I have a closed mesh2 surface (roughly spherical), clipped by a plane. Viewed
from a bit below the clipping plane, it looks sort of like an open hemisphere.

I would like to make a (CSG-like) solid band, or tube/pipe/cylinder, that runs
along the *edge* where the plane and the mesh2 intersect.

I've been able to get the slab corresponding to the opening (intersection with a
very thin box and the mesh2), and a plane-like slab with the opening hole
cut-out (difference), but I cannot get just the edge (with some thickness, so
you can see it!).

Suggestions? Thanks!
David

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