Daren Scot Wilson wrote:
> 
> It is a bad thing that the dispersion patch has a hard-coded spectrum.  What we
> need is user-defined spectra, and then I won't ever be troubled by such
> questions.   And clever artists could then do some weird things.
> 
> Consider the average refractor telescope's objective lens, or lenses in any
> optical instrument.  Normally these are made of two kinds of glass, for example
> crown glass and flint glass, with different dispersions.  How to model this in
> povray?
> 
> Lemme work on my IRTC entry, and in march I'll figure out how to allow
> user-defined dispersions.   In the meantime I'll accept ideas, suggestions.
> 
> Later, for an encore, maybe I'll do birefringent materials and polarization...
> 

I'm implementing dispersion with photon-mapping (using your code), and I will
soon switch to some form of user-defined spectra (at least for light sources...
so you can define monochromatic yellow or green+blue yellow, for example).

-Nathan

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