Alain <aze### [at] qwerty gov> wrote:
> The IOR for your gem may be to low, ruby's ior is higher than glass,
> close to 2 I think. Did you set the fade_distance and fade_power?
The IOR for Ruby is 1.76 and 1.768.
// CORUNDUM
// Variety: Ruby
// Variety: Sapphire
#declare Corundum_IOR_e_1 = 1.76;
#declare Corundum_IOR_w_1 = 1.768;
#declare Corundum_Birefringence_1 = 0.0080;
If you need more IOR values, take a look at my old NewIOR.inc file available
at http://seasoft.tecbox.com/Pov/NewIOR.html with IOR values for almost
3000 minerals. It also includes severals gemstone cuts in POV-Ray format.
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