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code/tools/Light.cs

@@ -0,0 +1,116 @@
+namespace Sandbox.Tools
+{
+	[Library( "tool_light", Title = "Lights", Description = "A dynamic point light", Group = "construction" )]
+	public partial class LightTool : BaseTool
+	{
+		PreviewEntity previewModel;
+
+		private string Model => "models/light/light_tubular.vmdl";
+
+		protected override bool IsPreviewTraceValid( TraceResult tr )
+		{
+			if ( !base.IsPreviewTraceValid( tr ) )
+				return false;
+
+			if ( tr.Entity is LightEntity )
+				return false;
+
+			return true;
+		}
+
+		public override void CreatePreviews()
+		{
+			if ( TryCreatePreview( ref previewModel, Model ) )
+			{
+				previewModel.RelativeToNormal = false;
+				previewModel.OffsetBounds = true;
+				previewModel.PositionOffset = -previewModel.CollisionBounds.Center;
+			}
+		}
+
+		public override void Simulate()
+		{
+			if ( !Host.IsServer )
+				return;
+
+			using ( Prediction.Off() )
+			{
+				bool useRope = Input.Pressed( InputButton.Attack1 );
+				if ( !useRope && !Input.Pressed( InputButton.Attack2 ) )
+					return;
+
+				var startPos = Owner.EyePos;
+				var dir = Owner.EyeRot.Forward;
+
+				var tr = Trace.Ray( startPos, startPos + dir * MaxTraceDistance )
+					.Ignore( Owner )
+					.Run();
+
+				if ( !tr.Hit || !tr.Entity.IsValid() )
+					return;
+
+				CreateHitEffects( tr.EndPos );
+
+				if ( tr.Entity is LightEntity )
+				{
+					// TODO: Set properties
+
+					return;
+				}
+
+				var light = new LightEntity
+				{
+					Enabled = true,
+					DynamicShadows = false,
+					Range = 128,
+					Falloff = 1.0f,
+					LinearAttenuation = 0.0f,
+					QuadraticAttenuation = 1.0f,
+					Brightness = 1,
+					Color = Color.Random,
+				};
+
+				light.UseFogNoShadows();
+				light.SetModel( Model );
+				light.SetupPhysicsFromModel( PhysicsMotionType.Dynamic, false );
+				light.Position = tr.EndPos + -light.CollisionBounds.Center + tr.Normal * light.CollisionBounds.Size * 0.5f;
+
+				if ( !useRope )
+					return;
+
+				var rope = Particles.Create( "particles/rope.vpcf" );
+				rope.SetEntity( 0, light, Vector3.Down * 6.5f ); // Should be an attachment point
+
+				var attachEnt = tr.Body.IsValid() ? tr.Body.Entity : tr.Entity;
+				var attachLocalPos = tr.Body.Transform.PointToLocal( tr.EndPos ) * (1.0f / tr.Entity.Scale);
+
+				if ( attachEnt.IsWorld )
+				{
+					rope.SetPosition( 1, attachLocalPos );
+				}
+				else
+				{
+					rope.SetEntityBone( 1, attachEnt, tr.Bone, new Transform( attachLocalPos ) );
+				}
+
+				var spring = PhysicsJoint.Spring
+					.From( light.PhysicsBody, Vector3.Down * 6.5f )
+					.To( tr.Body, tr.Body.Transform.PointToLocal( tr.EndPos ) )
+					.WithFrequency( 5.0f )
+					.WithDampingRatio( 0.7f )
+					.WithReferenceMass( light.PhysicsBody.Mass )
+					.WithMinRestLength( 0 )
+					.WithMaxRestLength( 100 )
+					.WithCollisionsEnabled()
+					.Create();
+
+				spring.EnableAngularConstraint = false;
+				spring.OnBreak( () =>
+				{
+					rope?.Destroy( true );
+					spring.Remove();
+				} );
+			}
+		}
+	}
+}