I have a spline which I which to simplify to a series of CSGed cylinders 
and boxes.

cylinder 1 is located at 0, 0 with major and minor axes of 2 and 1.4375
cylinder 2 is located at 0.5, 2.875 with maj./min. axes of 1.786, 1.03125

How do I find the endpoints of the tangent ascending from the left of 
the lower circle to the right of the upper circle?

(Also on this spline is needed a tangent descending from the left of the 
lower circle to intersect point -2.03125, 0.21875, the method of 
solution of which is probably related to the other problem)

-- 
Tim Cook

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