Bidirectional scattering distribution function: Difference between revisions

Revision as of 02:00, 26 September 2021

Revision as of 14:23, 25 October 2021

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[[Image:BSSDF01 400.svg|thumb|right|250px|BRDF vs. BSSRDF]]

*'''BDF''' ('''Bidirectional distribution function''') is collectively defined by BRDF and BTDF.

*'''BRDF''' ('''[[Bidirectional reflectance distribution function]]''')<ref name="nicodemus1977">{{cite web|last1=Nicodemus|first1=F. E.|last2=Richmond|first2=J. C.|last3=Hsia|first3=J. J.|last4=Ginsberg|first4=I. W.|last5=Limperis|first5=T.|year=1977|title=Geometrical Considerations and Nomenclature for Reflectance|url=http://graphics.stanford.edu/courses/cs448-05-winter/papers/nicodemus-brdf-nist.pdf|publisher=Technical Report NBS MN-160, National Bureau of Standards|accessdate=14 July 2014}}

*'''BSSRDF''' ('''Bidirectional scattering-surface reflectance distribution function''' or '''Bidirectional surface scattering RDF''')<ref name=nicodemus1977>{{cite web

*'''BRDF''' ('''[[Bidirectional reflectance distribution function]]''')<ref name="nicodemus1977"/ref> is a simplified BSSRDF, assuming that light enters and leaves at the same point (''see the image on the right'').

|last1=Nicodemus

|first1=F. E.

|last2=Richmond

|first2=J. C.

|last3=Hsia

|first3=J. J.

|last4=Ginsberg

|first4=I. W.

|last5=Limperis

|first5=T.

|title=Geometrical Considerations and Nomenclature for Reflectance

|url=http://graphics.stanford.edu/courses/cs448-05-winter/papers/nicodemus-brdf-nist.pdf

|publisher=Technical Report NBS MN-160, National Bureau of Standards

|accessdate=14 July 2014

|year=1977}}

</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'').

*'''BSSRDF''' ('''Bidirectional scattering-surface reflectance distribution function''' or '''Bidirectional surface scattering RDF''')</ref name="nicodemus1977" /><ref name="jensen2001">{{cite book|chapter-last1=Jensen|first1=H. W.|url=httphttps://jbitarchive.netorg/~sparkydetails/bssrdf.pdfsiggraph2001conf00fium/page/511|chaptertitle=AProceedings Practicalof Modelthe for28th Subsurfaceannual Lightconference Transporton Computer graphics and interactive techniques - SIGGRAPH '01|last2=Marschner|first2=S. R.|yearlast3=2001Levoy|first3=M.|last4=Hanrahan|first4=P.|website=graphics.ucsd.edu/~henrik/papers/bssrdf/|publisher=Proceedings of ACM SIGGRAPH 2001|year=2001|isbn=978-1581133745|pages=[https://archive.org/details/siggraph2001conf00fium/page/511 511–518]|doichapter=10.1145/383259.383319|last3=Levoy|first3=M.|last4=Hanrahan|first4=P.|last1=Jensen|first1=H.A W.|title=ProceedingsPractical ofModel thefor 28thSubsurface annualLight conference on Computer graphics and interactive techniques - SIGGRAPH '01|accessdate=14 July 2014|isbn=978-1581133745Transport|citeseerx=10.1.1.503.7787|doi=10.1145/383259.383319|chapter-url=httpshttp://archivejbit.orgnet/details~sparky/siggraph2001conf00fium/page/511bssrdf.pdf|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.

* '''BSSTDF''' ('''Bidirectional scattering-surface transmittance distribution function''') is like BTDF but with subsurface scattering.

* '''BSSDF''' ('''Bidirectional scattering-surface distribution function''') is collectively defined by BSSTDF and BSSRDF. Also known as '''BSDF''' ('''Bidirectional scattering distribution function''').