I have worked out the large majority of what needs to be done to get 16 points
to sit directly ON an array of 9 bicubic_patches, or rather, have smoothly
contoured patches align with the data.

At this juncture, I can't seem to be able to get the edges of the bezier patches
to stay aligned with one another, no matter what I do.   Blind brute-force
defining all four edge points did not seem to work, and even seemed to make
things worse.   Which means I've probably looked at the code for too long and
I'm probably mentally overlooking, filtering, or wrongly thinking or assuming
something.

If someone could look over what I've got and see if there's anything that's
obviously wrong, that would be great.   I'd like to get this working and have it
be a robust tool that can be adapted, used, and improved upon.

Also, if anyone can explain how to get the inside_texture to point downward
along -y in a way that does not involve rotating the patch(es) around x or z by
180 degrees, that would be very helpful.

Thanks!

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