Precomputed Radiance Transfer
Jan Kautz,
Peter-Pike Sloan, John Snyder.
Precomputed Radiance Transfer allows interactive rendering of objects
illuminated by low-frequency environment maps, including
self-shadowing and interreflections. The expensive integration of
incident lighting is partially precomputed and stored as matrices.
Both the lighting as well as the transfer functions are represented in the
spherical harmonics basis. This reduces the expensive integration to
simple and fast matrix-vector multiplications.
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