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That's a fascinating series of tests and code-fix changes you've come up with.
When I used to run the 'abyss.pov' file in v3.6.2 days, I too noticed that it
didn't look 'correct', in some hard-to-grasp way. (Not that the scene itself is
the problem; it's a beauty, regardless of any undelying problems or
media-interaction strangness.) At the time, I attempted to finesse some of the
scene values, but was never happy with my own results.
Over and above your technical/artistic fixes, I'm wondering which render version
Gilles himself would prefer-- the original, or your nicely murky and darker
final render. Of course, he made the scene based on the behavior of POV-Ray at
the time-- warts and all. ;-) But I wonder if an older render represents the
'look' he wanted to achieve-- OR, if that look was based on limitations that he
couldn't work around.
In any case, thanks for taking to time to delve into that complex scene--
especially regarding light/media interaction-- and for coming up with the
proposed fixes. That scene is a real showcase for POV-Ray.
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