Alain <aze### [at] qwertyorg> wrote:
> There is no real need to use layered textures.
>
> You can apply a pattern to SSLT. You just need to use a texture_map. The
> pigment don't realy mather.
>
> box{-1 1 texture {agate texture_map{
> [0 finish{subsurface{<25, 24, 22>, <0.007, 0.008, 0.009> }]
> [1 finish{subsurface{<0.8, 0.3, 0.01>,<0.0021, 0.0025, 0.00946> } ]
>  }
>  scale 0.4
>  }
> interior{ior 1.43}
> }
>
> This gives an agate pattern that closely match the pigment.
>
> Alain

Thanks Alain, actually I've tried that approach and it's okay, but doesn't
really give the fine control over the look of the material that I want
artistically - those coefficients require too much hand-holding, trial & error,
and voodoo (for me anyway) to make them look "right."

With Christoph's new method of using pigments to color the scattering and
absorption it will be /so/ much easier to get a "right" result quickly. And
commenting out the subsurface component in a finish will (I assume) enable us to
do quick render tests of materials without waiting for all the subsurface
calculations. Which will also make it easy to render with-SSLT and without-SSLT
images for comparsion of the two techniques (as Christoph did with his ivory
die).

Cheers,
Rob

-------------------------------------------------
www.McGregorFineArt.com

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