Global Illumination with Photon Map Compensation

Information

  • Publication Type: Technical Report
  • Workgroup(s)/Project(s): not specified
  • Date: January 2001
  • Number: TR-186-2-01-04
  • Keywords: radiance estimation, photon map, global illumination

Abstract

We present a new method for the simulation of global illumination by utilization of a photon map. It uses an advanced radiance estimation which, in contrast to classical nearest neighbor area estimation, does not assume that the nearest neighbor photons lie in one plane or that they are uniformly distributed around the illuminated point. This allows us to correcly handle indirect illumination, eg. caustics, at edges and corners of objects without causing illumination artefacts in the vicinity of the edges and corners. We show how high quality results can be achieved by directly visualizing this illumination estimate without the usual low frequency noise of photon maps and without requiring a very large photon map.

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BibTeX

@techreport{Hey-2001-Glo,
  title =      "Global Illumination with Photon Map Compensation",
  author =     "Heinrich Hey and Werner Purgathofer",
  year =       "2001",
  abstract =   "We present a new method for the simulation of global
               illumination by utilization of a photon map. It uses an
               advanced radiance estimation which, in contrast to classical
               nearest neighbor area estimation, does not assume that the
               nearest neighbor photons lie in one plane or that they are
               uniformly distributed around the illuminated point. This
               allows us to correcly handle indirect illumination, eg.
               caustics, at edges and corners of objects without causing
               illumination artefacts in the vicinity of the edges and
               corners. We show how high quality results can be achieved by
               directly visualizing this illumination estimate without the
               usual low frequency noise of photon maps and without
               requiring a very large photon map.",
  month =      jan,
  number =     "TR-186-2-01-04",
  address =    "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
  institution = "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology ",
  note =       "human contact: technical-report@cg.tuwien.ac.at",
  keywords =   "radiance estimation, photon map, global illumination",
  URL =        "/research/publications/2001/Hey-2001-Glo/",
}