Spectral vs RGB rendering: why only a spectral renderer lights the green wall correctly
ssh4net · x · 2026-11-10
A simple but illustrative rendering case: when a narrow white light spot on a red wall should illuminate a nearby green wall, the RGB renderer gets it wrong while a spectral renderer handles the physics correctly. The author notes both renders are spectral—the second just applies AgX tone mapping so the light spot matches what the naked eye would see.
A useful reference for anyone working on photorealistic rendering or physical accuracy in generated imagery.
Related event: Spectral Rendering vs RGB: White Light on a Red Wall Exposes GI Distortion(4 posts)→
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