I have looked into doing some 4D projections into 3D space, but alas, the math
for the moment evades me.

With regard to constant-perceived-width objects, specifically in the present
case of planetary and satellite orbits, the projection of a torus would be a
useful little object to be able to have on-hand.

http://mathforum.org/mathimages/index.php/Projection_of_a_Torus

I'm envisioning 3 parameters for this:  major radius, and 2 minor radii - the
max and the min.

Thanks to anyone taking an interest!  :)

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