Anomalous Dispersion in Predictive Rendering

Andrea Weidlich, Alexander Wilkie
Anomalous Dispersion in Predictive Rendering
Computer Graphics Forum, 28(4):1065-1072, June 2009. []

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Abstract

In coloured media, the index of refraction does not decrease monotonically with increasing wavelength, but behaves in a quite non-monotonical way. This behaviour is called anomalous dispersion and results from the fact that the absorption of a material influences its index of refraction.

So far, this interesting fact has not been widely acknowledged by the graphics community. In this paper, we demonstrate how to calculate the correct refractive index for a material based on its absorption spectrum with the Kramers-Kronig relation, and we discuss for which types of objects this effect is relevant in practice.

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BibTeX

@article{weidlich-2009-dispersion,
  title =      "Anomalous Dispersion in Predictive Rendering",
  author =     "Andrea Weidlich and Alexander Wilkie",
  year =       "2009",
  abstract =   "In coloured media, the index of refraction does not decrease
               monotonically with increasing wavelength, but behaves in a
               quite non-monotonical way. This behaviour is called
               anomalous dispersion and results from the fact that the
               absorption of a material influences its index of
               refraction.   So far, this interesting fact has not been
               widely acknowledged by the graphics community. In this
               paper, we demonstrate how to calculate the correct
               refractive index for a material based on its absorption
               spectrum with the Kramers-Kronig relation, and we discuss
               for which types of objects this effect is relevant in
               practice. ",
  month =      jun,
  journal =    "Computer Graphics Forum",
  number =     "4",
  volume =     "28",
  pages =      "1065--1072",
  keywords =   "Predictive rendering, Spectral Rendering, Dispersion",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2009/weidlich-2009-dispersion/",
}