{
+			OnPathChanged( bot, NO_PATH );
+			return false;
+		}
+
+		Vector subjectPos = subject->GetAbsOrigin();
+		
+		// if we are already in the subject area, build trivial path
+		if ( startArea == subjectArea )
+		{
+			BuildTrivialPath( bot, subjectPos );
+			return true;
+		}
+
+		//
+		// Compute shortest path to subject
+		//
+		CNavArea *closestArea = NULL;
+		bool pathResult = NavAreaBuildPath( startArea, subjectArea, &subjectPos, costFunc, &closestArea, maxPathLength, bot->GetEntity()->GetTeamNumber() );
+
+		// Failed?
+		if ( closestArea == NULL )
+			return false;
+
+		//
+		// Build actual path by following parent links back from goal area
+		//
+
+		// get count
+		int count = 0;
+		CNavArea *area;
+		for( area = closestArea; area; area = area->GetParent() )
+		{
+			++count;
+
+			if ( area == startArea )
+			{
+				// startArea can be re-evaluated during the pathfind and given a parent...
+				break;
+			}
+			if ( count >= MAX_PATH_SEGMENTS-1 ) // save room for endpoint
+				break;
+		}
+		
+		if ( count == 1 )
+		{
+			BuildTrivialPath( bot, subjectPos );
+			return pathResult;
+		}
+
+		// assemble path
+		m_segmentCount = count;
+		for( area = closestArea; count && area; area = area->GetParent() )
+		{
+			--count;
+			m_path[ count ].area = area;
+			m_path[ count ].how = area->GetParentHow();
+			m_path[ count ].type = ON_GROUND;
+		}
+
+		if ( pathResult || includeGoalIfPathFails )
+		{
+			// append actual subject position
+			m_path[ m_segmentCount ].area = closestArea;
+			m_path[ m_segmentCount ].pos = subjectPos;
+			m_path[ m_segmentCount ].ladder = NULL;
+			m_path[ m_segmentCount ].how = NUM_TRAVERSE_TYPES;
+			m_path[ m_segmentCount ].type = ON_GROUND;
+			++m_segmentCount;
+		}
+				
+		// compute path positions
+		if ( ComputePathDetails( bot, start ) == false )
+		{
+			Invalidate();
+			OnPathChanged( bot, NO_PATH );
+			return false;
+		}
+
+		// remove redundant nodes and clean up path
+		Optimize( bot );
+		
+		PostProcess();
+
+		OnPathChanged( bot, pathResult ? COMPLETE_PATH : PARTIAL_PATH );
+
+		return pathResult;
+	}
+
+
+	//-----------------------------------------------------------------------------------------------------------------
+	/**
+	 * Compute shortest path from bot to 'goal' via A* algorithm.
+	 * If returns true, path was found to the goal position.
+	 * If returns false, path may either be invalid (use IsValid() to check), or valid but 
+	 * doesn't reach all the way to the goal.
+	 */
+	template< typename CostFunctor >
+	bool Compute( INextBot *bot, const Vector &goal, CostFunctor &costFunc, float maxPathLength = 0.0f, bool includeGoalIfPathFails = true )
+	{
+		VPROF_BUDGET( "Path::Compute(goal)", "NextBotSpiky" );
+
+		Invalidate();
+		
+		const Vector &start = bot->GetPosition();
+		
+		CNavArea *startArea = bot->GetEntity()->GetLastKnownArea();
+		if ( !startArea )
+		{
+			OnPathChanged( bot, NO_PATH );
+			return false;
+		}
+
+		// check line-of-sight to the goal position when finding it's nav area
+		const float maxDistanceToArea = 200.0f;
+		CNavArea *goalArea = TheNavMesh->GetNearestNavArea( goal, true, maxDistanceToArea, true );
+
+		// if we are already in the goal area, build trivial path
+		if ( startArea == goalArea )
+		{
+			BuildTrivialPath( bot, goal );
+			return true;
+		}
+
+		// make sure path end position is on the ground
+		Vector pathEndPosition = goal;
+		if ( goalArea )
+		{
+			pathEndPosition.z = goalArea->GetZ( pathEndPosition );
+		}
+		else
+		{
+			TheNavMesh->GetGroundHeight( pathEndPosition, &pathEndPosition.z );
+		}
+
+		//
+		// Compute shortest path to goal
+		//
+		CNavArea *closestArea = NULL;
+		bool pathResult = NavAreaBuildPath( startArea, goalArea, &goal, costFunc, &closestArea, maxPathLength, bot->GetEntity()->GetTeamNumber() );
+
+		// Failed?
+		if ( closestArea == NULL )
+			return false;
+
+		//
+		// Build actual path by following parent links back from goal area
+		//
+
+		// get count
+		int count = 0;
+		CNavArea *area;
+		for( area = closestArea; area; area = area->GetParent() )
+		{
+			++count;
+
+			if ( area == startArea )
+			{
+				// startArea can be re-evaluated during the pathfind and given a parent...
+				break;
+			}
+			if ( count >= MAX_PATH_SEGMENTS-1 ) // save room for endpoint
+				break;
+		}
+		
+		if ( count == 1 )
+		{
+			BuildTrivialPath( bot, goal );
+			return pathResult;
+		}
+
+		// assemble path
+		m_segmentCount = count;
+		for( area = closestArea; count && area; area = area->GetParent() )
+		{
+			--count;
+			m_path[ count ].area = area;
+			m_path[ count ].how = area->GetParentHow();
+			m_path[ count ].type = ON_GROUND;
+		}
+
+		if ( pathResult || includeGoalIfPathFails )
+		{
+			// append actual goal position
+			m_path[ m_segmentCount ].area = closestArea;
+			m_path[ m_segmentCount ].pos = pathEndPosition;
+			m_path[ m_segmentCount ].ladder = NULL;
+			m_path[ m_segmentCount ].how = NUM_TRAVERSE_TYPES;
+			m_path[ m_segmentCount ].type = ON_GROUND;
+			++m_segmentCount;
+		}
+				
+		// compute path positions
+		if ( ComputePathDetails( bot, start ) == false )
+		{
+			Invalidate();
+			OnPathChanged( bot, NO_PATH );
+			return false;
+		}
+
+		// remove redundant nodes and clean up path
+		Optimize( bot );
+		
+		PostProcess();
+
+		OnPathChanged( bot, pathResult ? COMPLETE_PATH : PARTIAL_PATH );
+
+		return pathResult;
+	}
+
+
+	//-----------------------------------------------------------------------------------------------------------------
+	/**
+	 * Build a path from bot's current location to an undetermined goal area
+	 * that minimizes the given cost along the final path and meets the
+	 * goal criteria.
+	 */
+	virtual bool ComputeWithOpenGoal( INextBot *bot, const IPathCost &costFunc, const IPathOpenGoalSelector &goalSelector, float maxSearchRadius = 0.0f )
+	{
+		VPROF_BUDGET( "ComputeWithOpenGoal", "NextBot" );
+
+		int teamID = bot->GetEntity()->GetTeamNumber();
+
+		CNavArea *startArea = bot->GetEntity()->GetLastKnownArea();
+
+		if ( startArea == NULL )
+			return NULL;
+
+		startArea->SetParent( NULL );
+
+		// start search
+		CNavArea::ClearSearchLists();
+
+		float initCost = costFunc( startArea, NULL, NULL, NULL, -1.0f );
+		if ( initCost < 0.0f )
+			return NULL;
+
+		startArea->SetTotalCost( initCost );
+		startArea->AddToOpenList();
+
+		// find our goal as we search
+		CNavArea *goalArea = NULL;
+
+		//
+		// Dijkstra's algorithm (since we don't know our goal).
+		//
+		while( !CNavArea::IsOpenListEmpty() )
+		{
+			// get next area to check
+			CNavArea *area = CNavArea::PopOpenList();
+
+			area->AddToClosedList();
+
+			// don't consider blocked areas
+			if ( area->IsBlocked( teamID ) )
+				continue;
+
+			// build adjacent area array
+			CollectAdjacentAreas( area );
+
+			// search adjacent areas
+			for( int i=0; i<m_adjAreaIndex; ++i )
+			{
+				CNavArea *newArea = m_adjAreaVector[ i ].area;
+
+				// only visit each area once
+				if ( newArea->IsClosed() )
+					continue;
+
+				// don't consider blocked areas
+				if ( newArea->IsBlocked( teamID ) )
+					continue;
+
+				// don't use this area if it is out of range
+				if ( maxSearchRadius > 0.0f && ( newArea->GetCenter() - bot->GetEntity()->GetAbsOrigin() ).IsLengthGreaterThan( maxSearchRadius ) )
+					continue;
+
+				// determine cost of traversing this area
+				float newCost = costFunc( newArea, area, m_adjAreaVector[ i ].ladder, NULL, -1.0f );
+
+				// don't use adjacent area if cost functor says it is a dead-end
+				if ( newCost < 0.0f )
+					continue;
+
+				if ( newArea->IsOpen() && newArea->GetTotalCost() <= newCost )
+				{
+					// we have already visited this area, and it has a better path
+					continue;
+				}
+				else
+				{
+					// whether this area has been visited or not, we now have a better path to it
+					newArea->SetParent( area, m_adjAreaVector[ i ].how );
+					newArea->SetTotalCost( newCost );
+
+					// use 'cost so far' to hold cumulative cost
+					newArea->SetCostSoFar( newCost );
+
+					// tricky bit here - relying on OpenList being sorted by cost
+					if ( newArea->IsOpen() )
+					{
+						// area already on open list, update the list order to keep costs sorted
+						newArea->UpdateOnOpenList();
+					}
+					else
+					{
+						newArea->AddToOpenList();
+					}
+
+					// keep track of best goal so far
+					goalArea = goalSelector( goalArea, newArea );
+				}
+			}
+		}
+
+		if ( goalArea )
+		{
+			// compile the path details into a usable path
+			AssemblePrecomputedPath( bot, goalArea->GetCenter(), goalArea );
+			return true;
+		}	
+
+		// all adjacent areas are likely too far away
+		return false;
+	}
+
+
+	//-----------------------------------------------------------------------------------------------------------------
+	/**
+	 * Given the last area in a path with valid parent pointers, 
+	 * construct the actual path.
+	 */
+	void AssemblePrecomputedPath( INextBot *bot, const Vector &goal, CNavArea *endArea )
+	{
+		VPROF_BUDGET( "AssemblePrecomputedPath", "NextBot" );
+
+		const Vector &start = bot->GetPosition();
+
+		// get count
+		int count = 0;
+		CNavArea *area;
+		for( area = endArea; area; area = area->GetParent() )
+		{
+			++count;
+		}
+
+		// save room for endpoint
+		if ( count > MAX_PATH_SEGMENTS-1 )
+		{
+			count = MAX_PATH_SEGMENTS-1;
+		}
+		else if ( count == 0 )
+		{
+			return;
+		}
+
+		if ( count == 1 )
+		{
+			BuildTrivialPath( bot, goal );
+			return;
+		}
+
+		// assemble path
+		m_segmentCount = count;
+		for( area = endArea; count && area; area = area->GetParent() )
+		{
+			--count;
+			m_path[ count ].area = area;
+			m_path[ count ].how = area->GetParentHow();
+			m_path[ count ].type = ON_GROUND;
+		}
+
+		// append actual goal position
+		m_path[ m_segmentCount ].area = endArea;
+		m_path[ m_segmentCount ].pos = goal;
+		m_path[ m_segmentCount ].ladder = NULL;
+		m_path[ m_segmentCount ].how = NUM_TRAVERSE_TYPES;
+		m_path[ m_segmentCount ].type = ON_GROUND;
+		++m_segmentCount;
+
+		// compute path positions
+		if ( ComputePathDetails( bot, start ) == false )
+		{
+			Invalidate();
+			OnPathChanged( bot, NO_PATH );
+			return;
+		}
+
+		// remove redundant nodes and clean up path
+		Optimize( bot );
+
+		PostProcess();
+
+		OnPathChanged( bot, COMPLETE_PATH );
+	}
+
+	/**
+	 * Utility function for when start and goal are in the same area
+	 */
+	bool BuildTrivialPath( INextBot *bot, const Vector &goal );	
+
+	/**
+	 * Determine exactly where the path goes between the given two areas
+	 * on the path. Return this point in 'crossPos'.
+	 */
+	virtual void ComputeAreaCrossing( INextBot *bot, const CNavArea *from, const Vector &fromPos, const CNavArea *to, NavDirType dir, Vector *crossPos ) const;
+
+
+private:
+	enum { MAX_PATH_SEGMENTS = 256 };
+	Segment m_path[ MAX_PATH_SEGMENTS ];
+	int m_segmentCount;
+
+	bool ComputePathDetails( INextBot *bot, const Vector &start );		// determine actual path positions 
+
+	void Optimize( INextBot *bot );
+	void PostProcess( void );
+	int FindNextOccludedNode( INextBot *bot, int anchor );	// used by Optimize()
+
+	void InsertSegment( Segment newSegment, int i );		// insert new segment at index i
+	
+	mutable Vector m_pathPos;								// used by GetPosition()
+	mutable Vector m_closePos;								// used by GetClosestPosition()
+
+	mutable float m_cursorPos;					// current cursor position (distance along path)
+	mutable Data m_cursorData;					// used by GetCursorData()
+	mutable bool m_isCursorDataDirty;
+
+	IntervalTimer m_ageTimer;					// how old is this path?
+	CHandle< CBaseCombatCharacter > m_subject;	// the subject this path leads to
+
+	/**
+	 * Build a vector of adjacent areas reachable from the given area
+	 */
+	void CollectAdjacentAreas( CNavArea *area )
+	{
+		m_adjAreaIndex = 0;			
+
+		const NavConnectVector &adjNorth = *area->GetAdjacentAreas( NORTH );		
+		FOR_EACH_VEC( adjNorth, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjNorth[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_NORTH;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavConnectVector &adjSouth = *area->GetAdjacentAreas( SOUTH );		
+		FOR_EACH_VEC( adjSouth, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjSouth[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_SOUTH;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavConnectVector &adjWest = *area->GetAdjacentAreas( WEST );		
+		FOR_EACH_VEC( adjWest, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjWest[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_WEST;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavConnectVector &adjEast = *area->GetAdjacentAreas( EAST );	
+		FOR_EACH_VEC( adjEast, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjEast[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_EAST;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavLadderConnectVector &adjUpLadder = *area->GetLadders( CNavLadder::LADDER_UP );
+		FOR_EACH_VEC( adjUpLadder, it )
+		{
+			CNavLadder *ladder = adjUpLadder[ it ].ladder;
+
+			if ( ladder->m_topForwardArea && m_adjAreaIndex < MAX_ADJ_AREAS )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_topForwardArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_UP;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+
+			if ( ladder->m_topLeftArea && m_adjAreaIndex < MAX_ADJ_AREAS )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_topLeftArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_UP;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+
+			if ( ladder->m_topRightArea && m_adjAreaIndex < MAX_ADJ_AREAS )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_topRightArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_UP;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+		}
+
+		const NavLadderConnectVector &adjDownLadder = *area->GetLadders( CNavLadder::LADDER_DOWN );
+		FOR_EACH_VEC( adjDownLadder, it )
+		{
+			CNavLadder *ladder = adjDownLadder[ it ].ladder;
+
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			if ( ladder->m_bottomArea )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_bottomArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_DOWN;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+		}
+	}
+
+	enum { MAX_ADJ_AREAS = 64 };
+
+	struct AdjInfo
+	{
+		CNavArea *area;
+		CNavLadder *ladder;
+		NavTraverseType how;		
+	};
+
+	AdjInfo m_adjAreaVector[ MAX_ADJ_AREAS ];
+	int m_adjAreaIndex;
+
+};
+
+
+inline float Path::GetLength( void ) const
+{
+	if (m_segmentCount <= 0)
+	{
+		return 0.0f;
+	}
+	
+	return m_path[ m_segmentCount-1 ].distanceFromStart;
+}
+
+inline bool Path::IsValid( void ) const
+{
+	return (m_segmentCount > 0);
+}
+
+inline void Path::Invalidate( void )
+{
+	m_segmentCount = 0;
+
+	m_cursorPos = 0.0f;
+	
+	m_cursorData.pos = vec3_origin;
+	m_cursorData.forward = Vector( 1.0f, 0, 0 );
+	m_cursorData.curvature = 0.0f;
+	m_cursorData.segmentPrior = NULL;
+	
+	m_isCursorDataDirty = true;
+
+	m_subject = NULL;
+}
+
+inline const Path::Segment *Path::FirstSegment( void ) const
+{
+	return (IsValid()) ? &m_path[0] : NULL;
+}
+
+inline const Path::Segment *Path::NextSegment( const Segment *currentSegment ) const
+{
+	if (currentSegment == NULL || !IsValid())
+		return NULL;
+		
+	int i = currentSegment - m_path;
+
+	if (i < 0 || i >= m_segmentCount-1)
+	{
+		return NULL;
+	}
+	
+	return &m_path[ i+1 ];
+}
+
+inline const Path::Segment *Path::PriorSegment( const Segment *currentSegment ) const
+{
+	if (currentSegment == NULL || !IsValid())
+		return NULL;
+		
+	int i = currentSegment - m_path;
+
+	if (i < 1 || i >= m_segmentCount)
+	{
+		return NULL;
+	}
+	
+	return &m_path[ i-1 ];
+}
+
+inline const Path::Segment *Path::LastSegment( void ) const
+{
+	return ( IsValid() ) ? &m_path[ m_segmentCount-1 ] : NULL;
+}
+
+inline const Vector &Path::GetStartPosition( void ) const
+{
+	return ( IsValid() ) ? m_path[ 0 ].pos : vec3_origin;
+}
+
+inline const Vector &Path::GetEndPosition( void ) const
+{
+	return ( IsValid() ) ? m_path[ m_segmentCount-1 ].pos : vec3_origin;
+}
+
+inline CBaseCombatCharacter *Path::GetSubject( void ) const
+{
+	return m_subject;
+}
+
+inline void Path::MoveCursorToStart( void )
+{
+	m_cursorPos = 0.0f;
+	m_isCursorDataDirty = true;
+}
+
+inline void Path::MoveCursorToEnd( void )
+{
+	m_cursorPos = GetLength();
+	m_isCursorDataDirty = true;
+}
+
+inline void Path::MoveCursor( float value, MoveCursorType type )
+{
+	if ( type == PATH_ABSOLUTE_DISTANCE )
+	{
+		m_cursorPos = value;
+	}
+	else	// relative distance
+	{
+		m_cursorPos += value;
+	}
+	
+	if ( m_cursorPos < 0.0f )
+	{
+		m_cursorPos = 0.0f;
+	}
+	else if ( m_cursorPos > GetLength() )
+	{
+		m_cursorPos = GetLength();
+	}
+	
+	m_isCursorDataDirty = true;
+}
+
+inline float Path::GetCursorPosition( void ) const
+{
+	return m_cursorPos;
+}
+
+inline const Path::Segment *Path::GetCurrentGoal( void ) const
+{
+	return NULL;
+}
+
+inline float Path::GetAge( void ) const
+{
+	return m_ageTimer.GetElapsedTime();
+}
+
+
+#endif	// _NEXT_BOT_PATH_H_
+

