Entry Christensen:1999:FPM from jgraphtools.bib

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BibTeX entry

@Article{Christensen:1999:FPM,
  author =       "Per H. Christensen",
  title =        "Faster Photon Map Global Illumination",
  journal =      j-J-GRAPHICS-TOOLS,
  volume =       "4",
  number =       "3",
  pages =        "1--10",
  year =         "1999",
  CODEN =        "JGTOFD",
  ISSN =         "1086-7651",
  ISSN-L =       "1086-7651",
  bibdate =      "Thu Oct 12 17:08:13 2000",
  bibsource =    "http://www.acm.org/jgt/issues.html;
                 http://www.math.utah.edu/pub/tex/bib/jgraphtools.bib",
  URL =          "http://www.acm.org/jgt/papers/Christensen99/",
  abstract =     "The photon map method is an extension of ray tracing
                 that makes it able to efficiently compute caustics and
                 soft indirect illumination on surfaces and in
                 participating media. This paper describes a method to
                 further speed up the computation of soft indirect
                 illumination (diffuse-diffuse light transport such as
                 color bleeding) on surfaces. The speed-up is based on
                 the observation that the many look-ups in the global
                 photon map during final gathering can be simplified by
                 precomputing local irradiance values at the photon
                 positions. Our tests indicate that the calculation of
                 soft indirect illumination during rendering, which is
                 the most time-consuming part, can be sped up by a
                 factor of 5--7 in typical scenes at the expense of (1)
                 a precomputation that takes about 2\%--5\% of the time
                 saved during rendering and (2) a 28\% increase of
                 memory use.",
  acknowledgement = ack-nhfb,
  journal-URL =  "http://www.tandfonline.com/loi/ujgt20",
}

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