>>  interior {
>>    ior 2.418
>>    dispersion 1.044

>Since the ior's range from about 2.407 to 2.452 (different charts have
>different ranges), the ior should be set to (2.407+2.452)/2, or about
>2.429, with a dispersion of (2.452/2.407), or about 1.0187.  If you're not
>as picky about the precision, try 2.43 and 1.019.

Hmm.. I think that I should set more correct iors and dispersions to some of
my materials. I didn't compare my charts and dispersion value isn't
calculated. It was taken from chart. Because material ior depends on light
wavelength it can't be calculated averaging two ior values. I should take
many ior values with known light wavelength and weight them with human
luminance response curve to calculate exact value. Formula to calculate
material dispersion is different than (max_ior/min_ior). I don't remember
correct formula now.

Matti

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