That's certainly a problem I've seen before, though I suspect that's not it 
because I've already cranked the samples up pretty high. Having said that, 
the difference in size between the 2 containers is vast, so maybe even with 
a lot of samples they're still quite coarse in the overlapping area...

But you're right, if I up the number of samples I can tell if that's the 
problem... a few hours later when it finishes rendering... :)

-- 
Tek
http://evilsuperbrain.com

"Slime" <fak### [at] emailaddress> wrote in message 
news:43f548d2$1@news.povray.org...
>> The problem seems to simply be I have 2 different media-containers that
>> happen to overlap, it seems pov carves a hole out of one of them where it
>> finds the other.
>
> The problem, I believe, is that your sampling parameters aren't high 
> enough.
> POV-Ray isn't taking enough samples of the media, so you're getting
> incorrect results. When there's only one container, the result looks good
> enough that you don't have to worry about it - but when a ray passes 
> through
> two containers, the places the samples are taken change, so you get a
> *different* incorrect result.
>
> As you improve your sampling parameters ("samples n" where n is high 
> (start
> at 10 or so and work your way up)), the effect should diminish, but the
> render will also get slower.
>
> If you can put both medias into one container, you can eliminate the 
> problem
> that way - but you'll be sampling both medias everywhere, which will hurt
> performance.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>

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