Thank you Michael.

I'll do some tests.

I guess that the "curve's parameter space" has to do with the NURBS representation?

- Brian

Using cPlane at the centerpoint, I'm intersecting the "waist" of an extruded (or lofted) pair of circles, (an oblique cylinder), with
a plane, which is a "belt" ellipse. (Like a person with a belt around the waist.)
The ellipse formed often has a different start point than the starting cylinder. I'm trying to move the start point to match the cylinder seam.
It is easy interactively, with a specific cylinder...

Hi Brian,

> I guess that the "curve's parameter space" has to do with the NURBS representation?

Yup, there is a range of numbers called the "knot vector" which sets a minimum and maximum value for the parameter space range. Evaluating the curve at the start parameter yields the start point of the curve, evaluating the curve at the end parameter gives the end point of the curve.

- Michael