Am 22.12.2010 03:55, schrieb [GDS|Entropy]:

> 1a) It seems the povray params for these missing values should be an
> f(x); we have some data points already...is there a decent way to
> produce the governing function, so we could just write a program and
> dump the output?

The actual surface properties depend on:

[ambient] the ambient illumination, so no material property here at all;

[specular/roughness,phong/phong_size,reflection] the surface structure, 
which may vary on how the material was processed (e.g. polished, sanded, 
whatever); not a material property in that sense either; and while the 
parameters also depend on the IOR, this is already accounted for by the 
fresnel model, at least for reflections;

[diffuse] the IOR, but also a set of wavelength dependent parameters: An 
absorption coefficient, a scattering coefficient, and - if you want to 
do it really precise - a scattering distribution. From these you can 
even compute the material pigment (and model subsurface scattering 
besides), but without these you cannot even compute the diffuse parameter.

So sorry, but no banana here.

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