Abstract
The BRDF describes optical scatter off realistic surfaces. The microfacet BRDF model assumes geometric optics but is computationally simple compared to wave optics models. Previously, densely-sampled MERL BRDF data for several materials was analyzed using a novel variation of a microfacet BRDF that used a polarization factor in place of the cross section conversion and geometric attenuation terms, demonstrating improved accuracy. This paper extends that analysis to examine high-fidelity grazing angle BRDF data measured in-plane with the novel BRDF modification. Results indicate that for many materials the novel BRDF modification is more accurate than the Traditional Cook-Torrance BRDF at near grazing angles. We show as much as an order of magnitude improvement in the fit error using this novel BRDF modification. These results are expected to lead to more accurate BRDF modeling for remote sensing, computer graphics, and scene generation.
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