Trace particles from the lights, store their hits in a spatial structure, then estimate radiance at camera hit points by density estimation over nearby photons. Biased but consistent.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Path Tracingcaustics through glass essentially never converge
alternative-tois a competing approach to Bidirectional Path Tracingcaches light subpaths instead of connecting to them
Referenced by
correctsProgressive Photon Mapping fixes a defect in thisphoton count is capped by memory, so bias never vanishes
References
Global Illumination using Photon Maps — Jensen — 1996 · link