Precomputed Radiance Transfer

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Precomputed Radiance Transfer (PRT) is a technique used to render a scene in real time with complex light interactions precomputed. Radiosity can be used to determine the diffuse lighting of the scene, however PRT offers a method to dynamically change the lighting environment.

In essence, PRT computes the illumination of a point as a linear combination of incident irradiance. An efficient method must be used to encode this data, such as Spherical harmonics.

Reference: Sloan, Peter-Pike, Jan Kautz, and John Snyder. "Precomputed Radiance Transfer for Real-Time Rendering in Dynamic, Low-Frequency Lighting Environments". ACM Transactions on Graphics, Proceedings of the 29th Annual Conference on Computer Graphics and Interactive Techniques (SIGGRAPH), pp. 527-536. New York, NY: ACM Press, 2002.

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