Precomputed Radiance Transfer

Precomputed Radiance Transfer (PRT ) is a technique in computer graphics that is used to render a scene with complex lighting interactions in real time. It relies on illumination information that is calculated once and only evaluated at runtime. PRT calculates the brightness of a point by a linear combination of incident light radiation, which is encoded by suitable functions.

Greger provides first use of spherical harmonics to store the brightness information and to process a first introduction to the subject, Sloan, Kautz and Snyder. Ng et al. replaced by non-linear functions of these wavelets, so that more complex lighting conditions can be displayed.

Swell

  • Gene Greger, Peter Shirley, Philip M. Hubbard, and Donald P. Greenberg. "The Irradiance Volume" (PDF)
  • Peter- Pike Sloan 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 (PDF)
  • Ren Ng, Ravi Ramamoorthi and Pat Hanrahan. " All- Frequency Shadows Using Non- linear wavelet lighting approximation ". ACM Transactions on Graphics 22, 3, 376-381. , 2003. (PDF)
  • Image synthesis
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