I have a question.  And please bear in mind that my maths is not the 
best.

How do you get a solution if all three points are in a perfectly straight 
line, e.g.:
<0,0,0>, <1,0,0>, <2,0,0>

Apart from using the limited accuracy of numerical values in POV, how do 
you draw a circle such that its circumference passes through all three 
points?

Or am I misunderstaning the original question?

Bye for now,
     Jamie.

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