Samples the distribution of microfacet normals actually visible from the view direction, rather than the full distribution. Every sample is usable, and variance at high roughness drops sharply.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
Colour is the family; a dashed line is the second member of it.
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