> This is true and, as any experienced photographer knows, if in the 
> darkroom or
> Photoshop, you usually do. But as Ansel Adams discovered it always comes 
> out
> more natural looking to put the filter directly on the lens.

Which is why I mentioned that POV also allows you to put arbitrary objects 
in front of the virtual camera to simulate many lens effects.  Off the top 
of my head a polarising filter would be one of the few that is not possible 
to simulate.  I don't get what this has to do with assumed_gamma though, 
which lens IRL are you trying to simulate by toying with assumed_gamma?

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