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|doi=10.1145/383259.383319
|year=2001}}</ref> describes the relation between outgoing radiance and the incident flux, including the phenomena like [[subsurface scattering]] (SSS). The BSSRDF describes how light is transported between any two rays that hit a surface.
*'''BRDF''' ('''[[Bidirectional reflectance distribution function]]''')<ref name="nicodemus1977"/> is a simplified BSSRDF, assuming that light enters and leaves at the same point (''see the image on the right'').
* '''BTDF''' ('''Bidirectional transmittance distribution function''')<ref name="bartell1980"/> is similar to BRDF but for the opposite side of the surface. (''see the top image'').
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