RenderTargetHandle GetRenderTarget( string name, ImageFormat format, int numMips, int sizeFactor )

RenderTargetHandle GetRenderTarget( string name, int sizeFactor, ImageFormat colorFormat, ImageFormat depthFormat, MultisampleAmount msaa, int numMips )

RenderTargetHandle GetRenderTarget( string name, int width, int height, ImageFormat colorFormat, ImageFormat depthFormat, MultisampleAmount msaa, int numMips )