Thank you, that code was exactly what I've been looking for.

I know that I'm not so good at using the POV-Ray Help, but one reason might
be that I don't always find the correct keywords for searching because I
originally speak German. "Picture" would probably have been a great keyword
to use but when thinking of a keyword my brain sowehow blocked and I decided
to use the tree structure where I probably was mislead by some expressions I
understood wrong at first sight...

Thank you all for your quick responses!

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