game/server/NextBot/Path/NextBotPathFollow.h

@@ -0,0 +1,106 @@
+// NextBotPathFollow.h
+// Path following
+// Author: Michael Booth, April 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_PATH_FOLLOWER_
+#define _NEXT_BOT_PATH_FOLLOWER_
+
+#include "nav_mesh.h"
+#include "nav_pathfind.h"
+#include "NextBotPath.h"
+
+class INextBot;
+class ILocomotion;
+
+
+//--------------------------------------------------------------------------------------------------------
+/**
+ * A PathFollower extends a Path to include mechanisms to move along (follow) it
+ */
+class PathFollower : public Path
+{
+public:
+	PathFollower( void );
+	virtual ~PathFollower();
+
+	virtual void Invalidate( void );				// (EXTEND) cause the path to become invalid
+	virtual void Draw( const Path::Segment *start = NULL ) const;	// (EXTEND) draw the path for debugging
+	virtual void OnPathChanged( INextBot *bot, Path::ResultType result );	// invoked when the path is (re)computed (path is valid at the time of this call)
+
+	virtual void Update( INextBot *bot );			// move bot along path
+
+	virtual const Path::Segment *GetCurrentGoal( void ) const;	// return current goal along the path we are trying to reach
+
+	virtual void SetMinLookAheadDistance( float value );		// minimum range movement goal must be along path
+	
+	virtual CBaseEntity *GetHindrance( void ) const;			// returns entity that is hindering our progress along the path
+
+	virtual bool IsDiscontinuityAhead( INextBot *bot, Path::SegmentType type, float range = -1.0f ) const;	// return true if there is a the given discontinuity ahead in the path within the given range (-1 = entire remaining path)
+
+	void SetGoalTolerance( float range );			// set tolerance within at which we're considered to be at our goal
+
+private:
+	const Path::Segment *m_goal;					// our current goal along the path
+	float m_minLookAheadRange;
+
+	bool CheckProgress( INextBot *bot );
+	bool IsAtGoal( INextBot *bot ) const;			// return true if reached current path goal
+
+	//bool IsOnStairs( INextBot *bot ) const;		// return true if bot is standing on a stairway
+	bool m_isOnStairs;
+
+	CountdownTimer m_avoidTimer;					// do avoid check more often if we recently avoided
+
+	CountdownTimer m_waitTimer;						// for waiting for a blocker to move off our path
+	CHandle< CBaseEntity > m_hindrance;
+	
+	// debug display data for avoid volumes
+	bool m_didAvoidCheck;
+	Vector m_leftFrom;
+	Vector m_leftTo;
+	bool m_isLeftClear;
+	Vector m_rightFrom;
+	Vector m_rightTo;
+	bool m_isRightClear;
+	Vector m_hullMin, m_hullMax;
+
+	void AdjustSpeed( INextBot *bot );				// adjust speed based on path curvature
+
+	Vector Avoid( INextBot *bot, const Vector &goalPos, const Vector &forward, const Vector &left );		// avoidance movements for very nearby obstacles. returns modified goal position
+	bool Climbing( INextBot *bot, const Path::Segment *goal, const Vector &forward, const Vector &left, float goalRange );		// climb up ledges 
+	bool JumpOverGaps( INextBot *bot, const Path::Segment *goal, const Vector &forward, const Vector &left, float goalRange );	// jump over gaps
+
+	bool LadderUpdate( INextBot *bot );				// move bot along ladder
+	CBaseEntity *FindBlocker( INextBot *bot );		// if entity is returned, it is blocking us from continuing along our path
+
+	float m_goalTolerance;
+};
+
+
+inline void PathFollower::SetGoalTolerance( float range )
+{
+	m_goalTolerance = range;
+}
+
+
+inline const Path::Segment *PathFollower::GetCurrentGoal( void ) const
+{
+	return m_goal;
+}
+
+
+inline void PathFollower::SetMinLookAheadDistance( float value )
+{
+	m_minLookAheadRange = value;
+}
+
+inline CBaseEntity *PathFollower::GetHindrance( void ) const
+{
+	return m_hindrance;
+}
+
+
+#endif // _NEXT_BOT_PATH_FOLLOWER_
+
+

game/server/NextBot/Path/NextBotRetreatPath.h

@@ -0,0 +1,573 @@
+// NextBotRetreatPath.h
+// Maintain and follow a path that leads safely away from the given Actor
+// Author: Michael Booth, February 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_RETREAT_PATH_
+#define _NEXT_BOT_RETREAT_PATH_
+
+#include "nav.h"
+#include "NextBotInterface.h"
+#include "NextBotLocomotionInterface.h"
+#include "NextBotRetreatPath.h"
+#include "NextBotUtil.h"
+#include "NextBotPathFollow.h"
+#include "tier0/vprof.h"
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * A RetreatPath extends a PathFollower to periodically recompute a path 
+ * away from a threat, and to move along the path away from that threat.
+ */
+class RetreatPath : public PathFollower
+{
+public:
+	RetreatPath( void );
+	virtual ~RetreatPath() { }
+
+	void Update( INextBot *bot, CBaseEntity *threat );	// update path away from threat and move bot along path
+
+	virtual float GetMaxPathLength( void ) const;		// return maximum path length
+
+	virtual void Invalidate( void );					// (EXTEND) cause the path to become invalid
+
+private:
+	void RefreshPath( INextBot *bot, CBaseEntity *threat );
+
+	CountdownTimer m_throttleTimer;						// require a minimum time between re-paths
+	EHANDLE m_pathThreat;								// the threat of our existing path
+	Vector m_pathThreatPos;								// where the threat was when the path was built
+};
+
+inline RetreatPath::RetreatPath( void )
+{
+	m_throttleTimer.Invalidate();
+	m_pathThreat = NULL;
+}
+
+inline float RetreatPath::GetMaxPathLength( void ) const
+{
+	return 1000.0f;
+}
+
+inline void RetreatPath::Invalidate( void )
+{
+	// path is gone, repath at earliest opportunity
+	m_throttleTimer.Invalidate();
+	m_pathThreat = NULL;
+
+	// extend
+	PathFollower::Invalidate();	
+}
+
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Maintain a path to our chase threat and move along that path
+ */
+inline void RetreatPath::Update( INextBot *bot, CBaseEntity *threat )
+{
+	VPROF_BUDGET( "RetreatPath::Update", "NextBot" );
+
+	if ( threat == NULL )
+	{
+		return;
+	}
+
+	// if our path threat changed, repath immediately
+	if ( threat != m_pathThreat )
+	{
+		if ( bot->IsDebugging( INextBot::PATH ) )
+		{
+			DevMsg( "%3.2f: bot(#%d) Chase path threat changed (from %X to %X).\n", gpGlobals->curtime, bot->GetEntity()->entindex(), m_pathThreat.Get(), threat );
+		}
+
+		Invalidate();
+	}
+
+	// maintain the path away from the threat
+	RefreshPath( bot, threat );
+
+	// move along the path towards the threat
+	PathFollower::Update( bot );
+}
+
+
+//--------------------------------------------------------------------------------------------------------------
+/**
+ * Build a path away from retreatFromArea up to retreatRange in length.
+ */
+class RetreatPathBuilder
+{
+public:
+	RetreatPathBuilder( INextBot *me, CBaseEntity *threat, float retreatRange = 500.0f )
+	{
+		m_me = me;
+		m_mover = me->GetLocomotionInterface();
+		
+		m_threat = threat;
+		m_retreatRange = retreatRange;
+	}
+
+	CNavArea *ComputePath( void )
+	{
+		VPROF_BUDGET( "NavAreaBuildRetreatPath", "NextBot" );
+		
+		if ( m_mover == NULL )
+			return NULL;
+		
+		CNavArea *startArea = m_me->GetEntity()->GetLastKnownArea();
+
+		if ( startArea == NULL )
+			return NULL;
+
+		CNavArea *retreatFromArea = TheNavMesh->GetNearestNavArea( m_threat->GetAbsOrigin() );
+		if ( retreatFromArea == NULL )
+			return NULL;
+
+		startArea->SetParent( NULL );
+
+		// start search
+		CNavArea::ClearSearchLists();
+
+		float initCost = Cost( startArea, NULL, NULL );
+		if ( initCost < 0.0f )
+			return NULL;
+
+		int teamID = m_me->GetEntity()->GetTeamNumber();
+
+		startArea->SetTotalCost( initCost );
+
+		startArea->AddToOpenList();
+		
+		// keep track of the area farthest away from the threat
+		CNavArea *farthestArea = NULL;
+		float farthestRange = 0.0f;
+
+		//
+		// Dijkstra's algorithm (since we don't know our goal).
+		// Build a path as far away from the retreat area as possible.
+		// Minimize total path length and danger.
+		// Maximize distance to threat of end of path.
+		//
+		while( !CNavArea::IsOpenListEmpty() )
+		{
+			// get next area to check
+			CNavArea *area = CNavArea::PopOpenList();
+
+			area->AddToClosedList();
+
+			// don't consider blocked areas
+			if ( area->IsBlocked( teamID ) )
+				continue;
+
+			// build adjacent area array
+			CollectAdjacentAreas( area );
+			
+			// search adjacent areas
+			for( int i=0; i<m_adjAreaIndex; ++i )
+			{
+				CNavArea *newArea = m_adjAreaVector[ i ].area;
+				
+				// only visit each area once
+				if ( newArea->IsClosed() )
+					continue;
+				
+				// don't consider blocked areas
+				if ( newArea->IsBlocked( teamID ) )
+					continue;
+
+				// don't use this area if it is out of range
+				if ( ( newArea->GetCenter() - m_me->GetEntity()->GetAbsOrigin() ).IsLengthGreaterThan( m_retreatRange ) )
+					continue;
+				
+				// determine cost of traversing this area
+				float newCost = Cost( newArea, area, m_adjAreaVector[ i ].ladder );
+				
+				// don't use adjacent area if cost functor says it is a dead-end
+				if ( newCost < 0.0f )
+					continue;
+					
+				if ( newArea->IsOpen() && newArea->GetTotalCost() <= newCost )
+				{
+					// we have already visited this area, and it has a better path
+					continue;
+				}
+				else
+				{
+					// whether this area has been visited or not, we now have a better path
+					newArea->SetParent( area, m_adjAreaVector[ i ].how );
+					newArea->SetTotalCost( newCost );
+
+					// use 'cost so far' to hold cumulative cost
+					newArea->SetCostSoFar( newCost );
+
+					// tricky bit here - relying on OpenList being sorted by cost
+					if ( newArea->IsOpen() )
+					{
+						// area already on open list, update the list order to keep costs sorted
+						newArea->UpdateOnOpenList();
+					}
+					else
+					{
+						newArea->AddToOpenList();
+					}
+
+					// keep track of area farthest from threat
+					float threatRange = ( newArea->GetCenter() - m_threat->GetAbsOrigin() ).Length();
+					if ( threatRange > farthestRange )
+					{
+						farthestArea = newArea;
+						farthestRange = threatRange;
+					}
+				}
+			}
+		}
+
+		return farthestArea;
+	}
+
+
+	/**
+	 * Build a vector of adjacent areas reachable from the given area
+	 */
+	void CollectAdjacentAreas( CNavArea *area )
+	{
+		m_adjAreaIndex = 0;			
+
+		const NavConnectVector &adjNorth = *area->GetAdjacentAreas( NORTH );		
+		FOR_EACH_VEC( adjNorth, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjNorth[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_NORTH;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavConnectVector &adjSouth = *area->GetAdjacentAreas( SOUTH );		
+		FOR_EACH_VEC( adjSouth, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjSouth[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_SOUTH;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavConnectVector &adjWest = *area->GetAdjacentAreas( WEST );		
+		FOR_EACH_VEC( adjWest, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjWest[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_WEST;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavConnectVector &adjEast = *area->GetAdjacentAreas( EAST );	
+		FOR_EACH_VEC( adjEast, it )
+		{
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			m_adjAreaVector[ m_adjAreaIndex ].area = adjEast[ it ].area;
+			m_adjAreaVector[ m_adjAreaIndex ].how = GO_EAST;
+			m_adjAreaVector[ m_adjAreaIndex ].ladder = NULL;
+			++m_adjAreaIndex;
+		}
+
+		const NavLadderConnectVector &adjUpLadder = *area->GetLadders( CNavLadder::LADDER_UP );
+		FOR_EACH_VEC( adjUpLadder, it )
+		{
+			CNavLadder *ladder = adjUpLadder[ it ].ladder;
+
+			if ( ladder->m_topForwardArea && m_adjAreaIndex < MAX_ADJ_AREAS )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_topForwardArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_UP;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+
+			if ( ladder->m_topLeftArea && m_adjAreaIndex < MAX_ADJ_AREAS )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_topLeftArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_UP;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+
+			if ( ladder->m_topRightArea && m_adjAreaIndex < MAX_ADJ_AREAS )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_topRightArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_UP;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+		}
+
+		const NavLadderConnectVector &adjDownLadder = *area->GetLadders( CNavLadder::LADDER_DOWN );
+		FOR_EACH_VEC( adjDownLadder, it )
+		{
+			CNavLadder *ladder = adjDownLadder[ it ].ladder;
+
+			if ( m_adjAreaIndex >= MAX_ADJ_AREAS )
+				break;
+
+			if ( ladder->m_bottomArea )
+			{
+				m_adjAreaVector[ m_adjAreaIndex ].area = ladder->m_bottomArea;
+				m_adjAreaVector[ m_adjAreaIndex ].how = GO_LADDER_DOWN;
+				m_adjAreaVector[ m_adjAreaIndex ].ladder = ladder;
+				++m_adjAreaIndex;
+			}
+		}
+	}
+	
+	/**
+	 * Cost minimizes path length traveled thus far and "danger" (proximity to threat(s))
+	 */
+	float Cost( CNavArea *area, CNavArea *fromArea, const CNavLadder *ladder )
+	{
+		// check if we can use this area
+		if ( !m_mover->IsAreaTraversable( area ) )
+		{
+			return -1.0f;
+		}
+
+		int teamID = m_me->GetEntity()->GetTeamNumber();
+		if ( area->IsBlocked( teamID ) )
+		{
+			return -1.0f;
+		}
+		
+		const float debugDeltaT = 3.0f;
+
+		float cost;
+
+		const float maxThreatRange = 500.0f;
+		const float dangerDensity = 1000.0f;
+
+		if ( fromArea == NULL )
+		{
+			cost = 0.0f;
+			
+			if ( area->Contains( m_threat->GetAbsOrigin() ) )
+			{
+				// maximum danger - threat is in the area with us
+				cost += 10.0f * dangerDensity;
+				
+				if ( m_me->IsDebugging( INextBot::PATH ) )
+				{
+					area->DrawFilled( 255, 0, 0, 128 );
+				}
+			}
+			else
+			{
+				// danger proportional to range to us
+				float rangeToThreat = ( m_threat->GetAbsOrigin() - m_me->GetEntity()->GetAbsOrigin() ).Length();
+
+				if ( rangeToThreat < maxThreatRange )
+				{
+					cost += dangerDensity * ( 1.0f - ( rangeToThreat / maxThreatRange ) );
+
+					if ( m_me->IsDebugging( INextBot::PATH ) )
+					{
+						NDebugOverlay::Line( m_me->GetEntity()->GetAbsOrigin(), m_threat->GetAbsOrigin(), 255, 0, 0, true, debugDeltaT );
+					}
+				}				
+			}
+		}
+		else
+		{
+			// compute distance traveled along path so far
+			float dist;
+
+			if ( ladder )
+			{
+				const float ladderCostFactor = 100.0f;
+				dist = ladderCostFactor * ladder->m_length;
+			}
+			else
+			{
+				Vector to = area->GetCenter() - fromArea->GetCenter();
+
+				dist = to.Length();
+
+				// check for vertical discontinuities
+				Vector closeFrom, closeTo;
+				area->GetClosestPointOnArea( fromArea->GetCenter(), &closeTo );
+				fromArea->GetClosestPointOnArea( area->GetCenter(), &closeFrom );
+				
+				float deltaZ = closeTo.z - closeFrom.z;
+
+				if ( deltaZ > m_mover->GetMaxJumpHeight() )
+				{
+					// too high to jump
+					return -1.0f;
+				}
+				else if ( -deltaZ > m_mover->GetDeathDropHeight() )
+				{
+					// too far down to drop
+					return -1.0f;
+				}
+
+				// prefer to maintain our level
+				const float climbCost = 10.0f;
+				dist += climbCost * fabs( deltaZ );
+			}
+
+			cost = dist + fromArea->GetTotalCost();
+
+			
+			// Add in danger cost due to threat
+			// Assume straight line between areas and find closest point
+			// to the threat along that line segment. The distance between
+			// the threat and closest point on the line is the danger cost.		
+			
+			// path danger is CUMULATIVE
+			float dangerCost = fromArea->GetCostSoFar();
+			
+			Vector close;
+			float t;
+			CalcClosestPointOnLineSegment( m_threat->GetAbsOrigin(), area->GetCenter(), fromArea->GetCenter(), close, &t );
+			if ( t < 0.0f )
+			{
+				close = area->GetCenter();
+			}
+			else if ( t > 1.0f )
+			{
+				close = fromArea->GetCenter();
+			}
+
+			float rangeToThreat = ( m_threat->GetAbsOrigin() - close ).Length();
+
+			if ( rangeToThreat < maxThreatRange )
+			{
+				float dangerFactor = 1.0f - ( rangeToThreat / maxThreatRange );
+				dangerCost = dangerDensity * dangerFactor;
+
+				if ( m_me->IsDebugging( INextBot::PATH ) )
+				{
+					NDebugOverlay::HorzArrow( fromArea->GetCenter(), area->GetCenter(), 5, 255 * dangerFactor, 0, 0, 255, true, debugDeltaT );
+
+					Vector to = close - m_threat->GetAbsOrigin();
+					to.NormalizeInPlace();
+
+					NDebugOverlay::Line( close, close - 50.0f * to, 255, 0, 0, true, debugDeltaT );
+				}
+			}
+			
+			cost += dangerCost;
+		}
+
+		return cost;
+	}
+	
+private:	
+	INextBot *m_me;
+	ILocomotion *m_mover;
+	
+	CBaseEntity *m_threat;
+	float m_retreatRange;
+
+	enum { MAX_ADJ_AREAS = 64 };
+	
+	struct AdjInfo
+	{
+		CNavArea *area;
+		CNavLadder *ladder;
+		NavTraverseType how;		
+	};
+	
+	AdjInfo m_adjAreaVector[ MAX_ADJ_AREAS ];
+	int m_adjAreaIndex;
+	
+};
+
+
+//----------------------------------------------------------------------------------------------
+/**
+ * Periodically rebuild the path away from our threat
+ */
+inline void RetreatPath::RefreshPath( INextBot *bot, CBaseEntity *threat )
+{
+	VPROF_BUDGET( "RetreatPath::RefreshPath", "NextBot" );
+
+	if ( threat == NULL )
+	{
+		if ( bot->IsDebugging( INextBot::PATH ) )
+		{
+			DevMsg( "%3.2f: bot(#%d) CasePath::RefreshPath failed. No threat.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+		}
+		return;
+	}
+
+	// don't change our path if we're on a ladder
+	ILocomotion *mover = bot->GetLocomotionInterface();
+	if ( IsValid() && mover && mover->IsUsingLadder() )
+	{
+		if ( bot->IsDebugging( INextBot::PATH ) )
+		{
+			DevMsg( "%3.2f: bot(#%d) RetreatPath::RefreshPath failed. Bot is on a ladder.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+		}
+		return;
+	}
+
+	// the closer we get, the more accurate our path needs to be
+	Vector to = threat->GetAbsOrigin() - bot->GetPosition();
+	
+	const float minTolerance = 0.0f;
+	const float toleranceRate = 0.33f;
+	
+	float tolerance = minTolerance + toleranceRate * to.Length();
+
+	if ( !IsValid() || ( threat->GetAbsOrigin() - m_pathThreatPos ).IsLengthGreaterThan( tolerance ) )
+	{
+		if ( !m_throttleTimer.IsElapsed() )
+		{
+			// require a minimum time between repaths, as long as we have a path to follow
+			if ( bot->IsDebugging( INextBot::PATH ) )
+			{
+				DevMsg( "%3.2f: bot(#%d) RetreatPath::RefreshPath failed. Rate throttled.\n", gpGlobals->curtime, bot->GetEntity()->entindex() );
+			}
+			return;
+		}
+
+		// remember our path threat
+		m_pathThreat = threat;
+		m_pathThreatPos = threat->GetAbsOrigin();
+
+		RetreatPathBuilder retreat( bot, threat, GetMaxPathLength() );
+
+		CNavArea *goalArea = retreat.ComputePath();
+
+		if ( goalArea )
+		{
+			AssemblePrecomputedPath( bot, goalArea->GetCenter(), goalArea );
+		}	
+		else
+		{
+			// all adjacent areas are too far away - just move directly away from threat
+			Vector to = threat->GetAbsOrigin() - bot->GetPosition();
+
+			BuildTrivialPath( bot, bot->GetPosition() - to );
+		}
+			
+		const float minRepathInterval = 0.5f;
+		m_throttleTimer.Start( minRepathInterval );
+	}
+}
+
+
+
+#endif // _NEXT_BOT_RETREAT_PATH_

