"Bald Eagle" <cre### [at] netscapenet> wrote:

> So A through D have something to do with the spline segments.
> I just don't "see" where they come from or what their exact meaning is.
> Perhaps somewhere else farther upstream in the code is a place where the control
> points get grouped in sets of 4, and so A through D would be sets of control
> points.

And this is the challenge of trying to do this piecemeal, in fits and starts
during random available 15 min opportunistic time slots.

Just a few lines above that is:

/* Step through the list of intersections. */

    for (j = 0; j < cnt; j++)
    {
        /* Get current segment. */

        Entry = &Spline->Entry[intervals[j].n];

and I'm kinda guessing that intervals comes from insert_hit in
https://github.com/POV-Ray/povray/blob/master/source/core/bounding/boundingcylinder.cpp

So that's my current working theory.

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