clipka <ano### [at] anonymousorg> wrote:

> 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.

Well, for now, you can - if there were a set of equations for the BRDF's that
could be easily plotted over the range 0-1 or 0-pi, then the shape might inspire
an equation to mimic them.   Presumably you already have a few such equations
working with POV-Ray, and some of the special development versions.

I've thought about this a bit and will have some more to say and ask, but for
now:

Is there a way to take the models available and fit a curve to them?
Polynomials, or Taylor series, or something like that?

And now I'm off to work.

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