Computes diffuse indirect irradiance at sparse points and interpolates between them, adding new samples only where the gradient estimate says the interpolation would be unreliable.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Path Tracingdiffuse indirect is smooth, so per-pixel sampling is wasted
Referenced by
approximatesIrradiance Probes is a cheaper stand-in for thisa fixed grid instead of adaptively placed samples
alternative-toNeural Radiance Cache is a competing approach to thisa learned cache instead of an interpolated one
References
A Ray Tracing Solution for Diffuse Interreflection — Ward, Rubinstein, Clear — 1988 · link