So I cleaned up a few things,

made the native prism transparent to allow for further development
moved the small side and rotated view to the side, and widened the view
added a small region of black to each end of the color map to make things
clearer, esp in the case of small wrong-direction arcs
Put the image map at the back, labeled the gridlines...
switched over to orthographic camera

Saving that file as a backup and proceeding to try to model the original part
highlighted the need to consider the cases where adjacent circles are not
exterior to each other, and likely a need to include a proper _point_ where 2
linear segments can meet at a bend.

Also need to work out - or find - some code to keep most of the scene elements a
constant perceived size - like the line width, text size, etc when the camera
zoom is changed to switch between large and small dimension designs.


I made some progress on sorting out 0,1,2,3,4 tangent cases, and filtering the
code to bypass calculations for nonexistent tangent lines.

Hopefully I will have the time, energy, and focus to work through most of that
over the next several days.

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