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I've inserted a link to an available pdf of the paper. I'm not sure, if it is right to link to this source. |
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|accessdate=14 July 2014
|year=1977}}
</ref><ref name="jensen2001">{{cite web|url=http://jbit.net/~sparky/bssrdf.pdf|title=A Practical Model for Subsurface Light Transport|last2=Marschner|first2=S. R.|date=|year=2001|website=http://graphics.ucsd.edu/~henrik/papers/bssrdf/|publisher=Proceedings of ACM SIGGRAPH 2001|pages=511–518|doi=10.1145/383259.383319|archive-url=|archive-date=|dead-url=|last3=Levoy|first3=M.|last4=Hanrahan|first4=P.|last1=Jensen|first1=H. W.|accessdate=14 July 2014}}</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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