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The light cache is built by tracing many many eye paths from the camera. 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. 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.

For more details on how to adjust the Light cache GI render settings, please see the Light Cache Settings page.

Although very simple, the light-caching approach has many advantages over the photon map:

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