>> If you can post a graph of the BRDF that you're trying to simulate for the
>> purposes of your sampling algorithm, or a means of plotting it themselves, then
>> that might give anyone following along a nudge forward.
>
> I can't. That's the crux of the matter: The algorithm needs to cope with
> varying BRDFs. It might be Lambertian with a Phong highlight, or
> Oren-Nayar with a Blinn-Phong highlight, or (in the future) maybe
> Cook-Torrance, He-Torrance, Ward, Schlick, Lafortune, or whatever smart
> brains may still come up with and someone decides to implement in POV-Ray.

...or a BRDF created by interpolating real-life measurement data :-)

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