Axiom.Core.SceneManager.FindLightsAffectingFrustum C# (CSharp) Method

		protected virtual void FindLightsAffectingFrustum( Camera camera )
		{
			// Basic iteration for this scene manager
			this.lightsAffectingFrustum.Clear();

			MovableObjectCollection lightList = this.GetMovableObjectCollection( LightFactory.TypeName );

			// sphere to use for testing
			Sphere sphere = new Sphere();

			foreach ( Light light in lightList.Values )
			{
				if ( light.IsVisible )
				{
					if ( light.Type == LightType.Directional )
					{
						// Always visible
						this.lightsAffectingFrustum.Add( light );
					}
					else
					{
						// treating spotlight as point for simplicity
						// Just see if the lights attenuation range is within the frustum
						sphere.Center = light.DerivedPosition;
						sphere.Radius = light.AttenuationRange;

						if ( camera.IsObjectVisible( sphere ) )
						{
							this.lightsAffectingFrustum.Add( light );
						}
					}
				}
			}

			// notify light dirty, so all movable objects will re-populate
			// their light list next time
			NotifyLightsDirty();
		}