An Analytical Model for Skylight Polarisation

Alexander Wilkie, Robert F. Tobler, Christiane Ulbricht, Georg Zotti, Werner Purgathofer
An Analytical Model for Skylight Polarisation
In Proceedings of the Eurographics Symposium on Rendering, pages 387-399. June 2004.
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Abstract

Under certain circumstances the polarisation state of the illumination can have a significant influence on the appearance of scenes; outdoor scenes with specular surfaces -- such as water bodies or windows -- under clear, blue skies are good examples of such environments. In cases like that it can be essential to use a polarising renderer if a true prediction of nature is intended, but so far no polarising skylight models have been presented. This paper presents a plausible analytical model for the polarisation of the light emitted from a clear sky. Our approach is based on a suitable combination of several components with well-known characteristics, and yields acceptable results in considerably less time than an exhaustive simulation of the underlying atmospheric scattering phenomena would require.

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@inproceedings{Wilkie-2004-AMS,
  title =      "An Analytical Model for Skylight Polarisation",
  author =     "Alexander Wilkie and Robert F. Tobler and Christiane
               Ulbricht and Georg Zotti and Werner Purgathofer",
  year =       "2004",
  abstract =   "Under certain circumstances the polarisation state of the
               illumination can have a significant influence on the
               appearance of scenes; outdoor scenes with specular surfaces
               -- such as water bodies or windows -- under clear, blue
               skies are good examples of such environments. In cases like
               that it can be essential to use a polarising renderer if a
               true prediction of nature is intended, but so far no
               polarising skylight models have been presented.    This
               paper presents a plausible analytical model for the
               polarisation of the light emitted from a clear sky. Our
               approach is based on a suitable combination of several
               components with well-known characteristics, and yields
               acceptable results in considerably less time than an
               exhaustive simulation of the underlying atmospheric
               scattering phenomena would require.",
  pages =      "387--399",
  month =      jun,
  booktitle =  "Proceedings of the Eurographics Symposium on Rendering",
  editor =     "Alexander Keller and Henrik Wann Jensen ",
  isbn =       "3-905673-12-6",
  publisher =  "?",
  keywords =   "skylight rendering, polarisation",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2004/Wilkie-2004-AMS/",
}