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Radiosity renders the light that bounces off matte surfaces.
Since light from the bulb is focused downward, none of it reaches the ceiling directly. This is a problem because a ray tracer, which does not see indirect light, paints that ceiling black.
Direct light RadiosityThe left render, lit like my old college dormitory, depicts only light that ar...
The two renders above show one scene. gman's z-buffer shades each surface from its lights alone and never asks what stands between them, so nothing casts a shadow.
Shadows, mirrors and glass all come from one move: fire a ray and see what it hits.
One ray per pixelA ray tracer follows light from the eye to the lamp. Almost none o...