but so far I don't have an easy way to combine models into one
> modeling array that would allow for sharp corners.

Mmmm, what about weighting the knots? for maximum smoothness than handles shoud
be equally long and have the exact opposite direction. Lets call that a weight
of 1.

Weight of 0 could be handle length 0.0. other weights are interpolation of the
two extrema.

This scheme is not exact, for example, it does not account for asymmetric
handles, but it could be a starting point for tinkering.

With a modeller, no idea if it is not build in.

ingo

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