I have retooled the POV-Ray sample scene diffract.pov to use Ive's spectral
render rig.  The three colored light sources were replaced with a single light
source, and the iridescence was removed until someone can figure out how to
implement it spectrally.  The specular highlight was set at 5%, which seems to
me a good compromise in the absence of the implementation of non-metallic
Fresnel highlights.

Sample renders are in p.b.i.

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Download 'refract-spectral.zip' (3 KB)