TinCanMan is right, IMHO. About seven years ago I
made some "cat eye" marbles by putting colored glass
shapes in side a clear glass sphere. I would think the
marbled effect you are going for would be accomplished
by blobs or isosurface functions of varying tranparency.
Harold
"TinCanMan" <Tin### [at] hotmail com> wrote in message
news:3d0a6033@news.povray.org...
> Standard textures and materials are only applied to the surface of
objects.
> In order to create those ribbon patterns you are talking about you would
> either need to use media or use another object within the marble. I would
> suggest the latter (object in the marble) and try to create a suitable
> isosurface. That's about the extent of the help I can give for now. I'm
> sure someone else can help you with isosurfaces or whatever route you
decide
> to take.
>
> -tgq
>
>
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