A microfacet normal distribution with a much longer tail than Beckmann. The tail is the whole point: it reproduces the soft, wide falloff around highlights that measured materials show and Beckmann clips off.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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specializesis a specific case of Microfacet Modelsupplies a long-tailed slope distribution as D
alternative-tois a competing approach to Beckmann Distributionlonger tail fits measured materials better