Problems with Sweep 1 Rail. Bug?

Rhino Rhino for Windows
1

I’m getting a result with Sweep Rail that I didn’t expect. Is there a solution please?

Here is my rail which is made up of a single polyline. At each end is a circle. One end’s circle is larger than the other.

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What I want is a single cone that snakes its way from one end of the rail to the other, but what I get are three cones. That doesn’t happen if the polyline are curvy instead of angled.

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2

BTW, I should add that I can’t even trim the objects to get the desired shape.

3

Apologies. Answer was to choose ‘untrimmed mitres’.

4

Yeah, trimmed miters on tapered and especially non-planar paths is rarely going to work.

-P