> > Thus, better and better approximations would tend to a more and more 
> > opaque object which take longer and longer to render. I'd say; skip 
> > the transparency. :)
> 
> Um, with better approximations, the volume the ray passes through will 
> decrease, and the sponge will become more and more *transparent*. You 
> will get a fainter and fainter image of the sponge, until it is 
> invisible. But as I said above, I'm only interested in an approximation, 
> maybe 3-5 levels...a real sponge would be impossible.

I'd have thought that would depend on the material being used to make 
said sponge?  With a transparent but reflective material, surely internal 
reflections would build up to the point where they would overpower and 
obscure any view through the sponge?

I could be wrong though...

Bye for now,
     Jamie.

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