Convolves the environment map against the BRDF lobe ahead of time, storing successively rougher versions in mip levels so a runtime lookup replaces a runtime integral.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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approximatesis a cheaper stand-in for Image-Based Lightingprefilter per roughness instead of sampling at runtime
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requiresSplit-Sum Approximation does not work without thisone of the two factors is the prefiltered map