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

		protected internal virtual void PrepareShadowTextures( Camera camera, Viewport viewPort )
		{
			// Set the illumination stage, prevents recursive calls
			IlluminationRenderStage savedStage = this.illuminationStage;
			this.illuminationStage = IlluminationRenderStage.RenderToTexture;

			// Determine far shadow distance
			float shadowDist = this.shadowFarDistance;
			if ( shadowDist == 0.0f )
			{
				// need a shadow distance, make one up
				shadowDist = camera.Near * 300;
			}
			// set fogging to hide the shadow edge
			float shadowOffset = shadowDist * this.shadowTextureOffset;
			// Precalculate fading info
			float shadowEnd = shadowDist + shadowOffset;
			float fadeStart = shadowEnd * this.shadowTextureFadeStart;
			float fadeEnd = shadowEnd * this.shadowTextureFadeEnd;
			// Additive lighting should not use fogging, since it will overbrighten; use border clamp
			if ( !this.IsShadowTechniqueAdditive )
			{
				this.shadowReceiverPass.SetFog( true,
												FogMode.Linear,
												ColorEx.White,
												0,
												fadeStart,
												fadeEnd );
				// if we have a custom receiver material, then give it the fog params too
				if ( this.shadowTextureCustomReceiverPass != null )
				{
					this.shadowTextureCustomReceiverPass.SetFog( true,
																 FogMode.Linear,
																 ColorEx.White,
																 0,
																 fadeStart,
																 fadeEnd );
				}
			}
			else
			{
				// disable fogging explicitly
				this.shadowReceiverPass.SetFog( true, FogMode.None );
				// if we have a custom receiver material, then give it the fog params too
				if ( this.shadowTextureCustomReceiverPass != null )
				{
					this.shadowTextureCustomReceiverPass.SetFog( true, FogMode.None );
				}
			}

			// Iterate over the lights we've found, max out at the limit of light textures
			int sti = 0;
			foreach ( Light light in this.lightsAffectingFrustum )
			{
				// Check limit reached
				if ( sti == this.shadowTextures.Count )
					break;

				// Skip non-shadowing lights
				if ( !light.CastShadows )
				{
					continue;
				}

				Texture shadowTex = this.shadowTextures[ sti ];
				RenderTarget shadowRTT = shadowTex.GetBuffer().GetRenderTarget();
				Viewport shadowView = shadowRTT.GetViewport( 0 );
				Camera texCam = this.shadowTextureCameras[ sti ];

				// rebind camera, incase another SM in use which has switched to its cam
				shadowView.Camera = texCam;

				// Associate main view camera as LOD camera
				texCam.LodCamera = camera;

				//Vector3 dir;

				// set base
				if ( light.Type == LightType.Point )
					texCam.Direction = light.DerivedDirection;
				if ( light.Type == LightType.Directional )
					texCam.Position = light.DerivedPosition;

				// Use the material scheme of the main viewport
				// This is required to pick up the correct shadow_caster_material and similar properties.
				shadowView.MaterialScheme = viewPort.MaterialScheme;

				if ( light.CustomShadowCameraSetup == null )
				{
					_defaultShadowCameraSetup.GetShadowCamera( this, camera, viewPort, light, texCam, sti );
				}
				else
				{
					light.CustomShadowCameraSetup.GetShadowCamera( this, camera, viewPort, light, texCam, sti );
				}

				shadowView.BackgroundColor = ColorEx.White;

				// Fire shadow caster update, callee can alter camera settings
				// fireShadowTexturesPreCaster(light, texCam);

				// Update target
				shadowRTT.Update();

				++sti;
			}
			// Set the illumination stage, prevents recursive calls
			this.illuminationStage = savedStage;

			//fireShadowTexturesUpdated( std::min(mLightsAffectingFrustum.size(), mShadowTextures.size()));
		}