Thank you Samuel, this looks very good indeed. Over the weekend I ported the C
code mentioned here: http://paulbourke.net/geometry/2circle/ to a POV macro and
that does give me the same result. I might move to your way, was it is much more
POV like.

My first attempt at an animation is here:
http://legopov.blogspot.co.uk/

As mentioned, I am not sure the bottom part should move like that.

Thank you for your help,

Thomas

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