game/server/NextBot/Player/NextBotPlayer.cpp

@@ -0,0 +1,22 @@
+// NextBotPlayer.cpp
+// A CBasePlayer bot based on the NextBot technology
+// Author: Michael Booth, November 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "nav_mesh.h"
+
+#include "NextBot.h"
+#include "NextBotPlayer.h"
+
+#include "in_buttons.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+ConVar NextBotPlayerStop( "nb_player_stop", "0", FCVAR_CHEAT, "Stop all NextBotPlayers from updating" );
+ConVar NextBotPlayerWalk( "nb_player_walk", "0", FCVAR_CHEAT, "Force bots to walk" );
+ConVar NextBotPlayerCrouch( "nb_player_crouch", "0", FCVAR_CHEAT, "Force bots to crouch" );
+ConVar NextBotPlayerMove( "nb_player_move", "1", FCVAR_CHEAT, "Prevents bots from moving" );
+

game/server/NextBot/Player/NextBotPlayer.h

@@ -0,0 +1,910 @@
+// NextBotPlayer.h
+// A CBasePlayer bot based on the NextBot technology
+// Author: Michael Booth, November 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_PLAYER_H_
+#define _NEXT_BOT_PLAYER_H_
+
+#include "cbase.h"
+#include "gameinterface.h"
+
+#include "NextBot.h"
+#include "Path/NextBotPathFollow.h"
+//#include "NextBotPlayerBody.h"
+#include "NextBotBehavior.h"
+
+#include "in_buttons.h"
+
+extern ConVar NextBotPlayerStop;
+extern ConVar NextBotPlayerWalk;
+extern ConVar NextBotPlayerCrouch;
+extern ConVar NextBotPlayerMove;
+
+
+
+//--------------------------------------------------------------------------------------------------
+/**
+ * Instantiate a NextBot derived from CBasePlayer and spawn it into the environment.
+ * Assumes class T is derived from CBasePlayer, and has the following method that
+ * creates a new entity of type T and returns it:
+ *
+ * static CBasePlayer *T::AllocatePlayerEntity( edict_t *pEdict, const char *playerName )
+ *
+ */
+template < typename T > 
+T * NextBotCreatePlayerBot( const char *name, bool bReportFakeClient = true )
+{
+	/*
+	if ( UTIL_ClientsInGame() >= gpGlobals->maxClients )
+	{
+	Msg( "CreatePlayerBot: Failed - server is full (%d/%d clients).\n", UTIL_ClientsInGame(), gpGlobals->maxClients );
+	return NULL;
+	}
+	*/
+
+	// This is a "back door" for allocating a custom player bot entity when
+	// the engine calls ClientPutInServer (from CreateFakeClient)
+	ClientPutInServerOverride( T::AllocatePlayerEntity );
+
+	// create the bot and spawn it into the environment
+	edict_t *botEdict = engine->CreateFakeClientEx( name, bReportFakeClient );
+
+	// close the "back door"
+	ClientPutInServerOverride( NULL );
+
+	if ( botEdict == NULL )
+	{
+		Msg( "CreatePlayerBot: Unable to create bot %s - CreateFakeClient() returned NULL.\n", name );
+		return NULL;
+	}
+
+	// create an instance of the bot's class and bind it to the edict
+	T *bot = dynamic_cast< T * >( CBaseEntity::Instance( botEdict ) );
+
+	if ( bot == NULL )
+	{
+		Assert( false );
+		Error( "CreatePlayerBot: Could not Instance() from the bot edict.\n" );
+		return NULL;
+	}
+
+	bot->SetPlayerName( name );
+
+	// flag this as a fakeclient (bot)
+	bot->ClearFlags();
+	bot->AddFlag( FL_CLIENT | FL_FAKECLIENT );
+
+	return bot;
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/**
+ * Interface to access player input buttons.
+ * Unless a duration is given, each button is released at the start of the next frame.
+ * The release methods allow releasing a button before its duration has elapsed.
+ */
+class INextBotPlayerInput
+{
+public:
+	virtual void PressFireButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseFireButton( void ) = 0;
+
+	virtual void PressAltFireButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseAltFireButton( void ) = 0;
+
+	virtual void PressMeleeButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseMeleeButton( void ) = 0;
+
+	virtual void PressSpecialFireButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseSpecialFireButton( void ) = 0;
+
+	virtual void PressUseButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseUseButton( void ) = 0;
+
+	virtual void PressReloadButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseReloadButton( void ) = 0;
+	
+	virtual void PressForwardButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseForwardButton( void ) = 0;
+
+	virtual void PressBackwardButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseBackwardButton( void ) = 0;
+
+	virtual void PressLeftButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseLeftButton( void ) = 0;
+
+	virtual void PressRightButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseRightButton( void ) = 0;
+
+	virtual void PressJumpButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseJumpButton( void ) = 0;
+
+	virtual void PressCrouchButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseCrouchButton( void ) = 0;
+
+	virtual void PressWalkButton( float duration = -1.0f ) = 0;
+	virtual void ReleaseWalkButton( void ) = 0;
+
+	virtual void SetButtonScale( float forward, float right ) = 0;
+};
+
+
+//--------------------------------------------------------------------------------------------------
+/**
+ * Drive a CBasePlayer-derived entity via NextBot logic
+ */
+template < typename PlayerType >
+class NextBotPlayer : public PlayerType, public INextBot, public INextBotPlayerInput
+{
+public:
+	DECLARE_CLASS( NextBotPlayer, PlayerType );
+
+	NextBotPlayer( void );
+	virtual ~NextBotPlayer();
+
+	virtual void Spawn( void );
+
+	virtual void SetSpawnPoint( CBaseEntity *spawnPoint );						// define place in environment where bot will (re)spawn
+	virtual CBaseEntity		*EntSelectSpawnPoint( void );
+
+	virtual void PhysicsSimulate( void );
+
+	virtual bool IsNetClient( void ) const { return false; }					// Bots should return FALSE for this, they can't receive NET messages
+	virtual bool IsFakeClient( void ) const { return true; }
+	virtual bool IsBot( void ) const { return true; }
+	virtual INextBot *MyNextBotPointer( void ) { return this; }
+
+	// this is valid because the templatized PlayerType must be derived from CBasePlayer, which is derived from CBaseCombatCharacter
+	virtual CBaseCombatCharacter *GetEntity( void ) const { return ( PlayerType * )this; }	
+
+	virtual bool IsRemovedOnReset( void ) const { return false; }				// remove this bot when the NextBot manager calls Reset
+
+	virtual bool IsDormantWhenDead( void ) const	{ return true; }			// should this player-bot continue to update itself when dead (respawn logic, etc)
+
+	// allocate a bot and bind it to the edict
+	static CBasePlayer *AllocatePlayerEntity( edict_t *edict, const char *playerName );
+
+	//------------------------------------------------------------------------
+	// utility methods
+	float GetDistanceBetween( CBaseEntity *other ) const;						// return distance between us and the given entity
+	bool IsDistanceBetweenLessThan( CBaseEntity *other, float range ) const;	// return true if distance between is less than the given value
+	bool IsDistanceBetweenGreaterThan( CBaseEntity *other, float range ) const;	// return true if distance between is greater than the given value
+
+	float GetDistanceBetween( const Vector &target ) const;						// return distance between us and the given entity
+	bool IsDistanceBetweenLessThan( const Vector &target, float range ) const;	// return true if distance between is less than the given value
+	bool IsDistanceBetweenGreaterThan( const Vector &target, float range ) const;	// return true if distance between is greater than the given value
+
+	//------------------------------------------------------------------------
+	// INextBotPlayerInput
+	virtual void PressFireButton( float duration = -1.0f );
+	virtual void ReleaseFireButton( void );
+
+	virtual void PressAltFireButton( float duration = -1.0f );
+	virtual void ReleaseAltFireButton( void );
+
+	virtual void PressMeleeButton( float duration = -1.0f );
+	virtual void ReleaseMeleeButton( void );
+
+	virtual void PressSpecialFireButton( float duration = -1.0f );
+	virtual void ReleaseSpecialFireButton( void );
+
+	virtual void PressUseButton( float duration = -1.0f );
+	virtual void ReleaseUseButton( void );
+
+	virtual void PressReloadButton( float duration = -1.0f );
+	virtual void ReleaseReloadButton( void );
+
+	virtual void PressForwardButton( float duration = -1.0f );
+	virtual void ReleaseForwardButton( void );
+
+	virtual void PressBackwardButton( float duration = -1.0f );
+	virtual void ReleaseBackwardButton( void );
+
+	virtual void PressLeftButton( float duration = -1.0f );
+	virtual void ReleaseLeftButton( void );
+
+	virtual void PressRightButton( float duration = -1.0f );
+	virtual void ReleaseRightButton( void );
+
+	virtual void PressJumpButton( float duration = -1.0f );
+	virtual void ReleaseJumpButton( void );
+
+	virtual void PressCrouchButton( float duration = -1.0f );
+	virtual void ReleaseCrouchButton( void );
+
+	virtual void PressWalkButton( float duration = -1.0f );
+	virtual void ReleaseWalkButton( void );
+
+	virtual void SetButtonScale( float forward, float right );
+
+	//------------------------------------------------------------------------
+	// Event hooks into NextBot system 
+	virtual int OnTakeDamage_Alive( const CTakeDamageInfo &info );
+	virtual int OnTakeDamage_Dying( const CTakeDamageInfo &info );
+	virtual void Event_Killed( const CTakeDamageInfo &info );
+	virtual void HandleAnimEvent( animevent_t *event );
+	virtual void OnNavAreaChanged( CNavArea *enteredArea, CNavArea *leftArea );	// invoked (by UpdateLastKnownArea) when we enter a new nav area (or it is reset to NULL)
+	virtual void Touch( CBaseEntity *other );
+	virtual void Weapon_Equip( CBaseCombatWeapon *weapon );						// for OnPickUp
+	virtual	void Weapon_Drop( CBaseCombatWeapon *weapon, const Vector *target, const Vector *velocity );	// for OnDrop
+	virtual void OnMainActivityComplete( Activity newActivity, Activity oldActivity );
+	virtual void OnMainActivityInterrupted( Activity newActivity, Activity oldActivity );
+	//------------------------------------------------------------------------
+
+	bool IsAbleToAutoCenterOnLadders( void ) const;
+
+	virtual void AvoidPlayers( CUserCmd *pCmd ) { }								// some game types allow players to pass through each other, this method pushes them apart
+
+public:
+	// begin INextBot ------------------------------------------------------------------------------------------------------------------
+	virtual void Update( void );												// (EXTEND) update internal state
+
+protected:
+	int m_inputButtons;					// this is still needed to guarantee each button press is captured at least once
+	int m_prevInputButtons;
+	CountdownTimer m_fireButtonTimer;
+	CountdownTimer m_meleeButtonTimer;
+	CountdownTimer m_specialFireButtonTimer;
+	CountdownTimer m_useButtonTimer;
+	CountdownTimer m_reloadButtonTimer;
+	CountdownTimer m_forwardButtonTimer;
+	CountdownTimer m_backwardButtonTimer;
+	CountdownTimer m_leftButtonTimer;
+	CountdownTimer m_rightButtonTimer;
+	CountdownTimer m_jumpButtonTimer;
+	CountdownTimer m_crouchButtonTimer;
+	CountdownTimer m_walkButtonTimer;
+	CountdownTimer m_buttonScaleTimer;
+	IntervalTimer m_burningTimer;		// how long since we were last burning
+	float m_forwardScale;
+	float m_rightScale;
+	CHandle< CBaseEntity > m_spawnPointEntity;
+};
+
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::SetSpawnPoint( CBaseEntity *spawnPoint )
+{
+	m_spawnPointEntity = spawnPoint;
+}
+
+template < typename PlayerType >
+inline CBaseEntity *NextBotPlayer< PlayerType >::EntSelectSpawnPoint( void )
+{
+	if ( m_spawnPointEntity != NULL )
+		return m_spawnPointEntity;
+
+	return BaseClass::EntSelectSpawnPoint();
+}
+
+template < typename PlayerType >
+inline float NextBotPlayer< PlayerType >::GetDistanceBetween( CBaseEntity *other ) const
+{
+	return (this->GetAbsOrigin() - other->GetAbsOrigin()).Length();
+}
+
+template < typename PlayerType >
+inline bool NextBotPlayer< PlayerType >::IsDistanceBetweenLessThan( CBaseEntity *other, float range ) const
+{
+	return (this->GetAbsOrigin() - other->GetAbsOrigin()).IsLengthLessThan( range );
+}
+
+template < typename PlayerType >
+inline bool NextBotPlayer< PlayerType >::IsDistanceBetweenGreaterThan( CBaseEntity *other, float range ) const
+{
+	return (this->GetAbsOrigin() - other->GetAbsOrigin()).IsLengthGreaterThan( range );
+}
+
+template < typename PlayerType >
+inline float NextBotPlayer< PlayerType >::GetDistanceBetween( const Vector &target ) const
+{
+	return (this->GetAbsOrigin() - target).Length();
+}
+
+template < typename PlayerType >
+inline bool NextBotPlayer< PlayerType >::IsDistanceBetweenLessThan( const Vector &target, float range ) const
+{
+	return (this->GetAbsOrigin() - target).IsLengthLessThan( range );
+}
+
+template < typename PlayerType >
+inline bool NextBotPlayer< PlayerType >::IsDistanceBetweenGreaterThan( const Vector &target, float range ) const
+{
+	return (this->GetAbsOrigin() - target).IsLengthGreaterThan( range );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressFireButton( float duration )
+{
+	m_inputButtons |= IN_ATTACK;
+	m_fireButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseFireButton( void )
+{
+	m_inputButtons &= ~IN_ATTACK;
