[Gmsh] ?==?utf-8?q? Forcing all jacobians to be positive

Zuheyr Alsalihi alsalihi at vki.ac.be
Sun May 31 15:10:35 CEST 2020

Dear Christophe,  colleagues,

Recently there was a question about identifying different patches of am STL 3D surface mesh, and get the list
of elements on that particular surface.

I face the same problem. I created the bounding boxes or cylinders, GMSH objects, of the surfaces of interest to me, (see the figure attached for my geometry and the bounding cylinder object
Cylinder(8) = {3.05, 3.05, 5.02, 0.1, 0.1, 0, 0.060, 2*Pi};).

Can I use boolean operations somehow to find the intersection of these 2 surfaces? Or any other clever solution? I think general computational geometry methods would be overkill.

Many thanks for reading!

Best wishes,
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