U.S. Patent Jun. 19, 2007 Sheet 2 0f 14 US 7,233,326 B1 Application Controi 200 1 Derived Object Representation 246 P'Xe! Data 256 Derived Object 270 Rendering Pipeline 250 . Display Buffer A 260 Object Space Modi?er 220 Figure 2 Modi?er Stack 280 k