3D graphics eBook - Course Materials Repository

Potentially visible set 114
External links
Cited author's pages (including publications):
• Jiri Bittner (http:/ / www. cgg. cvut. cz/ ~bittner/ )
• Daniel Cohen-Or (http:/ / www. math. tau. ac. il/ ~dcor/ )
• Fredo Durand (http:/ / people. csail. mit. edu/ fredo/ )
• Denis Haumont (http:/ / www. ulb. ac. be/ polytech/ sln/ team/ dhaumont/ dhaumont. html)
• Shaun Nirenstein (http:/ / www. nirenstein. com)
• Seth Teller (http:/ / people. csail. mit. edu/ seth/ )
• Peter Wonka (http:/ / www. public. asu. edu/ ~pwonka/ )
Other links:
• Selected publications on visibility (http:/ / artis. imag. fr/ ~Xavier. Decoret/ bib/ visibility/ )
Precomputed Radiance Transfer
Precomputed Radiance Transfer (PRT) is a computer graphics technique used to render a scene in real time with
complex light interactions being precomputed to save time. Radiosity methods 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.
When spherical harmonics is used to approximate the light transport function, only low frequency effect can be
handled with a reasonable number of parameters. Ren Ng 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. [1] At
SIGGRAPH 2005, a detailed course on PRT was given. [2]
References
[1] Teemu Mäki-Patola (2003-05-05). "Precomputed Radiance Transfer" (http:/ / citeseerx. ist. psu. edu/ viewdoc/ summary?doi=10. 1. 1. 131.
6778) (PDF). Helsinki University of Technology. . Retrieved 2008-02-25.
[2] Jan Kautz; Peter-Pike Sloan, Jaakko Lehtinen. "Precomputed Radiance Transfer: Theory and Practice" (http:/ / www. cs. ucl. ac. uk/ staff/ j.
kautz/ PRTCourse/ ). SIGGRAPH 2005 Courses. . Retrieved 2009-02-25.
• 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. (http:/ / www. mpi-inf. mpg. de/ ~jnkautz/ projects/ prt/ prtSIG02. pdf)
• NG, R., RAMAMOORTHI, R., AND HANRAHAN, P. 2003. All-Frequency Shadows Using Non-Linear
Wavelet Lighting Approximation. ACM Transactions on Graphics 22, 3, 376–381. (http:/ / graphics. stanford.
edu/ papers/ allfreq/ allfreq. press. pdf)