Curve tangent to 2 circles

What is the method for drawing a curve (G0) tangent to 2 circles of any size? Thanks in advance and for such a basic? —Mark

http://docs.mcneel.com/rhino/5/help/en-us/commands/line.htm

In far down there’s section on tangent on two curves.

I saw that . It works and thanks . I think it may only work if planer.

Doesnt seem to work on non-planer curves.which is understandable of the complexity. Thanks Mark

To create a “tangent” curve between two non-planar curves, use BlendCrv. BTW, tangent continuity is G1. G0 is just position continuity.

–Mitch

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Thanks for keeping me on track. —Mark