Not sure what you're trying to do exactly, but let's see:

> i) For every PNG I am working with, create a different povray  file where
> the PNG is referenced and used.

	You might have a unique scene.pov file that uses an imgfile variable
which is initialized at the command-line:
http://povray.org/documentation/view/3.6.1/220/

	Thus, for your bunch of PNG image files, do e.g.:

#!/bin/sh
for file in `ls *.png`; do
   povray scene.pov [options] Declare=imgfile=$file
done

	- NC

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