Smith Masking-Shadowing

Computer Graphics · Materials and BSDFs · 1967 · smith-masking.yaml

Derives the fraction of microfacets visible from a given direction from the normal distribution itself, rather than being an independent invented function. Consistency with D is what makes it the standard choice.

• 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.

This node

• part-ofis a subtopic of Microfacet Model

Referenced by

• correctsHeight-Correlated Smith fixes a defect in thisincident and exitant masks are related, not independent
• requiresMicrofacet Model does not work without thismicrofacets occlude each other at grazing angles
• correctsMultiple-Scattering Microfacet BSDF fixes a defect in thissome hits are lost in scatter, never re-emitted

References

• Geometrical Shadowing of a Random Rough Surface — Smith — 1967 · link