01270nas a2200109 4500008004100000245010400041210006900145260001200214520083900226100002201065856007301087 2011 eng d00aComputing and applying variable-resolution data for bidirectional scattering distribution functions0 aComputing and applying variableresolution data for bidirectional c09/20113 a

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.

1 aWard, Gregory, J. uhttps://facades.lbl.gov/publications/computing-and-applying-variable