On Sun, 28 Jul 2002 23:33:23 EDT Rohan Bernett wrote:

>I know the IORs of water and glass are 1.33 and 1.5, but there are a number
>of materials that it would be handy to know the IORs for.
>
>Perspex
>PET (plastic, recycling number 1)
>Pyrex
>Quartz glass
>
>If anyone can give the IORs of these substances (and any others) please
>reply to this message with them.

  The following are in the docs, section 7.4.6:

Air_Ior = 1.000292 
Amethyst_Ior = 1.550 
Apatite_Ior = 1.635 
Aquamarine_Ior = 1.575 
Beryl_Ior = 1.575 
Citrine_Ior = 1.550 
Crown_Glass_Ior = 1.51 
Corundum_Ior = 1.765 
Diamond_Ior = 2.47 
Emerald_Ior = 1.575 
Flint_Glass_Ior = 1.71 
Flint_Glass_Heavy_Ior = 1.8 
Flint_Glass_Medium_Ior = 1.63 
Flint_Glass_Light_Ior = 1.6 
Fluorite_Ior = 1.434 
Gypsum_Ior = 1.525 
Ice_Ior = 1.31 
Plexiglas_Ior = 1.5 
Quartz_Ior = 1.550 
Quartz_Glass_Ior = 1.458 
Ruby_Ior = 1.765 
Salt_Ior = 1.544 
Sapphire_Ior = 1.765 
Topaz_Ior = 1.620 
Tourmaline_Ior = 1.650 
Water_Ior = 1.33

  Rather than copy and paste, here's the .url for one chart I found
using Google:

http://hokum.freehomepage.com/Content/Reference/Ref_Refract.html

-- 
Alan
ako### [at] povrayorg
a k o n g <at> p o v r a y <dot> o r g

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