Marc Champagne wrote:
> 
> Hi Folks,
> 
> Since POV-Ray simulates dispersion and allows values of 1 or higher, how
> does one take a real dispersion value like quartz (0.013) and apply it to
> the dispersion keyword?
> 
> Is it safe to assume that dispersion 1.013 will give us a simulated
> dispersion of 0.013?

Technical dispersion values are often given as the *difference* in ior
between two wavelengths while POV-Ray uses the *ratio* of ior values at
both ends of the spectrum.  Therefore your formula is approximately
correct although the wavelengths used for defining the dispersion are not
necessarily the ends of the visible spectrum.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
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Last updated 13 Aug. 2002 _____./\/^>_*_<^\/\.______

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