+	m_fireButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressAltFireButton( float duration )
+{
+	PressMeleeButton( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseAltFireButton( void )
+{
+	ReleaseMeleeButton();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressMeleeButton( float duration )
+{
+	m_inputButtons |= IN_ATTACK2;
+	m_meleeButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseMeleeButton( void )
+{
+	m_inputButtons &= ~IN_ATTACK2;
+	m_meleeButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressSpecialFireButton( float duration )
+{
+	m_inputButtons |= IN_ATTACK3;
+	m_specialFireButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseSpecialFireButton( void )
+{
+	m_inputButtons &= ~IN_ATTACK3;
+	m_specialFireButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressUseButton( float duration )
+{
+	m_inputButtons |= IN_USE;
+	m_useButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseUseButton( void )
+{
+	m_inputButtons &= ~IN_USE;
+	m_useButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressReloadButton( float duration )
+{
+	m_inputButtons |= IN_RELOAD;
+	m_reloadButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseReloadButton( void )
+{
+	m_inputButtons &= ~IN_RELOAD;
+	m_reloadButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressJumpButton( float duration )
+{
+	m_inputButtons |= IN_JUMP;
+	m_jumpButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseJumpButton( void )
+{
+	m_inputButtons &= ~IN_JUMP;
+	m_jumpButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressCrouchButton( float duration )
+{
+	m_inputButtons |= IN_DUCK;
+	m_crouchButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseCrouchButton( void )
+{
+	m_inputButtons &= ~IN_DUCK;
+	m_crouchButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressWalkButton( float duration )
+{
+	m_inputButtons |= IN_SPEED;
+	m_walkButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseWalkButton( void )
+{
+	m_inputButtons &= ~IN_SPEED;
+	m_walkButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressForwardButton( float duration )
+{
+	m_inputButtons |= IN_FORWARD;
+	m_forwardButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseForwardButton( void )
+{
+	m_inputButtons &= ~IN_FORWARD;
+	m_forwardButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressBackwardButton( float duration )
+{
+	m_inputButtons |= IN_BACK;
+	m_backwardButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseBackwardButton( void )
+{
+	m_inputButtons &= ~IN_BACK;
+	m_backwardButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressLeftButton( float duration )
+{
+	m_inputButtons |= IN_MOVELEFT;
+	m_leftButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseLeftButton( void )
+{
+	m_inputButtons &= ~IN_MOVELEFT;
+	m_leftButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PressRightButton( float duration )
+{
+	m_inputButtons |= IN_MOVERIGHT;
+	m_rightButtonTimer.Start( duration );
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::ReleaseRightButton( void )
+{
+	m_inputButtons &= ~IN_MOVERIGHT;
+	m_rightButtonTimer.Invalidate();
+}
+
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::SetButtonScale( float forward, float right )
+{
+	m_forwardScale = forward;
+	m_rightScale = right;
+	m_buttonScaleTimer.Start( 0.01 );
+}
+
+
+
+//-----------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline NextBotPlayer< PlayerType >::NextBotPlayer( void )
+{
+	m_prevInputButtons = 0;
+	m_inputButtons = 0;
+	m_burningTimer.Invalidate();
+	m_spawnPointEntity = NULL;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline NextBotPlayer< PlayerType >::~NextBotPlayer()
+{
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::Spawn( void )
+{
+	engine->SetFakeClientConVarValue( this->edict(), "cl_autohelp", "0" );
+
+	m_prevInputButtons = m_inputButtons = 0;
+	m_fireButtonTimer.Invalidate();
+	m_meleeButtonTimer.Invalidate();
+	m_specialFireButtonTimer.Invalidate();
+	m_useButtonTimer.Invalidate();
+	m_reloadButtonTimer.Invalidate();
+	m_forwardButtonTimer.Invalidate();
+	m_backwardButtonTimer.Invalidate();
+	m_leftButtonTimer.Invalidate();
+	m_rightButtonTimer.Invalidate();
+	m_jumpButtonTimer.Invalidate();
+	m_crouchButtonTimer.Invalidate();
+	m_walkButtonTimer.Invalidate();
+	m_buttonScaleTimer.Invalidate();
+	m_forwardScale = m_rightScale = 0.04;
+	m_burningTimer.Invalidate();
+
+	// reset first, because Spawn() may access various interfaces
+	INextBot::Reset();
+
+	BaseClass::Spawn();
+}
+
+
+
+//-----------------------------------------------------------------------------------------------------
+inline void _NextBot_BuildUserCommand( CUserCmd *cmd, const QAngle &viewangles, float forwardmove, float sidemove, float upmove, int buttons, byte impulse )
+{
+	Q_memset( cmd, 0, sizeof( CUserCmd ) );
+
+	cmd->command_number = gpGlobals->tickcount;
+	cmd->forwardmove = forwardmove;
+	cmd->sidemove = sidemove;
+	cmd->upmove = upmove;
+	cmd->buttons = buttons;
+	cmd->impulse = impulse;
+
+	VectorCopy( viewangles, cmd->viewangles );
+
+	cmd->random_seed = random->RandomInt( 0, 0x7fffffff );
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::PhysicsSimulate( void )
+{
+	VPROF( "NextBotPlayer::PhysicsSimulate" );
+
+	// Make sure not to simulate this guy twice per frame
+	if ( PlayerType::m_nSimulationTick == gpGlobals->tickcount )
+	{
+		return;
+	}
+
+	if ( engine->IsPaused() )
+	{
+		// We're paused - don't add new commands
+		PlayerType::PhysicsSimulate();
+		return;
+	}
+
+	if ( ( IsDormantWhenDead() && PlayerType::m_lifeState == LIFE_DEAD ) || NextBotStop.GetBool() )
+	{
+		// death animation complete - nothing left to do except let PhysicsSimulate run PreThink etc
+		PlayerType::PhysicsSimulate();
+		return;
+	}
+
+	int inputButtons;
+	//
+	// Update bot behavior
+	//
+	if ( BeginUpdate() )
+	{
+		Update();
+
+		// build button bits
+		if ( !m_fireButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_ATTACK;
+
+		if ( !m_meleeButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_ATTACK2;
+
+		if ( !m_specialFireButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_ATTACK3;
+
+		if ( !m_useButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_USE;
+
+		if ( !m_reloadButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_RELOAD;
+
+		if ( !m_forwardButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_FORWARD;
+
+		if ( !m_backwardButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_BACK;
+
+		if ( !m_leftButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_MOVELEFT;
+
+		if ( !m_rightButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_MOVERIGHT;
+
+		if ( !m_jumpButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_JUMP;
+
+		if ( !m_crouchButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_DUCK;
+
+		if ( !m_walkButtonTimer.IsElapsed() )
+			m_inputButtons |= IN_SPEED;
+
+		m_prevInputButtons = m_inputButtons;
+		inputButtons = m_inputButtons;
+
+		EndUpdate();
+	}
+	else
+	{
+		// HACK: Smooth out body animations
+		GetBodyInterface()->Update();
+
+		// keep buttons pressed between Update() calls (m_prevInputButtons),
+		// and include any button presses that occurred this tick (m_inputButtons).
+		inputButtons = m_prevInputButtons | m_inputButtons;
+	}
+
+	//
+	// Convert NextBot locomotion and posture into
+	// player commands
+	//
+	IBody *body = GetBodyInterface();
+	ILocomotion *mover = GetLocomotionInterface();
+
+	if ( body->IsActualPosture( IBody::CROUCH ) )
+	{
+		inputButtons |= IN_DUCK;
+	}
+
+	float forwardSpeed = 0.0f;
+	float strafeSpeed = 0.0f;
+	float verticalSpeed = ( m_inputButtons & IN_JUMP ) ? mover->GetRunSpeed() : 0.0f;
+
+	if ( inputButtons & IN_FORWARD )
+	{
+		forwardSpeed = mover->GetRunSpeed();		
+	}
+	else if ( inputButtons & IN_BACK )
+	{
+		forwardSpeed = -mover->GetRunSpeed();
+	}
+
+	if ( inputButtons & IN_MOVELEFT )
+	{
+		strafeSpeed = -mover->GetRunSpeed();		
+	}
+	else if ( inputButtons & IN_MOVERIGHT )
+	{
+		strafeSpeed = mover->GetRunSpeed();
+	}
+
+	if ( NextBotPlayerWalk.GetBool() )
+	{
+		inputButtons |= IN_SPEED;
+	}
+
+	if ( NextBotPlayerCrouch.GetBool() )
+	{
+		inputButtons |= IN_DUCK;
+	}
+
+	if ( !m_buttonScaleTimer.IsElapsed() )
+	{
+		forwardSpeed = mover->GetRunSpeed() * m_forwardScale;
+		strafeSpeed = mover->GetRunSpeed() * m_rightScale;
+	}
+
+	if ( !NextBotPlayerMove.GetBool() )
+	{
+		inputButtons &= ~(IN_FORWARD | IN_BACK | IN_MOVELEFT | IN_MOVERIGHT | IN_JUMP );
+		forwardSpeed = 0.0f;
+		strafeSpeed = 0.0f;
+		verticalSpeed = 0.0f;
+	}
+
+	QAngle angles = this->EyeAngles();
+
+#ifdef TERROR
+	if ( IsStunned() )
+	{
+		inputButtons &= ~(IN_FORWARD | IN_BACK | IN_MOVELEFT | IN_MOVERIGHT | IN_JUMP | IN_DUCK );
+	}
+
+	// "Look" in the direction we're climbing/stumbling etc.  We can't do anything anyway, and it
+	// keeps motion extraction working.
+	if ( IsRenderYawOverridden() && IsMotionControlledXY( GetMainActivity() ) )
+	{
+		angles[YAW] = GetOverriddenRenderYaw();
+	}
+#endif
+
+	// construct a "command" to move the player
+	CUserCmd userCmd;
+	_NextBot_BuildUserCommand( &userCmd, angles, forwardSpeed, strafeSpeed, verticalSpeed, inputButtons, 0 );
+
+	AvoidPlayers( &userCmd );
+
+	// allocate a new command and add it to the player's list of command to process
+	this->ProcessUsercmds( &userCmd, 1, 1, 0, false );
+
+	m_inputButtons = 0;
+
+	// actually execute player commands and do player physics
+	PlayerType::PhysicsSimulate();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::OnNavAreaChanged( CNavArea *enteredArea, CNavArea *leftArea )
+{
+	// propagate into NextBot responders
+	INextBotEventResponder::OnNavAreaChanged( enteredArea, leftArea );
+
+	BaseClass::OnNavAreaChanged( enteredArea, leftArea );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::Touch( CBaseEntity *other )
+{
+	if ( ShouldTouch( other ) )
+	{
+		// propagate touch into NextBot event responders
+		trace_t result;
+		result = this->GetTouchTrace();
+		OnContact( other, &result );
+	}
+
+	BaseClass::Touch( other );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::Weapon_Equip( CBaseCombatWeapon *weapon )
+{
+#ifdef TERROR
+	// TODO: Reimplement GetDroppingPlayer() into GetLastOwner()
+	OnPickUp( weapon, weapon->GetDroppingPlayer() );
+#else
+	OnPickUp( weapon, NULL );
+#endif
+
+	BaseClass::Weapon_Equip( weapon );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::Weapon_Drop( CBaseCombatWeapon *weapon, const Vector *target, const Vector *velocity )
+{
+	OnDrop( weapon );
+
+	BaseClass::Weapon_Drop( weapon, target, velocity );
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::OnMainActivityComplete( Activity newActivity, Activity oldActivity )
+{
+#ifdef TERROR
+	BaseClass::OnMainActivityComplete( newActivity, oldActivity );
+#endif
+	OnAnimationActivityComplete( oldActivity );
+}
+
+
+//--------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::OnMainActivityInterrupted( Activity newActivity, Activity oldActivity )
+{
+#ifdef TERROR
+	BaseClass::OnMainActivityInterrupted( newActivity, oldActivity );
+#endif
+	OnAnimationActivityInterrupted( oldActivity );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::Update( void )
+{
+	// don't spend CPU updating if this Survivor is dead
+	if ( ( this->IsAlive() || !IsDormantWhenDead() ) && !NextBotPlayerStop.GetBool() )
+	{
+		INextBot::Update();	
+	}
+}
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline bool NextBotPlayer< PlayerType >::IsAbleToAutoCenterOnLadders( void ) const
+{
+	const ILocomotion *locomotion = GetLocomotionInterface();
+	return locomotion && locomotion->IsAbleToAutoCenterOnLadder();
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline int NextBotPlayer< PlayerType >::OnTakeDamage_Alive( const CTakeDamageInfo &info )
+{
+	if ( info.GetDamageType() & DMG_BURN )
+	{
+		if ( !m_burningTimer.HasStarted() || m_burningTimer.IsGreaterThen( 1.0f ) )
+		{
+			// emit ignite event periodically as long as we are burning
+			OnIgnite();
+			m_burningTimer.Start();
+		}
+	}
+
+	// propagate event to components
+	OnInjured( info );
+
+	return BaseClass::OnTakeDamage_Alive( info );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline int NextBotPlayer< PlayerType >::OnTakeDamage_Dying( const CTakeDamageInfo &info )
+{
+	if ( info.GetDamageType() & DMG_BURN )
+	{
+		if ( !m_burningTimer.HasStarted() || m_burningTimer.IsGreaterThen( 1.0f ) )
+		{
+			// emit ignite event periodically as long as we are burning
+			OnIgnite();
+			m_burningTimer.Start();
+		}
+	}
+
+	// propagate event to components
+	OnInjured( info );
+
+	return BaseClass::OnTakeDamage_Dying( info );
+}
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::Event_Killed( const CTakeDamageInfo &info )
+{
+	// propagate event to my components
+	OnKilled( info );
+
+	BaseClass::Event_Killed( info );
+}
+
+
+
+//----------------------------------------------------------------------------------------------------------
+template < typename PlayerType >
+inline void NextBotPlayer< PlayerType >::HandleAnimEvent( animevent_t *event )
+{
+	// propagate event to components
+	OnAnimationEvent( event );
+
+	BaseClass::HandleAnimEvent( event );
+}
+
+
+#endif // _NEXT_BOT_PLAYER_H_

