Random-walks light between microfacets instead of discarding whatever the masking term blocks. Rough metals stop going dark, which is the visible symptom of the energy single-scattering models throw away.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Smith Masking-Shadowingsome hits are lost in scatter, never re-emitted
Referenced by
approximatesKulla-Conty Energy Compensation is a cheaper stand-in for thisadds lost energy back from a table instead of walking
References
Multiple-Scattering Microfacet BSDFs with the Smith Model — Heitz, Hanika, d'Eon, Dachsbacher — 2016 · link