>And this is not. You forgot the light wavelenghts. Pov-Ray dispersion
>calculation make simple rainbow for light which ior will range from
>ior/sqrt(disp) to ior*sqrt(disp). To calculate correct dispersion value we
>need several ior values and the light wavelenghts used to measure ior
>values to approximate dispersion value.
>
>Matti
>

One problem.  POV-Ray 3.5 doesn't support that.  You simply specify an IOR
and a dispersion.  And as I said, and as you conceded, ior will range from
ior/sqrt(disp) to ior*sqrt(disp), which means disp = max_ior/min_ior.

If you want something more accurate, you have to either do multiple renders
with hand-tweaked iors/palettes, or you have to use something like MegaPOV.
 The last time I used MegaPOV was version 0.4, and it supported a
hand-configured palette for dispersion.

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