In article <38D67E11.6FFFCF4A@gci.net>, "mr.art" <mr.### [at] gcinet> 
wrote:

> From the documents ( and I quote):
> 
> The phong and specular highlighting models ...

Ok, I thought you were talking about blurred reflection, which is not 
affected by ior.


> The model uses the fresnel reflectivity equation, which determines 
> reflectivity from the IOR (index of refraction) of the material.

Hmm, I wonder how much this differs from using fresnel type 
reflection(reflection_type 1, as I remember).

-- 
Christopher James Huff
Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg

Web page: http://chrishuff.dhs.org/

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