In an image processing system, a method for generating a images includes rendering graphical models comprising a scene to separate image layers called "gsprites," and then compositing these image layers to generate an image. An image processor can retrieve gsprites from memory, transform them, and composite...http://www.google.de/patents/US5867166?utm_source=gb-gplus-sharePatent US5867166 - Method and system for generating images using Gsprites
Method and system for generating images using Gsprites