Trevor Quayle wrote:
> 
> From an ior include file I found once (I forget where):
> 
> #declare Sapphire_IOR = (1.76 + 1.78) / 2; // A variety of Corundum
> #declare Sapphire_IOR_Dispersion = 1.76 / 1.78;
> 
> As Chris stated, your dispersion is way too high, this number represents the
> ratio of violet/red  IORs for the material. (The numbers in the declare
> above may be inverted.  I can't remember anything from physics about
> wavelengths and such. Anyone else?)
> 

The different ior's mentioned above are mainly due to anisotropy of
sapphire (like many other crystals)

Correct dispersion values can be calculated with:

http://www.luxpop.net/

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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