>
> Well, the refraction would be at the material/object level, as part of the
> interior. Water is IOR ~1.3, glass, jade, and pearl are ~1.5, and diamond is
> ~2.4, not sure what ivory would be.

> Okay, I just found this extensive IOR listing with ivory at IOR 1.54:

http://interactagram.com/physics/optics/refraction/

Excellent! Just bookmarked it, thanks.

> Anyway, these are just textures that I defined as base SSLT-only textures.

That's a problem with using a modeller, I don't know these coding 
tricks. :-( I thought...

> I've noticed that the current SSLT implementation doesn't play well with complex
> pigments like color_maps or image_maps; it just seems to ignore them. So I've
> been experimenting with layered and patterned textures instead of just pure
> SSLT, getting results like these (with spec, roughness, etc in non-SSLT
> layers/patterns).
>

The Ketchup would make a good marble but I would not like to drink the 
wholemilk. ;-)

The settings I used for my ivory were:
IOR 1.5
colour rgbft <0.914,0.906,0.620,0.000,0.000>
ambient     rgb <0.100,0.100,0.0945>
subsurface { <3,3,2> * 
<0.914,0.906,0.620>,<0.914,0.906,0.620>*<0.914,0.906,0.620>/1000 }



-- 
Regards
     Stephen

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