The development of real time scene generation for simulating a real world environment has come a long way since its modest inception over three decades ago. Nonprogrammed real time scene generation systems date back as early as 1939 when a simple cloud simulator was attached to a Link AN-T-18 basic flight trainer. The cloud simulator was comprised of a point light source which projected cloud images from a film transparency onto a screen. Since this simple beginning, point light source techniques have been refined, optical image generation systems have been devised, semiprogrammed motion picture systems have been produced, and complex television systems with camera-model, film, and computer generated imagery have been developed. As a result, current scene generation technology provides the capability to simulate in real time a real-world visual scene for most commercial and military vehicle operator tasks.