Hi Nick,
> I tried with a 20" dia circle and it made 60 points
> (did Moi decide how many points)?
What happens there is a circle is what is called a "rational" curve (that's what gives the R in NURBS), which means in addition to x,y,z values for control points there is also a weight value for each control point as well. These weight values are what allow a NURBS curve to exactly represent conic sections like a circle or ellipse.
The AI format does not have any ability in it to have weight values, it can only contain "non-rational" bezier curves in it.
So if you have a rational curve, when you export to AI format it will get refit into a non-rational spline using a tolerance based refinement mechanism.
- Michael
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