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

		protected virtual void EnsureShadowTexturesCreated()
		{
			if ( shadowTextureConfigDirty )
			{
				DestroyShadowTextures();
				ShadowTextureManager.Instance.GetShadowTextures( shadowTextureConfigList, shadowTextures );

				// clear shadow cam - light mapping
				shadowCameraLightMapping.Clear();

				// Recreate shadow textures
				foreach ( Texture shadowTexture in shadowTextures )
				{
					// Camera names are local to SM
					String camName = shadowTexture.Name + "Cam";
					// Material names are global to SM, make specific
					String matName = shadowTexture.Name + "Mat" + this.Name;

					RenderTexture shadowRTT = shadowTexture.GetBuffer().GetRenderTarget();

					// Create camera for this texture, but note that we have to rebind
					// in PrepareShadowTextures to coexist with multiple SMs
					Camera cam = CreateCamera( camName );
					cam.AspectRatio = shadowTexture.Width / (Real)shadowTexture.Height;
					shadowTextureCameras.Add( cam );

					// Create a viewport, if not there already
					if ( shadowRTT.NumViewports == 0 )
					{
						// Note camera assignment is transient when multiple SMs
						Viewport v = shadowRTT.AddViewport( cam );
						v.SetClearEveryFrame(true);
						// remove overlays
						v.ShowOverlays = false;
					}

					// Don't update automatically - we'll do it when required
					shadowRTT.IsAutoUpdated = false;

					// Also create corresponding Material used for rendering this shadow
					Material mat = (Material)MaterialManager.Instance[ matName ];
					if ( mat == null )
					{
						mat = (Material)MaterialManager.Instance.Create( matName, ResourceGroupManager.InternalResourceGroupName );
					}
					Pass p = mat.GetTechnique( 0 ).GetPass( 0 );
					if ( p.TextureUnitStageCount != 1 /* ||
						 p.GetTextureUnitState( 0 ).GetTexture( 0 ) != shadowTexture */ )
					{
						mat.GetTechnique( 0 ).GetPass( 0 ).RemoveAllTextureUnitStates();
						// create texture unit referring to render target texture
						TextureUnitState texUnit = p.CreateTextureUnitState( shadowTexture.Name );
						// set projective based on camera
						texUnit.SetProjectiveTexturing( !p.HasVertexProgram, cam );
						// clamp to border colour
                        texUnit.SetTextureAddressingMode( TextureAddressing.Border );
						texUnit.TextureBorderColor = ColorEx.White;
						mat.Touch();
					}

					// insert dummy camera-light combination
					shadowCameraLightMapping.Add( cam, null );

					// Get null shadow texture
					nullShadowTexture = shadowTextureConfigList.Count == 0 ?
										null :
										ShadowTextureManager.Instance.GetNullShadowTexture( shadowTextureConfigList[ 0 ].format );
				}
				shadowTextureConfigDirty = false;
			}
		}