Builds a hierarchy over the light sources and descends it stochastically using bounds on each cluster's contribution, so shading cost grows with the log of the light count instead of linearly.
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.
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correctsfixes a defect in Instant Radiositycost grows linearly in the number of virtual lights
extendsadds capability to Next Event Estimationpicks which light to sample when there are thousands
References
Importance Sampling of Many Lights with Adaptive Tree Splitting — Conty Estevez, Kulla — 2018 · link