What I'm also thinking here, is that if we can just map a multi-segment
centripetal Catmull-Rom spline onto whatever other spline that we want to
implement as a sphere_sweep, then we can just use the bounding cylinders that
I'm working on to bound each segment of the sphere_sweep.

I'm not sure what would happen if we try to do that with a spline that has cusps
or self-intersections - I guess it would just render like any other union {} of
objects.

In any event, it's worth a try.

- BE

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