01680nas a2200157   4500008003900000245011100039210006900150260001200219520106500231653005301296653004101349100002201390700001601412700002101428856007301449       2012                          d00aA Practical Framework for Sharing and Rendering Real-World Bidirectional Scattering Distribution Functions0 aPractical Framework for Sharing and Rendering RealWorld Bidirect  c10/20123 a<p>The utilization of real-world materials has been hindered by a lack of standards for sharing and interpreting measured data. This paper presents an XML representation and an Open Source C library to support bidirectional scattering distribution functions (BSDFs) in data-driven lighting simulation and rendering applications.The library provides for the efficient representation, query, and Monte Carlo sampling of arbitrary BSDFs in amodel-free framework. Currently, we support two BSDF data representations: one using a fixed subdivision of thehemisphere, and one with adaptive density. The fixed type has advantages for certain matrix operations, while theadaptive type can more accurately represent highly peaked data. We discuss advanced methods for data-driven BSDF rendering for both types, including the proxy of detailed geometry to enhance appearance and accuracy. We also present an advanced interpolation method to reduce measured data into these standard representations. We end with our plan for future extensions and sharing of BSDF data.</p>10abuilding technology and urban systems department10awindows and envelope materials group1 aWard, Gregory, J.1 aKurt, Murat1 aBonneel, Nicolas  uhttps://facades.lbl.gov/publications/practical-framework-sharing-and