Ben Paschke wrote:
> 
> check out -
> 
> http://www.aetec.ee/fv/vkhomep.nsf/pages/povman2
> 
Yes, POVMan could be used for simulating different surfaces without
recoding core POV-Ray, instead one could use Shading Language. This is
good for experimenting, and if there is dare need for speed, then one
can recode shader later in C into POV-Ray core.
"Advanced RenderMan" book contains example of Oren-Nayar BRDF, shaders
from this book could be downloaded in BMRT site:
http://www.bmrt.org/arman/materials.html
Look into file locillum.h, it contains Oren-Nayar model implementation
(along with Ward Larson's anisotropic model)

HTH

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