The light-caching approach works efficiently with any lights - including skylight, self-illuminated objects, non-physical lights, photometric lights etc. Rays are only traced from the camera, as opposed to the photon map, which must process each light in the scene and usually requires separate setup for each light. On the other hand, in a sense, it is the exact opposite of the photon map, which traces paths from the lights, and stores the accumulated energy from the beginning of the path into the photon map.Īlthough very simple, the light-caching approach has many advantages over the photon map: Each of the bounces in the path stores the illumination from the rest of the path into a 3d structure, very similar to the photon map. The light cache is built by tracing many many eye paths from the camera. It is very similar to photon mapping, but without many of its limitations. This method was developed originally by Chaos specifically for the V-Ray renderer. Light caching (called "light mapping" in older versions of V-Ray) is a technique for approximating the global illumination in a scene.
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