Computing and applying variable-resolution data for bidirectional scattering distribution functions

TitleComputing and applying variable-resolution data for bidirectional scattering distribution functions
Publication TypeReport
Year of Publication2011
AuthorsGregory J Ward
Date Published09/2011
TypeDOE Technical Report
Abstract

We introduce the Tensor Tree representation for bidirectional scattering distribution functions (BSDFs), a variable-resolution data structure designed to minimize storage and computation. We offer a method for reducing full-resolution BSDF data into this format, and relate techniques for the efficient generation of uniformly weighted Monte Carlo samples. The Tensor Tree BSDF representation has been tested and incorporated into the 4.1 release of LBNL's Radiance lighting simulation and rendering system, with additional methods for modeling the appearance of complex fenestration systems. Finally, an independent software library is described for third-party developers who wish to support BSDF data outside of Radiance, and recommendations are made for future development directions.

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