Eurographics 2011 LLHNDLJDNO LK Background Analytical models for BRDFs e.g. Anisotropic Ward model H·X H. x exp-2 ay (N·D(N·R)4ax 1+(H·N) Usually very compact Intuitively editable No analytical models for general btFsBackground • Analytical models for BRDFs – e.g. Anisotropic Ward model – Usually very compact – Intuitively editable • No analytical models for general BTFs