On 11-3-2013 9:15, scott wrote:
> Are there any limitations on the shape of A and B, or could they be
> anything?

They can be anything.

> I'm not sure exactly what you're trying (haven't analysed your code) but
> you can always translate to the origin, rotate, then translate back
> again to rotate around a specific axis.
>

In fact, as the code in p.b.s-f shows, I solved the problem to my 
satisfaction as further tests have shown me. Implementation is in a new 
Urbanism scene. Thanks for you comments though :-)

Thomas

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