> The relavent POV code is below.  Does anything look awry?
>    media {
>       intervals 15  //more needed? -> 100
>       //ratio 0.5
>       samples 2,6
>       method 3

Well, there are three methods for media. I don't know anything about method
1, since POV 3.5 I've just been using methods 2 and 3 (mainly method 3).
With method 2, you want to use an amount of intervals which return
sufficient results, and have to take care that "samples" uses the same value
for min and max, otherwise, the result might look grainy.
With method 3, you want to use only one interval, but varying values for min
and max for "samples". I'd try method 2 for this volume first though.

Now, given the amount of data in your volume, I'd say that you're using way
too few intervals. What might happen is that when the ray travels through a
dense region, it might sample before and after the bright region. Since
those two samples are nearly identical, the adaptive-algorithm assumes that
between those two samples no significant changes occur, and hence, the
bright spot is lost.

Another note regarding your clipping-theory: when colors get clipped in
POV-Ray, they get clipped to an upper or lower boundary, I've never heard of
values getting clipped via some modulo function (e.g. when clipping between
0 and 1, 1.2 would turn out as 0.2).

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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