It's done by wavelength.  The dispersion controls how far the ior
differs from the shortest to the highest wavelength.  The center
wavelength is always yellow, since that's what ior in the real world is
measured against (actually a thin line of sodium, which is yellow).

-Mike

Markus Becker wrote:
> 
> I thought I read somewhere along the threads that
> the dispersion patch has something like
> ior_min and ior_max implemented. I just downloadad
> it and can only find dispersion float and
> disp_nelems int in the "documentation".
> 
> How is the ior dispersed across the
> wavelengths?
> 
> Any tips? Or am I completely wrong here?
> 
> Markus
> 
> --

>  Ich nicht eine Sekunde!!!" H. Heinol in Val Thorens

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