A BRDF and a BTDF taken together, defined over the whole sphere rather than the upper hemisphere, so that one function describes both sides of a surface.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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extendsadds capability to BRDFcovers the transmitted hemisphere as well
Referenced by
extendsBSSRDF adds capability to thislight can leave far from where it entered
validatesEnergy Conservation is a test for thisthe BSDF integrated over the sphere must not exceed 1
extendsHair Scattering Model adds capability to thisa fibre scatters around its axis, not a normal
validatesHelmholtz Reciprocity is a test for thisswapping the directions must not change the value
specializesMicrofacet Model is a specific case of thisderives the BSDF from a statistical surface model