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On Wed, 22 Dec 2010 02:52:59 -0500, clipka <ano### [at] anonymous org> wrote:
> 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.
Material was a poor choice for a word in relation to its meaning in SDL;
it just fit my mental picture of the data construct best at the time.
> So sorry, but no banana here.
Hmm...well, banana or no, there simply has to be a way to do this...people
either collectively or individually have solved more complicated problems
than this. I do not currently have enough understanding of all intrinsic
factors requisite to performing such a feat at this time, quite obviously.
:/
Ian
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