Richard Dault wrote:
> 
[...]
> 
> isosurface {
>   function {
>     ball(x,y,z)
>     - crack(x,y,z)
>   }
[...]

That probably does not create what i would call a crack - a surface inside the
sphere where light is reflected and refracted.  

I would suggest two intersections between a sphere and an isosurface (the second
with sign -1) that are put together.

Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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