Am 02.09.2016 um 08:39 schrieb scott:
>>> 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 :-)

Or that, yes.

(And would that then be a naive interpolation of a data array, or maybe
a spherical harmonics-based approximation?)

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