On Oct 12 2015 10:01 AM, Stuart Stevenson wrote:
>
> I think we should be able to probe coordinate rotations
>
> Two points for a plane rotation and three for a complete coordinate 
> system
> orientation

If you only probe 2, there are special collinear cases which could 
still be two of the three standard planes.  I think you have to choose 
three to definitively define even the the three standard ones (without 
having to worry about special cases.

   EBo --


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