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code/tools/PhysGun.Effects.cs

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+using Sandbox;
+using System.Linq;
+
+public partial class PhysGun
+{
+	Particles Beam;
+	Particles EndNoHit;
+
+	Vector3 lastBeamPos;
+	ModelEntity lastGrabbedEntity;
+
+	[Event.Frame]
+	public void OnFrame()
+	{
+		UpdateEffects();
+	}
+
+	protected virtual void KillEffects()
+	{
+		Beam?.Destroy( true );
+		Beam = null;
+		BeamActive = false;
+
+		EndNoHit?.Destroy( false );
+		EndNoHit = null;
+
+		if ( lastGrabbedEntity.IsValid() )
+		{
+			foreach ( var child in lastGrabbedEntity.Children.OfType<ModelEntity>() )
+			{
+				if ( child is Player )
+					continue;
+
+				child.GlowActive = false;
+				child.GlowState = GlowStates.GlowStateOff;
+			}
+
+			lastGrabbedEntity.GlowActive = false;
+			lastGrabbedEntity.GlowState = GlowStates.GlowStateOff;
+			lastGrabbedEntity = null;
+		}
+	}
+
+	protected virtual void UpdateEffects()
+	{
+		var owner = Owner;
+
+		if ( owner == null || !BeamActive || !IsActiveChild() )
+		{
+			KillEffects();
+			return;
+		}
+
+		var startPos = owner.EyePos;
+		var dir = owner.EyeRot.Forward;
+
+		var tr = Trace.Ray( startPos, startPos + dir * MaxTargetDistance )
+			.UseHitboxes()
+			.Ignore( owner )
+			.Run();
+
+		if ( Beam == null )
+		{
+			Beam = Particles.Create( "particles/physgun_beam.vpcf", tr.EndPos );
+		}
+
+		Beam.SetEntityAttachment( 0, EffectEntity, "muzzle", true );
+
+		if ( GrabbedEntity.IsValid() && !GrabbedEntity.IsWorld )
+		{
+			var physGroup = GrabbedEntity.PhysicsGroup;
+
+			if ( physGroup != null && GrabbedBone >= 0 )
+			{
+				var physBody = physGroup.GetBody( GrabbedBone );
+				if ( physBody != null )
+				{
+					Beam.SetPosition( 1, physBody.Transform.PointToWorld( GrabbedPos ) );
+				}
+			}
+			else
+			{
+				Beam.SetEntity( 1, GrabbedEntity, GrabbedPos, true );
+			}
+
+			lastBeamPos = GrabbedEntity.Position + GrabbedEntity.Rotation * GrabbedPos;
+
+			EndNoHit?.Destroy( false );
+			EndNoHit = null;
+
+			if ( GrabbedEntity is ModelEntity modelEnt )
+			{
+				lastGrabbedEntity = modelEnt;
+				modelEnt.GlowState = GlowStates.GlowStateOn;
+				modelEnt.GlowDistanceStart = 0;
+				modelEnt.GlowDistanceEnd = 1000;
+				modelEnt.GlowColor = new Color( 0.1f, 1.0f, 1.0f, 1.0f );
+				modelEnt.GlowActive = true;
+
+				foreach ( var child in lastGrabbedEntity.Children.OfType<ModelEntity>() )
+				{
+					if ( child is Player )
+						continue;
+
+					child.GlowState = GlowStates.GlowStateOn;
+					child.GlowDistanceStart = 0;
+					child.GlowDistanceEnd = 1000;
+					child.GlowColor = new Color( 0.1f, 1.0f, 1.0f, 1.0f );
+					child.GlowActive = true;
+				}
+			}
+		}
+		else
+		{
+			lastBeamPos = tr.EndPos;// Vector3.Lerp( lastBeamPos, tr.EndPos, Time.Delta * 10 );
+			Beam.SetPosition( 1, lastBeamPos );
+
+			if ( EndNoHit == null )
+				EndNoHit = Particles.Create( "particles/physgun_end_nohit.vpcf", lastBeamPos );
+
+			EndNoHit.SetPosition( 0, lastBeamPos );
+		}
+	}
+}