The animation feature of POV-Ray can be used to make it a spectral 
render engine. The basic idea is to render a set of gray-scale images
  - each representing a specific wavelength - and finally combine them 
using the CIE color match function.
To simplify this task I have created a few POV-Ray SDL scripts and some 
examples.
You'll find the download link, some images and more explanation here:

http://www.lilysoft.org/CGI/SR/Spectral%20Render.htm

-Ive

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