game/server/NextBot/Player/NextBotPlayerBody.cpp

@@ -0,0 +1,881 @@
+// NextBotPlayerBody.cpp
+// Implementation of Body interface for CBasePlayer-derived classes
+// Author: Michael Booth, October 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBot.h"
+#include "NextBotPlayerBody.h"
+#include "NextBotPlayer.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+ConVar nb_saccade_time( "nb_saccade_time", "0.1", FCVAR_CHEAT );
+ConVar nb_saccade_speed( "nb_saccade_speed", "1000", FCVAR_CHEAT );
+ConVar nb_head_aim_steady_max_rate( "nb_head_aim_steady_max_rate", "100", FCVAR_CHEAT );
+ConVar nb_head_aim_settle_duration( "nb_head_aim_settle_duration", "0.3", FCVAR_CHEAT );
+ConVar nb_head_aim_resettle_angle( "nb_head_aim_resettle_angle", "100", FCVAR_CHEAT, "After rotating through this angle, the bot pauses to 'recenter' its virtual mouse on its virtual mousepad" );
+ConVar nb_head_aim_resettle_time( "nb_head_aim_resettle_time", "0.3", FCVAR_CHEAT, "How long the bot pauses to 'recenter' its virtual mouse on its virtual mousepad" );
+
+
+//-----------------------------------------------------------------------------------------------
+/** 
+ * A useful reply for IBody::AimHeadTowards.  When the
+ * head is aiming on target, press the fire button.
+ */
+void PressFireButtonReply::OnSuccess( INextBot *bot )
+{
+	INextBotPlayerInput *playerInput = dynamic_cast< INextBotPlayerInput * >( bot->GetEntity() );
+	if ( playerInput )
+	{
+		playerInput->PressFireButton();
+	}
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/** 
+ * A useful reply for IBody::AimHeadTowards.  When the
+ * head is aiming on target, press the alternate fire button.
+ */
+void PressAltFireButtonReply::OnSuccess( INextBot *bot )
+{
+	INextBotPlayerInput *playerInput = dynamic_cast< INextBotPlayerInput * >( bot->GetEntity() );
+	if ( playerInput )
+	{
+		playerInput->PressMeleeButton();
+	}
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/** 
+ * A useful reply for IBody::AimHeadTowards.  When the
+ * head is aiming on target, press the jump button.
+ */
+void PressJumpButtonReply::OnSuccess( INextBot *bot )
+{
+	INextBotPlayerInput *playerInput = dynamic_cast< INextBotPlayerInput * >( bot->GetEntity() );
+	if ( playerInput )
+	{
+		playerInput->PressJumpButton();
+	}
+}
+
+
+//-----------------------------------------------------------------------------------------------
+//-----------------------------------------------------------------------------------------------
+PlayerBody::PlayerBody( INextBot *bot ) : IBody( bot )
+{
+	m_player = static_cast< CBasePlayer * >( bot->GetEntity() );
+}
+
+
+//-----------------------------------------------------------------------------------------------
+PlayerBody::~PlayerBody()
+{
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * reset to initial state
+ */
+void PlayerBody::Reset( void )
+{
+	m_posture = STAND;
+
+	m_lookAtPos = vec3_origin;
+	m_lookAtSubject = NULL;
+	m_lookAtReplyWhenAimed = NULL;
+	m_lookAtVelocity = vec3_origin;
+	m_lookAtExpireTimer.Invalidate();
+
+	m_lookAtPriority = BORING;
+	m_lookAtExpireTimer.Invalidate();
+	m_lookAtDurationTimer.Invalidate();
+	m_isSightedIn = false;
+	m_hasBeenSightedIn = false;
+	m_headSteadyTimer.Invalidate();
+	m_priorAngles = vec3_angle;
+	m_anchorRepositionTimer.Invalidate();
+	m_anchorForward = vec3_origin;
+}
+
+ConVar bot_mimic( "bot_mimic", "0", 0, "Bot uses usercmd of player by index." );
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Update internal state.
+ * Do this every tick to keep head aims smooth and accurate
+ */
+void PlayerBody::Upkeep( void )
+{
+	// If mimicking the player, don't modify the view angles.
+	static ConVarRef bot_mimic( "bot_mimic" );
+	if ( bot_mimic.IsValid() && bot_mimic.GetBool() )
+		return;
+
+	const float deltaT = gpGlobals->frametime;
+	if ( deltaT < 0.00001f )
+	{
+		return;
+	}
+
+	CBasePlayer *player = ( CBasePlayer * )GetBot()->GetEntity();
+
+	// get current view angles
+	QAngle currentAngles = player->EyeAngles() + player->GetPunchAngle();
+
+	// track when our head is "steady"
+	bool isSteady = true;
+
+	float actualPitchRate = AngleDiff( currentAngles.x, m_priorAngles.x );
+	if ( abs( actualPitchRate ) > nb_head_aim_steady_max_rate.GetFloat() * deltaT )
+	{
+		isSteady = false;
+	}
+	else
+	{
+		float actualYawRate = AngleDiff( currentAngles.y, m_priorAngles.y );
+
+		if ( abs( actualYawRate ) > nb_head_aim_steady_max_rate.GetFloat() * deltaT )
+		{
+			isSteady = false;
+		}
+	}
+
+	if ( isSteady )
+	{
+		if ( !m_headSteadyTimer.HasStarted() )
+		{
+			m_headSteadyTimer.Start();
+		}
+	}
+	else
+	{
+		m_headSteadyTimer.Invalidate();
+	}
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+	{
+		if ( IsHeadSteady() )
+		{
+			const float maxTime = 3.0f;
+			float t = GetHeadSteadyDuration() / maxTime;
+			t = clamp( t, 0.f, 1.0f );
+			NDebugOverlay::Circle( player->EyePosition(), t * 10.0f, 0, 255, 0, 255, true, 2.0f * deltaT );
+		}
+	}
+
+	m_priorAngles = currentAngles;
+
+
+	// if our current look-at has expired, don't change our aim further
+	if ( m_hasBeenSightedIn && m_lookAtExpireTimer.IsElapsed() )
+	{
+		return;
+	}
+
+	// simulate limited range of mouse movements
+	// compute the angle change from "center"
+	const Vector &forward = GetViewVector();
+	float deltaAngle = RAD2DEG( acos( DotProduct( forward, m_anchorForward ) ) );
+	if ( deltaAngle > nb_head_aim_resettle_angle.GetFloat() )
+	{
+		// time to recenter our 'virtual mouse'
+		m_anchorRepositionTimer.Start( RandomFloat( 0.9f, 1.1f ) * nb_head_aim_resettle_time.GetFloat() );
+		m_anchorForward = forward;
+		return;
+	}
+
+	// if we're currently recentering our "virtual mouse", wait
+	if ( m_anchorRepositionTimer.HasStarted() && !m_anchorRepositionTimer.IsElapsed() )
+	{
+		return;
+	}
+	m_anchorRepositionTimer.Invalidate();
+
+
+	// if we have a subject, update lookat point
+	CBaseEntity *subject = m_lookAtSubject;
+	if ( subject )
+	{
+		if ( m_lookAtTrackingTimer.IsElapsed() )
+		{
+			// update subject tracking by periodically estimating linear aim velocity, allowing for "slop" between updates
+			Vector desiredLookAtPos;
+
+			if ( subject->MyCombatCharacterPointer() ) 
+			{
+				desiredLookAtPos = GetBot()->GetIntentionInterface()->SelectTargetPoint( GetBot(), subject->MyCombatCharacterPointer() );
+			}
+			else
+			{
+				desiredLookAtPos = subject->WorldSpaceCenter();
+			}
+
+			desiredLookAtPos += GetHeadAimSubjectLeadTime() * subject->GetAbsVelocity();
+
+			Vector errorVector = desiredLookAtPos - m_lookAtPos;
+			float error = errorVector.NormalizeInPlace();
+
+			float trackingInterval = GetHeadAimTrackingInterval();
+			if ( trackingInterval < deltaT )
+			{
+				trackingInterval = deltaT;
+			}
+
+			float errorVel = error / trackingInterval;
+
+			m_lookAtVelocity = ( errorVel * errorVector ) + subject->GetAbsVelocity();
+
+			m_lookAtTrackingTimer.Start( RandomFloat( 0.8f, 1.2f ) * trackingInterval );
+		}
+
+		m_lookAtPos += deltaT * m_lookAtVelocity;
+	}
+
+
+	// aim view towards last look at point
+	Vector to = m_lookAtPos - GetEyePosition();
+	to.NormalizeInPlace();
+
+	QAngle desiredAngles;
+	VectorAngles( to, desiredAngles );
+
+	QAngle angles;
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+	{
+		NDebugOverlay::Line( GetEyePosition(), GetEyePosition() + 100.0f * forward, 255, 255, 0, false, 2.0f * deltaT );
+
+		float thickness = isSteady ? 2.0f : 3.0f;
+		int r = m_isSightedIn ? 255 : 0;
+		int g = subject ? 255 : 0;
+		NDebugOverlay::HorzArrow( GetEyePosition(), m_lookAtPos, thickness, r, g, 255, 255, false, 2.0f * deltaT );
+	}
+
+	
+	const float onTargetTolerance = 0.98f;
+	float dot = DotProduct( forward, to );
+	if ( dot > onTargetTolerance )
+	{
+		// on target
+		m_isSightedIn = true;
+
+		if ( !m_hasBeenSightedIn )
+		{
+			m_hasBeenSightedIn = true;
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+			{
+				ConColorMsg( Color( 255, 100, 0, 255 ), "%3.2f: %s Look At SIGHTED IN\n",
+								gpGlobals->curtime,
+								m_player->GetPlayerName() );
+			}
+		}
+
+		if ( m_lookAtReplyWhenAimed )
+		{
+			m_lookAtReplyWhenAimed->OnSuccess( GetBot() );
+			m_lookAtReplyWhenAimed = NULL;
+		}
+	}
+	else
+	{
+		// off target
+		m_isSightedIn = false;
+	}
+
+
+	// rotate view at a rate proportional to how far we have to turn
+	// max rate if we need to turn around
+	// want first derivative continuity of rate as our aim hits to avoid pop
+	float approachRate = GetMaxHeadAngularVelocity();
+
+	const float easeOut = 0.7f;
+	if ( dot > easeOut )
+	{
+		float t = RemapVal( dot, easeOut, 1.0f, 1.0f, 0.02f );
+		const float halfPI = 1.57f;
+		approachRate *= sin( halfPI * t );
+	}
+
+	const float easeInTime = 0.25f;
+	if ( m_lookAtDurationTimer.GetElapsedTime() < easeInTime )
+	{
+		approachRate *= m_lookAtDurationTimer.GetElapsedTime() / easeInTime;
+	}
+
+	angles.y = ApproachAngle( desiredAngles.y, currentAngles.y, approachRate * deltaT );
+	angles.x = ApproachAngle( desiredAngles.x, currentAngles.x, 0.5f * approachRate * deltaT );
+	angles.z = 0.0f;
+
+	// back out "punch angle"
+	angles -= player->GetPunchAngle();
+
+	angles.x = AngleNormalize( angles.x );
+	angles.y = AngleNormalize( angles.y );
+
+	player->SnapEyeAngles( angles );
+}
+
+
+//-----------------------------------------------------------------------------------------------
+bool PlayerBody::SetPosition( const Vector &pos )
+{
+	m_player->SetAbsOrigin( pos );	
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return the eye position of the bot in world coordinates
+ */
+const Vector &PlayerBody::GetEyePosition( void ) const
+{
+	m_eyePos = m_player->EyePosition();
+	return m_eyePos;
+}
+
+
+CBaseEntity *PlayerBody::GetEntity( void )
+{
+	return m_player;
+}
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return the view unit direction vector in world coordinates
+ */
+const Vector &PlayerBody::GetViewVector( void ) const
+{
+	m_player->EyeVectors( &m_viewVector );
+	return m_viewVector;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Aim the bot's head towards the given goal
+ */
+void PlayerBody::AimHeadTowards( const Vector &lookAtPos, LookAtPriorityType priority, float duration, INextBotReply *replyWhenAimed, const char *reason )
+{
+	if ( duration <= 0.0f )
+	{
+		duration = 0.1f;
+	}
+
+	// don't spaz our aim around
+	if ( m_lookAtPriority == priority )
+	{
+		if ( !IsHeadSteady() || GetHeadSteadyDuration() < nb_head_aim_settle_duration.GetFloat() )
+		{
+			// we're still finishing a look-at at the same priority
+			if ( replyWhenAimed ) 
+			{
+				replyWhenAimed->OnFail( GetBot(), INextBotReply::DENIED );
+			}
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+			{
+				ConColorMsg( Color( 255, 0, 0, 255 ), "%3.2f: %s Look At '%s' rejected - previous aim not %s\n",
+								gpGlobals->curtime,
+								m_player->GetPlayerName(),
+								reason,
+								IsHeadSteady() ? "settled long enough" : "head-steady" );
+			}
+			return;
+		}
+	}
+
+	// don't short-circuit if "sighted in" to avoid rapid view jitter
+	if ( m_lookAtPriority > priority && !m_lookAtExpireTimer.IsElapsed() )
+	{
+		// higher priority lookat still ongoing 
+		if ( replyWhenAimed ) 
+		{
+			replyWhenAimed->OnFail( GetBot(), INextBotReply::DENIED );
+		}
+
+		if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+		{
+			ConColorMsg( Color( 255, 0, 0, 255 ), "%3.2f: %s Look At '%s' rejected - higher priority aim in progress\n",
+							gpGlobals->curtime,
+							m_player->GetPlayerName(),
+							reason );
+		}
+		return;
+	}
+
+	if ( m_lookAtReplyWhenAimed )
+	{
+		// in-process aim was interrupted
+		m_lookAtReplyWhenAimed->OnFail( GetBot(), INextBotReply::INTERRUPTED );
+	}
+
+	m_lookAtReplyWhenAimed = replyWhenAimed;
+	m_lookAtExpireTimer.Start( duration );
+
+	// if given the same point, just update priority
+	const float epsilon = 1.0f;
+	if ( ( m_lookAtPos - lookAtPos ).IsLengthLessThan( epsilon ) )
+	{
+		m_lookAtPriority = priority;
+		return;
+	}
+
+	// new look-at point
+
+	m_lookAtPos = lookAtPos;
+	m_lookAtSubject = NULL;
+
+	m_lookAtPriority = priority;
+	m_lookAtDurationTimer.Start();
+
+	// do NOT clear this here, or continuous calls to AimHeadTowards will keep IsHeadAimingOnTarget returning false all of the time
+	// m_isSightedIn = false;
+
+	m_hasBeenSightedIn = false;
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+	{
+		NDebugOverlay::Cross3D( lookAtPos, 2.0f, 255, 255, 100, true, 2.0f * duration );
+		
+		const char *priName = "";
+		switch( priority )
+		{
+			case BORING:		priName = "BORING"; break;
+			case INTERESTING:	priName = "INTERESTING"; break;
+			case IMPORTANT:		priName = "IMPORTANT"; break;
+			case CRITICAL:		priName = "CRITICAL"; break;		
+		}
+		
+		ConColorMsg( Color( 255, 100, 0, 255 ), "%3.2f: %s Look At ( %g, %g, %g ) for %3.2f s, Pri = %s, Reason = %s\n",
+						gpGlobals->curtime,
+						m_player->GetPlayerName(),
+						lookAtPos.x, lookAtPos.y, lookAtPos.z,
+						duration,
+						priName,
+						( reason ) ? reason : "" );	
+	}
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Aim the bot's head towards the given goal
+ */
+void PlayerBody::AimHeadTowards( CBaseEntity *subject, LookAtPriorityType priority, float duration, INextBotReply *replyWhenAimed, const char *reason )
+{
+	if ( duration <= 0.0f )
+	{
+		duration = 0.1f;
+	}
+
+	if ( subject == NULL )
+	{
+		return;
+	}
+
+	// don't spaz our aim around
+	if ( m_lookAtPriority == priority )
+	{
+		if ( !IsHeadSteady() || GetHeadSteadyDuration() < nb_head_aim_settle_duration.GetFloat() )
+		{
+			// we're still finishing a look-at at the same priority
+			if ( replyWhenAimed ) 
+			{
+				replyWhenAimed->OnFail( GetBot(), INextBotReply::DENIED );
+			}
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+			{
+				ConColorMsg( Color( 255, 0, 0, 255 ), "%3.2f: %s Look At '%s' rejected - previous aim not %s\n",
+								gpGlobals->curtime,
+								m_player->GetPlayerName(),
+								reason,
+								IsHeadSteady() ? "head-steady" : "settled long enough" );
+			}
+			return;
+		}
+	}
+
+	// don't short-circuit if "sighted in" to avoid rapid view jitter
+	if ( m_lookAtPriority > priority && !m_lookAtExpireTimer.IsElapsed() )
+	{
+		// higher priority lookat still ongoing
+		if ( replyWhenAimed ) 
+		{
+			replyWhenAimed->OnFail( GetBot(), INextBotReply::DENIED );
+		}
+
+		if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+		{
+			ConColorMsg( Color( 255, 0, 0, 255 ), "%3.2f: %s Look At '%s' rejected - higher priority aim in progress\n",
+							gpGlobals->curtime,
+							m_player->GetPlayerName(),
+							reason );
+		}
+		return;
+	}
+
+	if ( m_lookAtReplyWhenAimed )
+	{
+		// in-process aim was interrupted
+		m_lookAtReplyWhenAimed->OnFail( GetBot(), INextBotReply::INTERRUPTED );
+	}
+
+	m_lookAtReplyWhenAimed = replyWhenAimed;
+	m_lookAtExpireTimer.Start( duration );
+
+	// if given the same subject, just update priority
+	if ( subject == m_lookAtSubject )
+	{
+		m_lookAtPriority = priority;
+		return;
+	}
+
+	// new subject
+	m_lookAtSubject = subject;
+
+#ifdef REFACTOR_FOR_CLIENT_SIDE_EYE_TRACKING
+	CBasePlayer *pMyPlayer = static_cast< CBasePlayer * >( GetEntity() );
+	if ( subject->IsPlayer() )
+	{
+		// looking at a player, look at their eye position
+		TerrorPlayer *pMyTarget = ToTerrorPlayer( subject );
+		m_lookAtPos = subject->EyePosition();
+		if(pMyPlayer)
+		{
+			pMyPlayer->SetLookatPlayer( pMyTarget );
+		}
+	}
+	else
+	{
+		// not looking at a player
+		m_lookAtPos = subject->WorldSpaceCenter();
+		if(pMyPlayer)
+		{
+			pMyPlayer->SetLookatPlayer( NULL );
+		}
+	}
+#endif
+
+	m_lookAtPriority = priority;
+	m_lookAtDurationTimer.Start();
+
+	// do NOT clear this here, or continuous calls to AimHeadTowards will keep IsHeadAimingOnTarget returning false all of the time
+	// m_isSightedIn = false;
+
+	m_hasBeenSightedIn = false;
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOOK_AT ) )
+	{
+		NDebugOverlay::Cross3D( m_lookAtPos, 2.0f, 100, 100, 100, true, duration );
+		
+		const char *priName = "";
+		switch( priority )
+		{
+			case BORING:		priName = "BORING"; break;
+			case INTERESTING:	priName = "INTERESTING"; break;
+			case IMPORTANT:		priName = "IMPORTANT"; break;
+			case CRITICAL:		priName = "CRITICAL"; break;		
+		}
+		
+		ConColorMsg( Color( 255, 100, 0, 255 ), "%3.2f: %s Look At subject %s for %3.2f s, Pri = %s, Reason = %s\n",
+						gpGlobals->curtime,
+						m_player->GetPlayerName(),
+						subject->GetClassname(),
+						duration,
+						priName,
+						( reason ) ? reason : "" );	
+	}
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if head is not rapidly turning to look somewhere else
+ */
+bool PlayerBody::IsHeadSteady( void ) const
+{
+	return m_headSteadyTimer.HasStarted();
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return the duration that the bot's head has been on-target
+ */
+float PlayerBody::GetHeadSteadyDuration( void ) const
+{
+	// return ( IsHeadAimingOnTarget() ) ? m_headSteadyTimer.GetElapsedTime() : 0.0f;
+	return m_headSteadyTimer.HasStarted() ? m_headSteadyTimer.GetElapsedTime() : 0.0f;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+// Clear out currently pending replyWhenAimed callback
+void PlayerBody::ClearPendingAimReply( void )
+{
+	m_lookAtReplyWhenAimed = NULL;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+float PlayerBody::GetMaxHeadAngularVelocity( void ) const
+{
+	return nb_saccade_speed.GetFloat();
+}
+
+
+//-----------------------------------------------------------------------------------------------
+bool PlayerBody::StartActivity( Activity act, unsigned int flags )
+{
+	// player animation state is controlled on the client
+	return false;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return currently animating activity
+ */
+Activity PlayerBody::GetActivity( void ) const
+{
+	return ACT_INVALID;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if currently animating activity matches the given one
+ */
+bool PlayerBody::IsActivity( Activity act ) const
+{
+	return false;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if currently animating activity has any of the given flags
+ */
+bool PlayerBody::HasActivityType( unsigned int flags ) const
+{
+	return false;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Request a posture change
+ */
+void PlayerBody::SetDesiredPosture( PostureType posture )
+{
+	m_posture = posture;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Get posture body is trying to assume
+ */
+IBody::PostureType PlayerBody::GetDesiredPosture( void ) const
+{
+	return m_posture;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if body is trying to assume this posture
+ */
+bool PlayerBody::IsDesiredPosture( PostureType posture ) const
+{
+	return ( posture == m_posture );
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if body's actual posture matches its desired posture
+ */
+bool PlayerBody::IsInDesiredPosture( void ) const
+{
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return body's current actual posture
+ */
+IBody::PostureType PlayerBody::GetActualPosture( void ) const
+{
+	return m_posture;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if body is actually in the given posture
+ */
+bool PlayerBody::IsActualPosture( PostureType posture ) const
+{
+	return ( posture == m_posture );
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if body's current posture allows it to move around the world
+ */
+bool PlayerBody::IsPostureMobile( void ) const
+{
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if body's posture is in the process of changing to new posture
+ */
+bool PlayerBody::IsPostureChanging( void ) const
+{
+	return false;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Arousal level change
+ */
+void PlayerBody::SetArousal( ArousalType arousal )
+{
+	m_arousal = arousal;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Get arousal level
+ */
+IBody::ArousalType PlayerBody::GetArousal( void ) const
+{
+	return m_arousal;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return true if body is at this arousal level
+ */
+bool PlayerBody::IsArousal( ArousalType arousal ) const
+{
+	return ( arousal == m_arousal );
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Width of bot's collision hull in XY plane
+ */
+float PlayerBody::GetHullWidth( void ) const
+{
+	return VEC_HULL_MAX_SCALED( m_player ).x - VEC_HULL_MIN_SCALED( m_player ).x;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Height of bot's current collision hull based on posture
+ */
+float PlayerBody::GetHullHeight( void ) const
+{
+	if ( m_posture == CROUCH )
+	{
+		return GetCrouchHullHeight();
+	}
+
+	return GetStandHullHeight();
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Height of bot's collision hull when standing
+ */
+float PlayerBody::GetStandHullHeight( void ) const
+{
+	return VEC_HULL_MAX_SCALED( m_player ).z - VEC_HULL_MIN_SCALED( m_player ).z;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Height of bot's collision hull when crouched
+ */
+float PlayerBody::GetCrouchHullHeight( void ) const
+{
+	return VEC_DUCK_HULL_MAX_SCALED( m_player ).z - VEC_DUCK_HULL_MIN_SCALED( m_player ).z;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return current collision hull minimums based on actual body posture
+ */
+const Vector &PlayerBody::GetHullMins( void ) const
+{
+	if ( m_posture == CROUCH )
+	{
+		m_hullMins = VEC_DUCK_HULL_MIN_SCALED( m_player );
+	}
+	else
+	{
+		m_hullMins = VEC_HULL_MIN_SCALED( m_player );
+	}
+	
+	return m_hullMins;
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return current collision hull maximums based on actual body posture
+ */
+const Vector &PlayerBody::GetHullMaxs( void ) const
+{
+	if ( m_posture == CROUCH )
+	{
+		m_hullMaxs = VEC_DUCK_HULL_MAX_SCALED( m_player );
+	}
+	else
+	{
+		m_hullMaxs = VEC_HULL_MAX_SCALED( m_player );
+	}
+
+	return m_hullMaxs;	
+}
+
+
+//-----------------------------------------------------------------------------------------------
+/**
+ * Return the bot's collision mask (hack until we get a general hull trace abstraction here or in the locomotion interface)
+ */
+unsigned int PlayerBody::GetSolidMask( void ) const
+{
+	return ( m_player ) ? m_player->PlayerSolidMask() : MASK_PLAYERSOLID;
+}
+
+
+
+
+

