Accurate fitting of measured reflectances using a Shifted Gamma micro-facet distribution
Abstract
Material models are essential to the production of photo-realistic images. Measured BRDFs provide accurate representation with complex visual appearance, but have larger storage cost. Analytical BRDFs such as Cook- Torrance provide a compact representation but fail to represent the effects we observe with measured appearance. Accurately fitting an analytical BRDF to measured data remains a challenging problem. In this paper we introduce the SGD micro-facet distribution for Cook-Torrance BRDF. This distribution accurately models the behavior of most materials. As a consequence, we accurately represent all measured BRDFs using a single lobe. Our fitting procedure is stable and robust, and does not require manual tweaking of the parameters.
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vitrine.png (1.73 Mo)
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10_colonialMaple_compare.png (613.61 Ko)
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2_aventurineSlice.png (293.28 Ko)
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8_aventurineCompare.png (744.76 Ko)
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9_lobes.png (386.77 Ko)
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materials.frag (1.9 Ko)
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materials.vert (669 B)
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plugin-EGSR2012.pdf (4.94 Mo)
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SGD_Params.csv (35.98 Ko)
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supplemental.pdf (68.13 Mo)
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