> I can't get the difference function to work. Any ideas?

I'm not sure what you're trying to achieve, but you do know that every box
after the first is being subtracted from the first, right? And since every
box after the the third has one edge at <0,0,-1>, you might as well just us
the the third box, because every one after that just tries to cut off a
section which is already cut off by the third.

Maybe you should experiment with difference and various shapes a little more
to get a feeling for what it does, that's what I had to do in the beginning
of my POV-career. :-)

Regards,
Tim

-- 
aka "Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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