game/server/NextBot/Player/NextBotPlayerBody.h

@@ -0,0 +1,153 @@
+// NextBotPlayerBody.h
+// Control and information about the bot's body state (posture, animation state, etc)
+// Author: Michael Booth, October 2006
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_PLAYER_BODY_H_
+#define _NEXT_BOT_PLAYER_BODY_H_
+
+#include "NextBotBodyInterface.h"
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * A useful reply for IBody::AimHeadTowards.  When the
+ * head is aiming on target, press the fire button.
+ */
+class PressFireButtonReply : public INextBotReply
+{
+public:
+	virtual void OnSuccess( INextBot *bot );	// invoked when process completed successfully
+};
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * A useful reply for IBody::AimHeadTowards.  When the
+ * head is aiming on target, press the alt-fire button.
+ */
+class PressAltFireButtonReply : public INextBotReply
+{
+public:
+	virtual void OnSuccess( INextBot *bot );	// invoked when process completed successfully
+};
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * A useful reply for IBody::AimHeadTowards.  When the
+ * head is aiming on target, press the jump button.
+ */
+class PressJumpButtonReply : public INextBotReply
+{
+public:
+	virtual void OnSuccess( INextBot *bot );	// invoked when process completed successfully
+};
+
+
+//----------------------------------------------------------------------------------------------------------------
+/**
+ * The interface for control and information about the bot's body state (posture, animation state, etc)
+ */
+class PlayerBody : public IBody
+{
+public:
+	PlayerBody( INextBot *bot );
+	virtual ~PlayerBody();
+
+	virtual void Reset( void );										// reset to initial state
+	virtual void Upkeep( void );									// lightweight update guaranteed to occur every server tick
+
+	virtual bool SetPosition( const Vector &pos );
+
+	virtual const Vector &GetEyePosition( void ) const;				// return the eye position of the bot in world coordinates
+	virtual const Vector &GetViewVector( void ) const;				// return the view unit direction vector in world coordinates
+
+	virtual void AimHeadTowards( const Vector &lookAtPos, 
+								 LookAtPriorityType priority = BORING, 
+								 float duration = 0.0f,
+								 INextBotReply *replyWhenAimed = NULL,
+								 const char *reason = NULL );		// aim the bot's head towards the given goal
+
+	virtual void AimHeadTowards( CBaseEntity *subject,
+								 LookAtPriorityType priority = BORING, 
+								 float duration = 0.0f,
+								 INextBotReply *replyWhenAimed = NULL,
+								 const char *reason = NULL );		// continually aim the bot's head towards the given subject
+
+	virtual bool IsHeadAimingOnTarget( void ) const;				// return true if the bot's head has achieved its most recent lookat target
+	virtual bool IsHeadSteady( void ) const;						// return true if head is not rapidly turning to look somewhere else
+	virtual float GetHeadSteadyDuration( void ) const;				// return the duration that the bot's head has been on-target
+	virtual void ClearPendingAimReply( void );						// clear out currently pending replyWhenAimed callback
+
+	virtual float GetMaxHeadAngularVelocity( void ) const;			// return max turn rate of head in degrees/second
+
+	virtual bool StartActivity( Activity act, unsigned int flags );
+	virtual Activity GetActivity( void ) const;						// return currently animating activity
+	virtual bool IsActivity( Activity act ) const;					// return true if currently animating activity matches the given one
+	virtual bool HasActivityType( unsigned int flags ) const;		// return true if currently animating activity has any of the given flags
+
+	virtual void SetDesiredPosture( PostureType posture );			// request a posture change
+	virtual PostureType GetDesiredPosture( void ) const;			// get posture body is trying to assume
+	virtual bool IsDesiredPosture( PostureType posture ) const;		// return true if body is trying to assume this posture
+	virtual bool IsInDesiredPosture( void ) const;					// return true if body's actual posture matches its desired posture
+
+	virtual PostureType GetActualPosture( void ) const;				// return body's current actual posture
+	virtual bool IsActualPosture( PostureType posture ) const;		// return true if body is actually in the given posture
+
+	virtual bool IsPostureMobile( void ) const;						// return true if body's current posture allows it to move around the world
+	virtual bool IsPostureChanging( void ) const;					// return true if body's posture is in the process of changing to new posture
+
+	virtual void SetArousal( ArousalType arousal );					// arousal level change
+	virtual ArousalType GetArousal( void ) const;					// get arousal level
+	virtual bool IsArousal( ArousalType arousal ) const;			// return true if body is at this arousal level
+
+	virtual float GetHullWidth( void ) const;						// width of bot's collision hull in XY plane
+	virtual float GetHullHeight( void ) const;						// height of bot's current collision hull based on posture
+	virtual float GetStandHullHeight( void ) const;					// height of bot's collision hull when standing
+	virtual float GetCrouchHullHeight( void ) const;				// height of bot's collision hull when crouched
+	virtual const Vector &GetHullMins( void ) const;				// return current collision hull minimums based on actual body posture
+	virtual const Vector &GetHullMaxs( void ) const;				// return current collision hull maximums based on actual body posture
+
+	virtual unsigned int GetSolidMask( void ) const;				// return the bot's collision mask (hack until we get a general hull trace abstraction here or in the locomotion interface)
+
+	virtual CBaseEntity *GetEntity( void );					// get the entity
+private:
+	CBasePlayer *m_player;
+	
+	PostureType m_posture;
+	ArousalType m_arousal;
+
+	mutable Vector m_eyePos;			// for use with GetEyePosition() ONLY
+	mutable Vector m_viewVector;		// for use with GetViewVector() ONLY
+	mutable Vector m_hullMins;			// for use with GetHullMins() ONLY
+	mutable Vector m_hullMaxs;			// for use with GetHullMaxs() ONLY
+
+	Vector m_lookAtPos;					// if m_lookAtSubject is non-NULL, it continually overwrites this position with its own
+	EHANDLE m_lookAtSubject;
+	Vector m_lookAtVelocity;			// world velocity of lookat point, for tracking moving subjects
+	CountdownTimer m_lookAtTrackingTimer;	
+
+	LookAtPriorityType m_lookAtPriority;
+	CountdownTimer m_lookAtExpireTimer;		// how long until this lookat expired
+	IntervalTimer m_lookAtDurationTimer;	// how long have we been looking at this target
+	INextBotReply *m_lookAtReplyWhenAimed;
+	bool m_isSightedIn;					// true if we are looking at our last lookat target
+	bool m_hasBeenSightedIn;			// true if we have hit the current lookat target
+
+	IntervalTimer m_headSteadyTimer;
+	QAngle m_priorAngles;				// last update's head angles
+	QAngle m_desiredAngles;
+
+	CountdownTimer m_anchorRepositionTimer;	// the time is takes us to recenter our virtual mouse
+	Vector m_anchorForward;
+};
+
+inline bool PlayerBody::IsHeadAimingOnTarget( void ) const
+{
+	// TODO: Calling this immediately after AimHeadTowards will always return false until next Upkeep() (MSB)
+	return m_isSightedIn;
+}
+
+
+#endif // _NEXT_BOT_PLAYER_BODY_H_

