Ray Maps for Global Illumination

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• Publication Type: Conference Paper

@inproceedings\{havran-2005-egsr,
  title =      "Ray Maps for Global Illumination",
  author =     "Vlastimil Havran and Ji{\v r}{\' i} Bittner and Robert
               Herzog and Hans-Peter Seidel",
  year =       "2005",
  abstract =   "We describe a novel data structure for representing light
               transport called ray map. The ray map extends the concept of
               photon maps: it stores not only photon impacts but the whole
               photon paths. We demonstrate the utility of ray maps for
               global illumination by eliminating boundary bias and
               reducing topological bias of density estimation in global
               illumination. Thanks to the elimination of boundary bias we
               could use ray maps for fast direct visualization with the
               image quality being close to that obtained by the expensive
               nal gathering step. We describe in detail our
               implementation of the ray map using a lazily constructed
               kD-tree. We also present several optimizations bringing the
               ray map query performance close to the performance of the
               photon map.",
  pages =      "43--54",
  booktitle =  "Eurographics Symposium on Rendering",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-egsr/",
}