Eurographics 2011 LLPNDUD口L angor unIversity School of Computer Science 11-15 April 2011 A Sparse Parametric Mixture Model for BTF Compression, Editing and Rendering Hongzhi wi Julie dorsey LUX ET VERITAS Holly rushmeier Yale UniversityA Sparse Parametric Mixture Model for BTF Compression, Editing and Rendering Hongzhi Wu Julie Dorsey Holly Rushmeier Yale University