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</ref><ref name="jensen2001">{{cite book|chapter-url=http://jbit.net/~sparky/bssrdf.pdf|chapter=A Practical Model for Subsurface Light Transport|last2=Marschner|first2=S. R.|year=2001|website=graphics.ucsd.edu/~henrik/papers/bssrdf/|publisher=Proceedings of ACM SIGGRAPH 2001|pages=[https://archive.org/details/siggraph2001conf00fium/page/511 511–518]|doi=10.1145/383259.383319|last3=Levoy|first3=M.|last4=Hanrahan|first4=P.|last1=Jensen|first1=H. W.|title=Proceedings of the 28th annual conference on Computer graphics and interactive techniques - SIGGRAPH '01|accessdate=14 July 2014|isbn=978-1581133745|citeseerx=10.1.1.503.7787|url=https://archive.org/details/siggraph2001conf00fium/page/511}}</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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