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Sven-Erik Andersen nous apporta ses lumieres ainsi en ce 2004/05/16
15:25... :
>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.
>
>
>
>
Thanks, it will help everybody to make better POV Ray gems.
I know, I over-estimated ruby's ior, but I don't have the adequate
refferences on hand.
Alain
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