clipka <ano### [at] anonymousorg> wrote:
> With metallic surfaces you do not have any scattering within the
> material - instead, any diffuse-style reflection is the result of
> repeated specular reflection at a very clustered surface. I wouldn't be
> surprised if this indeed results in quite different characteristics. My
> first guess, however, would be that those characteristics would be more
> faithfully modelled with a very rough specular highlight, rather than a
> high-brilliance diffuse term.

You may be right.  I just had a look at some diffuse metallic surfaces, and the
effect I attributed to brilliance depends on viewing angle.  That is highly
suggestive of a very broad highlight, rather than diffuse reflection.

Of course, to model this requires S+P > R, because for a diffuse surface, R = 0!
This requires more thought and experimentation.

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