Keeps camera hit points instead of photons and shrinks each one's search radius as more photon passes arrive, so the estimate converges to the correct answer in bounded memory.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Photon Mappingphoton count is capped by memory, so bias never vanishes