> Doing so would essentially require rewriting or bypassing almost all the
> rendering code. To POV-Ray, colors are RGB triples, sometimes with
> filter and transmit as well. It doesn't know anything about wavelengths.

She's not asking about that. The different "wavelengths" she seems to be
refering to does not mean that POV-ray needs to be coded to actually
understand wavelengths, but the surface reflectivity of a certain
wavelength could be modeled on one pass, and then you could change the
model each pass for each different wavelength. It's not like she needs to
model non-linear optical effects.

In fact, a good example of POV-ray actually pretending to understand
wavelengths is when colored diffraction with photons is used. How many
different "colors" you want to smoothly portrait the spectrum can be set.

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