Learns an approximation of the incident radiance distribution during rendering and samples directions from it, so paths head toward light rather than being drawn from the BSDF alone.
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 Path TracingBSDF sampling ignores where the light actually is
requiresdoes not work without Importance Samplingthe learned distribution is used as the sampling pdf
References
Practical Path Guiding for Efficient Light-Transport Simulation — Muller, Gross, Novak — 2017 · link