>
> 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.
>

Interesting thought!

I think you're right; it should be invisible.

:)

~simenkv.

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