In article <MPG.1517399eed9bd1a989897@news.povray.org>, 
jam### [at] ntlworldcom (Jamie Davison) wrote:

> 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?

Well, I was specifically talking about transparent sponges, but I think 
that the cross-section area of the sponge will tend toward 0 as the 
surface area tends toward infinity, so a ray (or in the real world, a 
photon) wouldn't be able to hit a perfect sponge, and would just pass 
through it.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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