Am 08.03.2013 17:53, schrieb Cousin Ricky:

> 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.

In POV-Ray practice, yes. Theoretically we'd still need S+P=R with R>0, 
albeit with a good deal of blur.

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