Nathan Kopp wrote:
> 
> It's possible.  The speedup works like this:
> 

No, I don't think this is the culprit. The same happens with both constant and
non-constant densities, emitting, absorbing and scattering media. The media is
opaque to both camera and shadow rays. I'm beginning to think that the adaptive
mechanism is broken somehow.

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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