Aye, Drawbridge, on reason that games are so fast is a simple fact : They don't use Ray-Tracing. They use shadow maps, and scan-line rendering. Up until Unreal II and Doom 3, something as simple as self-shadows has never been a reality. Ever noticed that? That in ANY video game, a character NEVER casts shadows on itself! I'll stick to ray-tracing, for now, or hybrid engines like Lightwave.