A Critical Review of the Preetham Skylight Model

• Information
  
• Abstract
  
• Additional Files and Images
  
• BibTeX
  

• Publication Type: Conference Paper
• Date (from): Jan.29th, 2007
• Date (to): Feb.1st, 2007
• Editor: Vaclav Skala
• ISBN: 978-80-86943-02-2
• Lecturer: Georg Zotti
• Location: Plzen
• Publisher: University of West Bohemia
• Keywords: Skylight, Verification

We have implemented the model in Mathematica, visualise and discuss those parameter ranges which exhibit problematic behaviour, and compare the computed luminance values with references from literature, especially the 15 standard skylight distributions of the CIE 2003 Standard General Sky.

We also performed luminance measurements on real cloudless skies, and compare these measurements to the predictions of the model.

@inproceedings\{zotti-2007-wscg,
  title =      "A Critical Review of the Preetham Skylight Model",
  author =     "Georg Zotti and Alexander Wilkie and Werner Purgathofer",
  year =       "2007",
  abstract =   "The Preetham skylight model is currently one of the most
               widely used   analytic models of skylight luminance in
               computer graphics.   Despite its widespread use, very little
               work has been carried out to verify the results generated by
               the model, both in terms of the luminance patterns it
               generates, and in terms of numerical reliability and
               stability.  We have implemented the model in Mathematica,
               visualise and discuss those parameter ranges which exhibit
               problematic behaviour, and compare the computed luminance
               values with references from literature, especially the 15
               standard skylight distributions of the CIE 2003 Standard
               General Sky.  We also performed luminance measurements on
               real cloudless skies, and compare these measurements to the
               predictions of the model.",
  pages =      "23--30",
  month =      jan,
  booktitle =  "WSCG ' 2007 Short Communications Proceedings I",
  editor =     "Vaclav Skala",
  isbn =       "978-80-86943-02-2",
  publisher =  "University of West Bohemia",
  location =   "Plzen",
  keywords =   "Skylight, Verification",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2007/zotti-2007-wscg/",
}