Precomputed Radiance Transfer
Precomputed Radiance Transfer (PRT) is a
Radiosity methods can be used to determine the diffuse lighting of the scene, however PRT offers a method to dynamically change the lighting environment.[1]
In essence, PRT computes the illumination of a point as a linear combination of incident
spherical harmonics
.
When spherical harmonics are used to approximate the light transport function, only low-frequency effects can be handled with a reasonable number of parameters. Ren Ng et al.[2] extended this work to handle higher frequency shadows by replacing spherical harmonics with non-linear wavelets.
Teemu Mäki-Patola gives a clear introduction to the topic based on the work of Peter-Pike Sloan et al.[3] At SIGGRAPH 2005, a detailed course on PRT was given.[4]
References
- ^ "Precomputed Radiance Transfer for Real-Time Rendering in Dynamic, Low-Frequency Lighting Environments" (PDF), harvard.edu: Peter-Pike Sloan, Jan Kautz, John Snyder, retrieved 22 September 2019
- . Retrieved 2023-08-23.
- CiteSeerX 10.1.1.131.6778.
- ^ Jan Kautz; Peter-Pike Sloan; Jaakko Lehtinen. "Precomputed Radiance Transfer: Theory and Practice". SIGGRAPH 2005 Courses. Retrieved 2009-02-25.
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