> I am making some spline related macros - to learn and to use (and for
> fun...), and up to a point things went smoothly.
>
> No problems with linear splines or quadratic splines, even bezier splines
> went fine... but the cubic spline has me stunted.

Does it ever happen to you, that the minute you ask for help you stumble
upon a solution by accident?

:) I did. Found what I needed to see in the Spilineditor's web-page: the
tangent at P1 is parallel to the line connecting P0 and P2.

Happy me,

  -- Nikodemus

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