>The fresnel formulas play a role in metallic reflection too but the ior is
>much higher.  There are other specialities like the coloring of metallic
>surfaces depending on the angle of incidence.  See:
>
>http://www.oriel.com/down/pdf/12010.pdf
>http://www.fsz.bme.hu/~szirmay/brdf6_link.html
>http://web.pd.astro.it/pernechele/papers/4843-29.pdf

Thanks for the links.
Bye.

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