Does anyone know of a source for existing code or macros for performing
geometric tasks that are likely to crop up while modeling things in 3d?

Circumscribing a circle around a triangle, finding the center of a sphere that
includes that circle in its surface, finding a circle that is tangent to 3 other
circles, etc.

No doubt, I could code a few such algebraic solutions to geometric problems, but
why reinvent the wheel, and there might be methods out there that use POV-Ray's
bounding boxes and other features to speed up the process...

Thanks!

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