Accounts for the fact that a microfacet hidden from the light is likely to be hidden from the view as well, since both depend on the same height field.
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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correctsfixes a defect in Smith Masking-Shadowingincident and exitant masks are related, not independent
References
Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs — Heitz — 2014 · link