I'm just figuring about splines a little bit. I encountered a representation
with points at the curve and two control points for each such point. This
"control points" are obviously in the gradient direction (plus/minus) of the
spline but they can have different lengths. And they influence the original

www.nolimitscoaster.com and you will see what I mean. I have not found the
mathematical representation of this parametrisation. Did someone have a hint?

Best regards,
Michael

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