A Gaussian distribution of microfacet slopes, derived from physical optics. Its tail falls off quickly, so highlights end more abruptly than measured materials do.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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specializesis a specific case of Microfacet Modelsupplies a Gaussian slope distribution as D
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alternative-toGGX / Trowbridge-Reitz is a competing approach to thislonger tail fits measured materials better