Keeps four moments of the depth distribution rather than two, which tightens the bound enough to suppress the light leaking that two moments cannot represent.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Variance Shadow Mapstwo moments light-leak between separated occluders
References
Moment Shadow Mapping — Peters, Klein — 2015 · link