"Dave Dunn" wrote:
> One thing I noticed in following this convoluted
> discussion is that the "additional" points at the
> beginning and end of the cubic spline are supposed
> to be (according to the docs) the third from the
> end for the first point and the third from the
> beginning for the last. I have never had any trouble
> using cubic splines (at least in prisms and lathes)
> using this method.

As pointed out before, the cubic spline in the spline{} feature is very
different from the cubic spline used in prisms and lathes. I am well capable
of closing a cubic spline in a prism or lathe, but to close the cubic spline
used in the spline{} feature is a completely different matter, which I have
not yet succeeded in (if it's possible at all).

Rune
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