> If POV-Ray "sees" there's a file with post-process data, it can ask the
> user if he really wants to re-render or not.  Also, an "archival" mode 
> (POV-Ray
> gives an automatically numbered name to its output) would avoid any
> dangerous overwrite (and allow to easily keep a record of an image's 
> evolution,
> which is currently tedious).

That's just a GUI detail. Well, you *better* aren't thinking on adding 
"ask the user" to the rendering backend...

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