William F Pokorny <ano### [at] anonymousorg> wrote:
.... how the internal cylinder bounding is being done. I

Check out Fig. 5, pg 11
https://www.cemyuksel.com/research/catmullrom_param/catmullrom_cad.pdf

We might have better luck if we changed how the bounding is done.
It also shows how I can create a set of control points where the curve
overshoots the control point polygon, and so I can use that to have the
interpolated curve cross over the rotation axis to see what happens.

I'll make a speculative prediction and say that the algorithm will try to take
the sqrt of that negative radius and fail - either throwing an error, or just
blanking out that portion of the curve - or the whole segment.

I'll probably have to convert most of the solver code to SDL and then use what I
get out of that to start to answer some other questions.

- BW

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