game/server/NextBot/Player/NextBotPlayerLocomotion.cpp

@@ -0,0 +1,826 @@
+// NextBotPlayerLocomotion.cpp
+// Implementation of Locomotion interface for CBasePlayer-derived classes
+// Author: Michael Booth, November 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+#include "nav_mesh.h"
+#include "in_buttons.h"
+#include "NextBot.h"
+#include "NextBotUtil.h"
+#include "NextBotPlayer.h"
+#include "NextBotPlayerLocomotion.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+ConVar NextBotPlayerMoveDirect( "nb_player_move_direct", "0" );
+
+//-----------------------------------------------------------------------------------------------------
+PlayerLocomotion::PlayerLocomotion( INextBot *bot ) : ILocomotion( bot )
+{
+	m_player = NULL;
+	Reset();
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+ * Reset locomotor to initial state
+ */
+void PlayerLocomotion::Reset( void )
+{
+	m_player = static_cast< CBasePlayer * >( GetBot()->GetEntity() );
+	
+	m_isJumping = false;
+	m_isClimbingUpToLedge = false;
+	m_isJumpingAcrossGap = false;
+	m_hasLeftTheGround = false;
+	m_desiredSpeed = 0.0f;
+
+
+	m_ladderState = NO_LADDER;
+	m_ladderInfo = NULL;
+	m_ladderDismountGoal = NULL;
+	m_ladderTimer.Invalidate();
+
+	m_minSpeedLimit = 0.0f;
+	m_maxSpeedLimit = 9999999.9f;
+
+	BaseClass::Reset();
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::TraverseLadder( void )
+{
+	switch( m_ladderState )
+	{
+	case APPROACHING_ASCENDING_LADDER:
+		m_ladderState = ApproachAscendingLadder();
+		return true;
+
+	case APPROACHING_DESCENDING_LADDER:
+		m_ladderState = ApproachDescendingLadder();
+		return true;
+
+	case ASCENDING_LADDER:
+		m_ladderState = AscendLadder();
+		return true;
+
+	case DESCENDING_LADDER:
+		m_ladderState = DescendLadder();
+		return true;
+
+	case DISMOUNTING_LADDER_TOP:
+		m_ladderState = DismountLadderTop();
+		return true;
+
+	case DISMOUNTING_LADDER_BOTTOM:
+		m_ladderState = DismountLadderBottom();
+		return true;
+
+	case NO_LADDER:
+	default:
+		m_ladderInfo = NULL;
+
+		if ( GetBot()->GetEntity()->GetMoveType() == MOVETYPE_LADDER )
+		{
+			// on ladder and don't want to be
+			GetBot()->GetEntity()->SetMoveType( MOVETYPE_WALK );
+		}
+		return false;
+	}
+
+	return true;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+ * We're close, but not yet on, this ladder - approach it
+ */
+PlayerLocomotion::LadderState PlayerLocomotion::ApproachAscendingLadder( void )
+{
+	if ( m_ladderInfo == NULL )
+	{
+		return NO_LADDER;
+	}
+
+	// sanity check - are we already at the end of this ladder?
+	if ( GetFeet().z >= m_ladderInfo->m_top.z - GetStepHeight() )
+	{
+		m_ladderTimer.Start( 2.0f );
+		return DISMOUNTING_LADDER_TOP;
+	}
+
+	// sanity check - are we too far below this ladder to reach it?
+	if ( GetFeet().z <= m_ladderInfo->m_bottom.z - GetMaxJumpHeight() )
+	{
+		return NO_LADDER;
+	}
+
+	FaceTowards( m_ladderInfo->m_bottom );
+
+	// it is important to approach precisely, so use a very large weight to wash out all other Approaches
+	Approach( m_ladderInfo->m_bottom, 9999999.9f );
+
+	if ( GetBot()->GetEntity()->GetMoveType() == MOVETYPE_LADDER )
+	{
+		// we're on the ladder
+		return ASCENDING_LADDER;
+	}
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		NDebugOverlay::EntityText( GetBot()->GetEntity()->entindex(), 0, "Approach ascending ladder", 0.1f, 255, 255, 255, 255 );
+	}
+
+	return APPROACHING_ASCENDING_LADDER;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+PlayerLocomotion::LadderState PlayerLocomotion::ApproachDescendingLadder( void )
+{
+	if ( m_ladderInfo == NULL )
+	{
+		return NO_LADDER;
+	}
+
+	// sanity check - are we already at the end of this ladder?
+	if ( GetFeet().z <= m_ladderInfo->m_bottom.z + GetMaxJumpHeight() )
+	{
+		m_ladderTimer.Start( 2.0f );
+		return DISMOUNTING_LADDER_BOTTOM;
+	}
+
+	Vector mountPoint = m_ladderInfo->m_top + 0.25f * GetBot()->GetBodyInterface()->GetHullWidth() * m_ladderInfo->GetNormal();
+	Vector to = mountPoint - GetFeet();
+	to.z = 0.0f;
+
+	float mountRange = to.NormalizeInPlace();
+	Vector moveGoal;
+
+	const float veryClose = 10.0f;
+	if ( mountRange < veryClose )
+	{
+		// we're right at the ladder - just keep moving forward until we grab it
+		const Vector &forward = GetMotionVector();
+		moveGoal = GetFeet() + 100.0f * forward;
+	}
+	else
+	{
+		if ( DotProduct( to, m_ladderInfo->GetNormal() ) < 0.0f )
+		{
+			// approaching front of downward ladder
+			//     ##
+			// ->+ ##
+			//   | ##
+			//   | ##
+			//   | ##
+			// <-+ ##
+			// ######
+			//
+			moveGoal = m_ladderInfo->m_top - 100.0f * m_ladderInfo->GetNormal();
+		}
+		else
+		{
+			// approaching back of downward ladder
+			//
+			// ->+
+			// ##|
+			// ##|
+			// ##+-->
+			// ######
+			//
+			moveGoal = m_ladderInfo->m_top + 100.0f * m_ladderInfo->GetNormal();
+		}
+	}
+
+	FaceTowards( moveGoal );
+
+	// it is important to approach precisely, so use a very large weight to wash out all other Approaches
+	Approach( moveGoal, 9999999.9f );
+
+	if ( GetBot()->GetEntity()->GetMoveType() == MOVETYPE_LADDER )
+	{
+		// we're on the ladder
+		return DESCENDING_LADDER;
+	}
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		NDebugOverlay::EntityText( GetBot()->GetEntity()->entindex(), 0, "Approach descending ladder", 0.1f, 255, 255, 255, 255 );
+	}
+
+	return APPROACHING_DESCENDING_LADDER;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+PlayerLocomotion::LadderState PlayerLocomotion::AscendLadder( void )
+{
+	if ( m_ladderInfo == NULL )
+	{
+		return NO_LADDER;
+	}
+
+	if ( GetBot()->GetEntity()->GetMoveType() != MOVETYPE_LADDER )
+	{
+		// slipped off ladder
+		m_ladderInfo = NULL;
+		return NO_LADDER;
+	}
+
+	if ( GetFeet().z >= m_ladderInfo->m_top.z )
+	{
+		// reached top of ladder
+		m_ladderTimer.Start( 2.0f );
+		return DISMOUNTING_LADDER_TOP;
+	}
+
+	// climb up this ladder - look up
+	Vector goal = GetFeet() + 100.0f * ( -m_ladderInfo->GetNormal() + Vector( 0, 0, 2 ) );
+
+	GetBot()->GetBodyInterface()->AimHeadTowards( goal, IBody::MANDATORY, 0.1f, NULL, "Ladder" );
+
+	// it is important to approach precisely, so use a very large weight to wash out all other Approaches
+	Approach( goal, 9999999.9f );
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		NDebugOverlay::EntityText( GetBot()->GetEntity()->entindex(), 0, "Ascend", 0.1f, 255, 255, 255, 255 );
+	}
+
+	return ASCENDING_LADDER;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+PlayerLocomotion::LadderState PlayerLocomotion::DescendLadder( void )
+{
+	if ( m_ladderInfo == NULL )
+	{
+		return NO_LADDER;
+	}
+
+	if ( GetBot()->GetEntity()->GetMoveType() != MOVETYPE_LADDER )
+	{
+		// slipped off ladder
+		m_ladderInfo = NULL;
+		return NO_LADDER;
+	}
+
+	if ( GetFeet().z <= m_ladderInfo->m_bottom.z + GetBot()->GetLocomotionInterface()->GetStepHeight() )
+	{
+		// reached bottom of ladder
+		m_ladderTimer.Start( 2.0f );
+		return DISMOUNTING_LADDER_BOTTOM;
+	}
+
+	// climb down this ladder - look down 
+	Vector goal = GetFeet() + 100.0f * ( m_ladderInfo->GetNormal() + Vector( 0, 0, -2 ) );
+
+	GetBot()->GetBodyInterface()->AimHeadTowards( goal, IBody::MANDATORY, 0.1f, NULL, "Ladder" );
+
+	// it is important to approach precisely, so use a very large weight to wash out all other Approaches
+	Approach( goal, 9999999.9f );
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		NDebugOverlay::EntityText( GetBot()->GetEntity()->entindex(), 0, "Descend", 0.1f, 255, 255, 255, 255 );
+	}
+
+	return DESCENDING_LADDER;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+PlayerLocomotion::LadderState PlayerLocomotion::DismountLadderTop( void )
+{
+	if ( m_ladderInfo == NULL || m_ladderTimer.IsElapsed() )
+	{
+		m_ladderInfo = NULL;
+		return NO_LADDER;
+	}
+
+	IBody *body = GetBot()->GetBodyInterface();
+	Vector toGoal = m_ladderDismountGoal->GetCenter() - GetFeet();
+	toGoal.z = 0.0f;
+	float range = toGoal.NormalizeInPlace();
+	toGoal.z = 1.0f;
+	
+	body->AimHeadTowards( body->GetEyePosition() + 100.0f * toGoal, IBody::MANDATORY, 0.1f, NULL, "Ladder dismount" );
+
+	// it is important to approach precisely, so use a very large weight to wash out all other Approaches
+	Approach( GetFeet() + 100.0f * toGoal, 9999999.9f );
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		NDebugOverlay::EntityText( GetBot()->GetEntity()->entindex(), 0, "Dismount top", 0.1f, 255, 255, 255, 255 );
+		NDebugOverlay::HorzArrow( GetFeet(), m_ladderDismountGoal->GetCenter(), 5.0f, 255, 255, 0, 255, true, 0.1f );
+	}
+
+	// test 2D vector here in case nav area is under the geometry a bit
+	const float tolerance = 10.0f;
+	if ( GetBot()->GetEntity()->GetLastKnownArea() == m_ladderDismountGoal && range < tolerance )
+	{
+		// reached dismount goal
+		m_ladderInfo = NULL;
+		return NO_LADDER;
+	}
+
+	return DISMOUNTING_LADDER_TOP;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+PlayerLocomotion::LadderState PlayerLocomotion::DismountLadderBottom( void )
+{
+	if ( m_ladderInfo == NULL || m_ladderTimer.IsElapsed() )
+	{
+		m_ladderInfo = NULL;
+		return NO_LADDER;
+	}
+
+	if ( GetBot()->GetEntity()->GetMoveType() == MOVETYPE_LADDER )
+	{
+		// near the bottom - just let go
+		GetBot()->GetEntity()->SetMoveType( MOVETYPE_WALK );
+		m_ladderInfo = NULL;
+	}
+
+	return NO_LADDER;
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+ * Update internal state
+ */
+void PlayerLocomotion::Update( void )
+{
+	if ( TraverseLadder() )
+	{
+		return BaseClass::Update();
+	}
+
+	if ( m_isJumpingAcrossGap || m_isClimbingUpToLedge )
+	{
+		// force a run
+		SetMinimumSpeedLimit( GetRunSpeed() );
+
+		Vector toLanding = m_landingGoal - GetFeet();
+		toLanding.z = 0.0f;
+		toLanding.NormalizeInPlace();
+
+		if ( m_hasLeftTheGround )
+		{
+			// face into the jump/climb
+			GetBot()->GetBodyInterface()->AimHeadTowards( GetBot()->GetEntity()->EyePosition() + 100.0 * toLanding, IBody::MANDATORY, 0.25f, NULL, "Facing impending jump/climb" );
+
+			if ( IsOnGround() )
+			{
+				// back on the ground - jump is complete
+				m_isClimbingUpToLedge = false;
+				m_isJumpingAcrossGap = false;
+				SetMinimumSpeedLimit( 0.0f );
+			}
+		}
+		else
+		{
+			// haven't left the ground yet - just starting the jump
+
+			if ( !IsClimbingOrJumping() )
+			{
+				Jump();
+			}
+
+			Vector vel = GetBot()->GetEntity()->GetAbsVelocity();
+
+			if ( m_isJumpingAcrossGap )
+			{
+				// cheat and max our velocity in case we were stopped at the edge of this gap
+				vel.x = GetRunSpeed() * toLanding.x;
+				vel.y = GetRunSpeed() * toLanding.y;
+				// leave vel.z unchanged
+			}
+
+			GetBot()->GetEntity()->SetAbsVelocity( vel );
+
+			if ( !IsOnGround() )
+			{
+				// jump has begun
+				m_hasLeftTheGround = true;
+			}
+		}
+
+		
+		Approach( m_landingGoal );
+	}
+
+	BaseClass::Update();
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+void PlayerLocomotion::AdjustPosture( const Vector &moveGoal )
+{
+	// This function has no effect if we're not standing or crouching
+	IBody *body = GetBot()->GetBodyInterface();
+	if ( !body->IsActualPosture( IBody::STAND ) && !body->IsActualPosture( IBody::CROUCH ) )
+		return;
+
+	// not all games have auto-crouch, so don't assume it here
+	BaseClass::AdjustPosture( moveGoal );
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+ * Build a user command to move this player towards the goal position
+ */
+void PlayerLocomotion::Approach( const Vector &pos, float goalWeight )
+{
+	VPROF_BUDGET( "PlayerLocomotion::Approach", "NextBot" );
+
+	BaseClass::Approach( pos );
+
+	AdjustPosture( pos );
+
+	if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+	{
+		NDebugOverlay::Line( GetFeet(), pos, 255, 255, 0, true, 0.1f );
+	}
+
+	INextBotPlayerInput *playerButtons = dynamic_cast< INextBotPlayerInput * >( GetBot() );
+
+	if ( !playerButtons )
+	{
+		DevMsg( "PlayerLocomotion::Approach: No INextBotPlayerInput\n " );
+		return;
+	}
+
+	Vector forward3D;
+	m_player->EyeVectors( &forward3D );
+	
+	Vector2D forward( forward3D.x, forward3D.y );
+	forward.NormalizeInPlace();
+		
+	Vector2D right( forward.y, -forward.x );
+
+	// compute unit vector to goal position
+	Vector2D to = ( pos - GetFeet() ).AsVector2D();
+	float goalDistance = to.NormalizeInPlace();
+
+	float ahead = to.Dot( forward );
+	float side = to.Dot( right );
+
+#ifdef NEED_TO_INTEGRATE_MOTION_CONTROLLED_CODE_FROM_L4D_PLAYERS
+	// If we're climbing ledges, we need to stay crouched to prevent player movement code from messing
+	// with our origin.
+	CTerrorPlayer *player = ToTerrorPlayer(m_player);
+	if ( player && player->IsMotionControlledZ( player->GetMainActivity() ) )
+	{
+		playerButtons->PressCrouchButton();
+		return;
+	}
+#endif
+
+	if ( m_player->IsOnLadder() && IsUsingLadder() && ( m_ladderState == ASCENDING_LADDER || m_ladderState == DESCENDING_LADDER ) )
+	{
+		// we are on a ladder and WANT to be on a ladder.
+		playerButtons->PressForwardButton();
+
+		// Stay in center of ladder.  The gamemovement will autocenter us in most cases, but this is needed in case it doesn't.
+		if ( m_ladderInfo )
+		{
+			Vector posOnLadder;
+			CalcClosestPointOnLine( GetFeet(), m_ladderInfo->m_bottom, m_ladderInfo->m_top, posOnLadder );
+
+			Vector alongLadder = m_ladderInfo->m_top - m_ladderInfo->m_bottom;
+			alongLadder.NormalizeInPlace();
+
+			Vector rightLadder = CrossProduct( alongLadder, m_ladderInfo->GetNormal() );
+
+			Vector away = GetFeet() - posOnLadder;
+
+			// we only want error in plane of ladder
+			float error = DotProduct( away, rightLadder );
+			away.NormalizeInPlace();
+
+			const float tolerance = 5.0f + 0.25f * GetBot()->GetBodyInterface()->GetHullWidth();
+			if ( error > tolerance )
+			{
+				if ( DotProduct( away, rightLadder ) > 0.0f )
+				{
+					playerButtons->PressLeftButton();
+				}
+				else
+				{
+					playerButtons->PressRightButton();
+				}
+			}
+		}
+	}
+	else
+	{
+		const float epsilon = 0.25f;
+		if ( NextBotPlayerMoveDirect.GetBool() )
+		{
+			if ( goalDistance > epsilon )
+			{
+				playerButtons->SetButtonScale( ahead, side );
+			}
+		}
+
+		if ( ahead > epsilon )
+		{
+			playerButtons->PressForwardButton();
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+			{
+				NDebugOverlay::HorzArrow( m_player->GetAbsOrigin(), m_player->GetAbsOrigin() + 50.0f * Vector( forward.x, forward.y, 0.0f ), 15.0f, 0, 255, 0, 255, true, 0.1f );
+			}
+		}
+		else if ( ahead < -epsilon )
+		{
+			playerButtons->PressBackwardButton();
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+			{
+				NDebugOverlay::HorzArrow( m_player->GetAbsOrigin(), m_player->GetAbsOrigin() - 50.0f * Vector( forward.x, forward.y, 0.0f ), 15.0f, 255, 0, 0, 255, true, 0.1f );
+			}
+		}
+
+		if ( side <= -epsilon )
+		{
+			playerButtons->PressLeftButton();
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+			{
+				NDebugOverlay::HorzArrow( m_player->GetAbsOrigin(), m_player->GetAbsOrigin() - 50.0f * Vector( right.x, right.y, 0.0f ), 15.0f, 255, 0, 255, 255, true, 0.1f );
+			}
+		}
+		else if ( side >= epsilon )
+		{
+			playerButtons->PressRightButton();
+
+			if ( GetBot()->IsDebugging( NEXTBOT_LOCOMOTION ) )
+			{
+				NDebugOverlay::HorzArrow( m_player->GetAbsOrigin(), m_player->GetAbsOrigin() + 50.0f * Vector( right.x, right.y, 0.0f ), 15.0f, 0, 255, 255, 255, true, 0.1f );
+			}
+		}
+	}
+
+	if ( !IsRunning() )
+	{
+		playerButtons->PressWalkButton();
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Move the bot to the precise given position immediately, 
+ */
+void PlayerLocomotion::DriveTo( const Vector &pos )
+{
+	BaseClass::DriveTo( pos );
+
+	Approach( pos );
+}
+
+
+//----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::IsClimbPossible( INextBot *me, const CBaseEntity *obstacle ) const
+{
+	// don't jump unless we have to
+	const PathFollower *path = GetBot()->GetCurrentPath();
+	if ( path )
+	{
+		const float watchForClimbRange = 75.0f;
+		if ( !path->IsDiscontinuityAhead( GetBot(), Path::CLIMB_UP, watchForClimbRange ) )
+		{
+			// we are not planning on climbing
+
+			// always allow climbing over movable obstacles
+			if ( obstacle && !const_cast< CBaseEntity * >( obstacle )->IsWorld() )
+			{
+				IPhysicsObject *physics = obstacle->VPhysicsGetObject();
+				if ( physics && physics->IsMoveable() )
+				{
+					// movable physics object - climb over it
+					return true;
+				}
+			}
+
+			if ( !GetBot()->GetLocomotionInterface()->IsStuck() )
+			{
+				// we're not stuck - don't try to jump up yet
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::ClimbUpToLedge( const Vector &landingGoal, const Vector &landingForward, const CBaseEntity *obstacle )
+{
+	if ( !IsClimbPossible( GetBot(), obstacle ) )
+	{
+		return false;
+	}
+
+	Jump();
+
+	m_isClimbingUpToLedge = true;
+	m_landingGoal = landingGoal;
+	m_hasLeftTheGround = false;
+
+	return true;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+void PlayerLocomotion::JumpAcrossGap( const Vector &landingGoal, const Vector &landingForward )
+{
+	Jump();
+
+	// face forward
+	GetBot()->GetBodyInterface()->AimHeadTowards( landingGoal, IBody::MANDATORY, 1.0f, NULL, "Looking forward while jumping a gap" );
+
+	m_isJumpingAcrossGap = true;
+	m_landingGoal = landingGoal;
+	m_hasLeftTheGround = false;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+void PlayerLocomotion::Jump( void )
+{
+	m_isJumping = true;
+	m_jumpTimer.Start( 0.5f );
+
+	INextBotPlayerInput *playerButtons = dynamic_cast< INextBotPlayerInput * >( GetBot() );
+	if ( playerButtons )
+	{
+		playerButtons->PressJumpButton();
+	}
+}
+
+
+//----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::IsClimbingOrJumping( void ) const
+{
+	if ( !m_isJumping )
+		return false;
+		
+	if ( m_jumpTimer.IsElapsed() && IsOnGround() )
+	{
+		m_isJumping = false;
+		return false;
+	}
+	
+	return true;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::IsClimbingUpToLedge( void ) const
+{
+	return m_isClimbingUpToLedge;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::IsJumpingAcrossGap( void ) const
+{
+	return m_isJumpingAcrossGap;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Return true if standing on something
+ */
+bool PlayerLocomotion::IsOnGround( void ) const
+{
+	return (m_player->GetGroundEntity() != NULL);
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Return the current ground entity or NULL if not on the ground
+ */
+CBaseEntity *PlayerLocomotion::GetGround( void ) const
+{
+	return m_player->GetGroundEntity();
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Surface normal of the ground we are in contact with
+ */
+const Vector &PlayerLocomotion::GetGroundNormal( void ) const
+{
+	static Vector up( 0, 0, 1.0f );
+	return up;
+
+	// TODO: Integrate movehelper_server for this:  return m_player->GetGroundNormal();
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Climb the given ladder to the top and dismount
+ */
+void PlayerLocomotion::ClimbLadder( const CNavLadder *ladder, const CNavArea *dismountGoal )
+{
+	// look up and push forward
+// 	Vector goal =  GetBot()->GetPosition() + 100.0f * ( Vector( 0, 0, 1.0f ) - ladder->GetNormal() );
+// 	Approach( goal );
+// 	FaceTowards( goal );
+	
+	m_ladderState = APPROACHING_ASCENDING_LADDER;
+	m_ladderInfo = ladder;
+	m_ladderDismountGoal = dismountGoal;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Descend the given ladder to the bottom and dismount
+ */
+void PlayerLocomotion::DescendLadder( const CNavLadder *ladder, const CNavArea *dismountGoal )
+{
+	// look down and push forward
+// 	Vector goal =  GetBot()->GetPosition() + 100.0f * ( Vector( 0, 0, -1.0f ) - ladder->GetNormal() );
+// 	Approach( goal );
+// 	FaceTowards( goal );
+
+	m_ladderState = APPROACHING_DESCENDING_LADDER;
+	m_ladderInfo = ladder;
+	m_ladderDismountGoal = dismountGoal;
+}
+
+
+//----------------------------------------------------------------------------------------------------
+bool PlayerLocomotion::IsUsingLadder( void ) const
+{
+	return ( m_ladderState != NO_LADDER );
+}
+
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * Rotate body to face towards "target"
+ */
+void PlayerLocomotion::FaceTowards( const Vector &target )
+{
+	// player body follows view direction
+	Vector look( target.x, target.y, GetBot()->GetEntity()->EyePosition().z );
+
+	GetBot()->GetBodyInterface()->AimHeadTowards( look, IBody::BORING, 0.1f, NULL, "Body facing" );
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+* Return position of "feet" - point below centroid of bot at feet level
+*/
+const Vector &PlayerLocomotion::GetFeet( void ) const
+{
+	return m_player->GetAbsOrigin();
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+ * Return current world space velocity
+ */
+const Vector &PlayerLocomotion::GetVelocity( void ) const
+{
+	return m_player->GetAbsVelocity();
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+float PlayerLocomotion::GetRunSpeed( void ) const
+{
+	return m_player->MaxSpeed();
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+float PlayerLocomotion::GetWalkSpeed( void ) const
+{
+	return 0.5f * m_player->MaxSpeed();
+}
+

