Try to analyze the sample scenes coming along with standard POV. Simply
manipulate them a bit and look what happens. Remember that you can
comment out the old code with "//". So it is easy to undo your
manipulation.
If you manipulate a certain instruction you can read the according
paragraph in the manual.
I know that might be hard, but it works. I hope you have a fast enough
computer for your testings ;-)

Karl

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