I would like to render a material that has nonlinear dispersion.  For example,
the dispersion property allows us to set only a single parameter giving us the
strength of dispersion.  I don't know for sure about the implementation here,
but I am assuming that this means that the index of refraction has a linear
dependence on wavelength (color).

I want to specify the index of refraction for each color, in the number of steps
that I specify (just as with dispersion) only in a customized way, for example:

n=2 for red part of spectrum
n=1 for middle part of spectrum
n=3 for violet part of spectrum

Since I cannot do this with the dispersion property, how can I do this?  This
looks like it should be very easy to implement, given that POV-Ray can already
handle normal dispersion.  I just need to access the array where the indices
are held, if that is how dispersion works.

Any suggestion or help is very much appreciated.

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