game/server/NextBot/Player/NextBotPlayerLocomotion.h

@@ -0,0 +1,223 @@
+// NextBotPlayerLocomotion.h
+// Locomotor for CBasePlayer derived bots
+// Author: Michael Booth, November 2005
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#ifndef _NEXT_BOT_PLAYER_LOCOMOTION_H_
+#define _NEXT_BOT_PLAYER_LOCOMOTION_H_
+
+#include "NextBot.h"
+#include "NextBotLocomotionInterface.h"
+#include "Path/NextBotPathFollow.h"
+
+class CBasePlayer;
+
+//--------------------------------------------------------------------------------------------------
+/**
+ * Basic player locomotion implementation
+ */
+class PlayerLocomotion : public ILocomotion
+{
+public:
+	DECLARE_CLASS( PlayerLocomotion, ILocomotion );
+
+	PlayerLocomotion( INextBot *bot );
+	virtual ~PlayerLocomotion() { }
+
+	virtual void Reset( void );							// reset to initial state
+	virtual void Update( void );						// update internal state
+
+	virtual void Approach( const Vector &pos, float goalWeight = 1.0f );	// move directly towards the given position
+	virtual void DriveTo( const Vector &pos );			// Move the bot to the precise given position immediately, 
+
+	//
+	// ILocomotion modifiers
+	//
+	virtual bool ClimbUpToLedge( const Vector &landingGoal, const Vector &landingForward, const CBaseEntity *obstacle );	// initiate a jump to an adjacent high ledge, return false if climb can't start
+	virtual void JumpAcrossGap( const Vector &landingGoal, const Vector &landingForward );	// initiate a jump across an empty volume of space to far side
+	virtual void Jump( void );								// initiate a simple undirected jump in the air
+	virtual bool IsClimbingOrJumping( void ) const;					// is jumping in any form
+	virtual bool IsClimbingUpToLedge( void ) const;			// is climbing up to a high ledge
+	virtual bool IsJumpingAcrossGap( void ) const;			// is jumping across a gap to the far side
+
+	virtual void Run( void );								// set desired movement speed to running
+	virtual void Walk( void );								// set desired movement speed to walking
+	virtual void Stop( void );								// set desired movement speed to stopped
+	virtual bool IsRunning( void ) const;
+	virtual void SetDesiredSpeed( float speed );			// set desired speed for locomotor movement
+	virtual float GetDesiredSpeed( void ) const;			// returns the current desired speed
+	virtual void SetMinimumSpeedLimit( float limit );		// speed cannot drop below this 
+	virtual void SetMaximumSpeedLimit( float limit );		// speed cannot rise above this 
+
+	virtual bool IsOnGround( void ) const;					// return true if standing on something
+	virtual CBaseEntity *GetGround( void ) const;			// return the current ground entity or NULL if not on the ground
+	virtual const Vector &GetGroundNormal( void ) const;	// surface normal of the ground we are in contact with
+
+	virtual void ClimbLadder( const CNavLadder *ladder, const CNavArea *dismountGoal );		// climb the given ladder to the top and dismount
+	virtual void DescendLadder( const CNavLadder *ladder, const CNavArea *dismountGoal );		// descend the given ladder to the bottom and dismount
+	virtual bool IsUsingLadder( void ) const;
+	virtual bool IsAscendingOrDescendingLadder( void ) const;	// we are actually on the ladder right now, either climbing up or down
+	virtual bool IsAbleToAutoCenterOnLadder( void ) const;
+
+	virtual void FaceTowards( const Vector &target );		// rotate body to face towards "target"
+
+	virtual void SetDesiredLean( const QAngle &lean )	{ }
+	virtual const QAngle &GetDesiredLean( void ) const	{ static QAngle junk; return junk; }
+
+	//
+	// ILocomotion information
+	//
+	virtual const Vector &GetFeet( void ) const;			// return position of "feet" - point below centroid of bot at feet level
+
+	virtual float GetStepHeight( void ) const;				// if delta Z is greater than this, we have to jump to get up
+	virtual float GetMaxJumpHeight( void ) const;			// return maximum height of a jump
+	virtual float GetDeathDropHeight( void ) const;			// distance at which we will die if we fall
+
+	virtual float GetRunSpeed( void ) const;				// get maximum running speed
+	virtual float GetWalkSpeed( void ) const;				// get maximum walking speed
+
+	virtual float GetMaxAcceleration( void ) const;			// return maximum acceleration of locomotor
+	virtual float GetMaxDeceleration( void ) const;			// return maximum deceleration of locomotor
+
+	virtual const Vector &GetVelocity( void ) const;		// return current world space velocity
+
+protected:
+	virtual void AdjustPosture( const Vector &moveGoal );
+
+private:
+	CBasePlayer *m_player;									// the player we are locomoting	
+
+	mutable bool m_isJumping;
+	CountdownTimer m_jumpTimer;
+
+	bool m_isClimbingUpToLedge;
+	bool m_isJumpingAcrossGap;
+	Vector m_landingGoal;
+	bool m_hasLeftTheGround;
+
+	float m_desiredSpeed;
+	float m_minSpeedLimit;
+	float m_maxSpeedLimit;
+
+	bool TraverseLadder( void );			// when climbing/descending a ladder
+
+	enum LadderState
+	{
+		NO_LADDER,							// not using a ladder
+		APPROACHING_ASCENDING_LADDER,
+		APPROACHING_DESCENDING_LADDER,
+		ASCENDING_LADDER,
+		DESCENDING_LADDER,
+		DISMOUNTING_LADDER_TOP,
+		DISMOUNTING_LADDER_BOTTOM,
+	};
+
+	LadderState m_ladderState;
+	LadderState ApproachAscendingLadder( void );
+	LadderState ApproachDescendingLadder( void );
+	LadderState AscendLadder( void );
+	LadderState DescendLadder( void );
+	LadderState DismountLadderTop( void );
+	LadderState DismountLadderBottom( void );
+	
+	const CNavLadder *m_ladderInfo;
+	const CNavArea *m_ladderDismountGoal;
+	CountdownTimer m_ladderTimer;			// a "give up" timer if things go awry
+
+	bool IsClimbPossible( INextBot *me, const CBaseEntity *obstacle ) const;
+};
+
+
+inline float PlayerLocomotion::GetStepHeight( void ) const
+{
+	return 18.0f;
+}
+
+
+inline float PlayerLocomotion::GetMaxJumpHeight( void ) const
+{
+	return 57.0f;
+}
+
+
+inline float PlayerLocomotion::GetDeathDropHeight( void ) const
+{
+	return 200.0f;
+}
+
+
+inline float PlayerLocomotion::GetMaxAcceleration( void ) const
+{
+	return 100.0f;
+}
+
+inline float PlayerLocomotion::GetMaxDeceleration( void ) const
+{
+	return 200.0f;
+}
+
+inline void PlayerLocomotion::Run( void )
+{
+	m_desiredSpeed = GetRunSpeed();
+}
+
+inline void PlayerLocomotion::Walk( void )
+{
+	m_desiredSpeed = GetWalkSpeed();
+}
+
+inline void PlayerLocomotion::Stop( void )
+{
+	m_desiredSpeed = 0.0f;
+}
+
+inline bool PlayerLocomotion::IsRunning( void ) const
+{
+	return true;
+}
+
+inline void PlayerLocomotion::SetDesiredSpeed( float speed )
+{
+	m_desiredSpeed = speed;
+}
+
+inline float PlayerLocomotion::GetDesiredSpeed( void ) const
+{
+	return clamp( m_desiredSpeed, m_minSpeedLimit, m_maxSpeedLimit );
+}
+
+inline void PlayerLocomotion::SetMinimumSpeedLimit( float limit )
+{
+	m_minSpeedLimit = limit;
+}
+
+inline void PlayerLocomotion::SetMaximumSpeedLimit( float limit )
+{
+	m_maxSpeedLimit = limit;
+}
+
+inline bool PlayerLocomotion::IsAbleToAutoCenterOnLadder( void ) const
+{
+	return IsUsingLadder() && (m_ladderState == ASCENDING_LADDER || m_ladderState == DESCENDING_LADDER);
+}
+
+inline bool PlayerLocomotion::IsAscendingOrDescendingLadder( void ) const
+{
+	switch( m_ladderState )
+	{
+	case ASCENDING_LADDER:
+	case DESCENDING_LADDER:
+	case DISMOUNTING_LADDER_TOP:
+	case DISMOUNTING_LADDER_BOTTOM:
+		return true;
+	default:
+		// Explicitly handle the default so that clang knows not to warn us.
+		// warning: enumeration values 'NO_LADDER', 'APPROACHING_ASCENDING_LADDER', and 'APPROACHING_DESCENDING_LADDER' not handled in switch [-Wswitch-enum]
+		break;
+	}
+
+	return false;
+}
+
+
+#endif // _NEXT_BOT_PLAYER_LOCOMOTION_H_

game/server/NextBot/simple_bot.cpp

@@ -0,0 +1,199 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+// simple_bot.cpp
+// A simple bot
+// Michael Booth, February 2009
+
+#include "cbase.h"
+#include "simple_bot.h"
+#include "nav_mesh.h"
+
+
+//-----------------------------------------------------------------------------------------------------
+// Command to add a Simple Bot where your crosshairs are aiming
+//-----------------------------------------------------------------------------------------------------
+CON_COMMAND_F( simple_bot_add, "Add a simple bot.", FCVAR_CHEAT )
+{
+	CBasePlayer *player = UTIL_GetCommandClient();
+	if ( !player )
+	{
+		return;
+	}
+
+	Vector forward;
+	player->EyeVectors( &forward );
+
+	trace_t result;
+	UTIL_TraceLine( player->EyePosition(), player->EyePosition() + 999999.9f * forward, MASK_BLOCKLOS_AND_NPCS|CONTENTS_IGNORE_NODRAW_OPAQUE, player, COLLISION_GROUP_NONE, &result );
+	if ( !result.DidHit() )
+	{
+		return;
+	}
+
+	CSimpleBot *bot = static_cast< CSimpleBot * >( CreateEntityByName( "simple_bot" ) );
+	if ( bot )
+	{
+		Vector forward = player->GetAbsOrigin() - result.endpos;
+		forward.z = 0.0f;
+		forward.NormalizeInPlace();
+
+		QAngle angles;
+		VectorAngles( forward, angles );
+
+		bot->SetAbsAngles( angles );
+		bot->SetAbsOrigin( result.endpos + Vector( 0, 0, 10.0f ) );
+
+		DispatchSpawn( bot );
+	}
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+// The Simple Bot
+//-----------------------------------------------------------------------------------------------------
+LINK_ENTITY_TO_CLASS( simple_bot, CSimpleBot );
+
+#ifndef TF_DLL
+PRECACHE_REGISTER( simple_bot );
+#endif
+
+
+//-----------------------------------------------------------------------------------------------------
+CSimpleBot::CSimpleBot()
+{
+	ALLOCATE_INTENTION_INTERFACE( CSimpleBot );
+
+	m_locomotor = new NextBotGroundLocomotion( this );
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+CSimpleBot::~CSimpleBot()
+{
+	DEALLOCATE_INTENTION_INTERFACE;
+
+	if ( m_locomotor )
+		delete m_locomotor;
+}
+
+//-----------------------------------------------------------------------------------------------------
+void CSimpleBot::Precache()
+{
+	BaseClass::Precache();
+
+#ifndef DOTA_DLL
+	PrecacheModel( "models/humans/group01/female_01.mdl" );
+#endif
+}
+
+
+//-----------------------------------------------------------------------------------------------------
+void CSimpleBot::Spawn( void )
+{
+	BaseClass::Spawn();
+
+#ifndef DOTA_DLL
+	SetModel( "models/humans/group01/female_01.mdl" );
+#endif
+}
+
+
+//---------------------------------------------------------------------------------------------
+// The Simple Bot behaviors
+//---------------------------------------------------------------------------------------------
+/**
+ * For use with TheNavMesh->ForAllAreas()
+ * Find the Nth area in the sequence
+ */
+class SelectNthAreaFunctor
+{
+public:
+	SelectNthAreaFunctor( int count )
+	{
+		m_count = count;
+		m_area = NULL;
+	}
+
+	bool operator() ( CNavArea *area )
+	{
+		m_area = area;
+		return ( m_count-- > 0 );
+	}
+
+	int m_count;
+	CNavArea *m_area;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * This action causes the bot to pick a random nav area in the mesh and move to it, then
+ * pick another, etc.
+ * Actions usually each have their own .cpp/.h file and are organized into folders since there
+ * are often many of them. For this example, we're keeping everything to a single .cpp/.h file.
+ */
+class CSimpleBotRoam : public Action< CSimpleBot >
+{
+public:
+	//----------------------------------------------------------------------------------
+	// OnStart is called once when the Action first becomes active
+	virtual ActionResult< CSimpleBot >	OnStart( CSimpleBot *me, Action< CSimpleBot > *priorAction )
+	{
+		// smooth out the bot's path following by moving toward a point farther down the path
+		m_path.SetMinLookAheadDistance( 300.0f );
+
+		return Continue();
+	}
+
+
+	//----------------------------------------------------------------------------------
+	// Update is called repeatedly (usually once per server frame) while the Action is active
+	virtual ActionResult< CSimpleBot >	Update( CSimpleBot *me, float interval )
+	{
+		if ( m_path.IsValid() && !m_timer.IsElapsed() ) 
+		{
+			// PathFollower::Update() moves the bot along the path using the bot's ILocomotion and IBody interfaces
+			m_path.Update( me );
+		}
+		else
+		{
+			SelectNthAreaFunctor pick( RandomInt( 0, TheNavMesh->GetNavAreaCount() - 1 ) );
+			TheNavMesh->ForAllAreas( pick );
+
+			if ( pick.m_area )
+			{
+				CSimpleBotPathCost cost( me );
+				m_path.Compute( me, pick.m_area->GetCenter(), cost );
+			}
+
+			// follow this path for a random duration (or until we reach the end)
+			m_timer.Start( RandomFloat( 5.0f, 10.0f ) );
+		}
+
+		return Continue();
+	}
+
+
+	//----------------------------------------------------------------------------------
+	// this is an event handler - many more are available (see declaration of Action< Actor > in NextBotBehavior.h)
+	virtual EventDesiredResult< CSimpleBot > OnStuck( CSimpleBot *me )
+	{
+		// we are stuck trying to follow the current path - invalidate it so a new one is chosen
+		m_path.Invalidate();
+
+		return TryContinue();
+	}
+
+
+	virtual const char *GetName( void ) const	{ return "Roam"; }		// return name of this action
+
+private:
+	PathFollower m_path;
+	CountdownTimer m_timer;
+};
+
+
+//---------------------------------------------------------------------------------------------
+/**
+ * Instantiate the bot's Intention interface and start the initial Action (CSimpleBotRoam in this case)
+ */
+IMPLEMENT_INTENTION_INTERFACE( CSimpleBot, CSimpleBotRoam )

game/server/NextBot/simple_bot.h

@@ -0,0 +1,116 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+// simple_bot.h
+// A mininal example of a NextBotCombatCharacter (ie: non-player) bot
+// Michael Booth, February 2009
+
+#ifndef SIMPLE_BOT_H
+#define SIMPLE_BOT_H
+
+#include "NextBot.h"
+#include "NextBotBehavior.h"
+#include "NextBotGroundLocomotion.h"
+#include "Path/NextBotPathFollow.h"
+
+
+//----------------------------------------------------------------------------
+/**
+ * A Simple Bot
+ */
+class CSimpleBot : public NextBotCombatCharacter
+{
+public:
+	DECLARE_CLASS( CSimpleBot, NextBotCombatCharacter );
+
+	CSimpleBot();
+	virtual ~CSimpleBot();
+
+	virtual void Precache();
+	virtual void Spawn( void );
+
+	// INextBot
+	DECLARE_INTENTION_INTERFACE( CSimpleBot )
+	virtual NextBotGroundLocomotion	*GetLocomotionInterface( void ) const	{ return m_locomotor; }
+
+private:
+	NextBotGroundLocomotion	*m_locomotor;
+};
+
+
+//--------------------------------------------------------------------------------------------------------------
+/**
+ * Functor used with the A* algorithm of NavAreaBuildPath() to determine the "cost" of moving from one area to another.
+ * "Cost" is generally the weighted distance between the centers of the areas. If you want the bot
+ * to avoid an area/ladder/elevator, increase the cost.  If you want to disallow an area/ladder/elevator, return -1.
+ */
+class CSimpleBotPathCost : public IPathCost
+{
+public:
+	CSimpleBotPathCost( CSimpleBot *me )
+	{
+		m_me = me;
+	}
+
+	// return the cost (weighted distance between) of moving from "fromArea" to "area", or -1 if the move is not allowed
+	virtual float operator()( CNavArea *area, CNavArea *fromArea, const CNavLadder *ladder, const CFuncElevator *elevator, float length ) const
+	{
+		if ( fromArea == NULL )
+		{
+			// first area in path, no cost
+			return 0.0f;
+		}
+		else
+		{
+			if ( !m_me->GetLocomotionInterface()->IsAreaTraversable( area ) )
+			{
+				// our locomotor says we can't move here
+				return -1.0f;
+			}
+
+			// compute distance traveled along path so far
+			float dist;
+
+			if ( ladder )
+			{
+				dist = ladder->m_length;
+			}
+			else if ( length > 0.0 )
+			{
+				// optimization to avoid recomputing length
+				dist = length;
+			}
+			else
+			{
+				dist = ( area->GetCenter() - fromArea->GetCenter() ).Length();
+			}
+
+			float cost = dist + fromArea->GetCostSoFar();
+
+			// check height change
+			float deltaZ = fromArea->ComputeAdjacentConnectionHeightChange( area );
+			if ( deltaZ >= m_me->GetLocomotionInterface()->GetStepHeight() )
+			{
+				if ( deltaZ >= m_me->GetLocomotionInterface()->GetMaxJumpHeight() )
+				{
+					// too high to reach
+					return -1.0f;
+				}
+
+				// jumping is slower than flat ground
+				const float jumpPenalty = 5.0f;
+				cost += jumpPenalty * dist;
+			}
+			else if ( deltaZ < -m_me->GetLocomotionInterface()->GetDeathDropHeight() )
+			{
+				// too far to drop
+				return -1.0f;
+			}
+
+			return cost;
+		}
+	}
+
+	CSimpleBot *m_me;
+};
+
+
+#endif // SIMPLE_BOT_H