UCL Discovery

Abstract

We present a technique for approximating isotropic BRDFs and precomputed self-occlusion that enables accurate and efficient prefiltered environment map rendering. Our approach uses a nonlinear approximation of the BRDF as a weighted sum of isotropic Gaussian functions. Our representation requires a minimal amount of storage, can accurately represent BRDFs of arbitrary, sharpness, and is above all, efficient to render. We precompute visibility, due to self-occlusion and store a low-frequency approximation suitable for gloss), reflections. We demonstrate our method by fitting our representation to measured BRDF data, yielding high visual quality at real-timeframe rates.