Efficient Reflectance and Visibility Approximations for Environment Map Rendering |
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Authors: | Paul Green Jan Kautz Frédo Durand |
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Affiliation: | Massachusetts Institute of Technology, Computer Science and Artificial Intelligence Laboratory;University College London |
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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 glossy reflections. We demonstrate our method by fitting our representation to measured BRDF data, yielding high visual quality at real-time frame rates. |
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Keywords: | I 3 3 [Computer Graphics]: Picture/Image GenerationBitmap and frame buffer operations I 3 7 [Computer Graphics]: Three-Dimensional Graphics and Realism-Color Shading Shadowing and Texture |
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