>       dispersion 1.4 dispersion_samples QQ_Disp //  <== PROBLEM

1.4 is quite high for dispersion, realistic values are in the range of  1.01
or so.  1.1 can give nice but unrealistic results.  The dispersion value is
basically the ratio of the ior for red to the ior for violet for a given
material.   I have an ior include file that has iors and dispersion values
for a lot of different materials and that is essentially how the values
look:

ior = (ior_red+ior_violet)/2
dispersion = ior_red/ior_violet

-tgq

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