[Gmsh] problem with surface creation

[Alessandro Vicini]

With reference to the attached geo file, I’m trying to generate some conical surfaces using “surface filling”, for example for the surface bounded by circles 22 and 21; but I get the message “OpenCascade surface filling requires a single line loop”…
If I switch to the built-in geometry kernel (which I would like to avoid), I get another kind of error message (1 border instead of 3 or 4).
How can I work this out…? Thank you.

Alessandro

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