[Gmsh] building 3D mesh from 2D surfaces

[RENARD Francois]

Hello,

I'm trying to build a 3D mesh from two separate 2D surfaces but without 
success.

I've tryed the very simple joined geometry, with two plane surfaces 
joined by lines, but the 3D mesh result is awful, with lot of warnings :

Warning : Could not orient normal of surface 10
Warning : Could not orient normal of surface 12
Warning : Could not orient normal of surface 13
...

(see gmsh3d.log)

I don't understand what can be wrong and would be interested in having 
some help to resolve this problem.

The goal is to deal with more complex (no plane) surfaces...

Thank you,

François
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