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orient face functions for triangular element

See merge request !314

ismail badia authored Mar 30, 2020 and Christophe Geuzaine committed Mar 30, 2020

(cherry picked from commit d54987d8)

Workflow:
- define occ geom, without meshing constraints
- sync
- set mesh size (in gmodel)
- resync : we would loose the mesh size spec since occ would tell us that lc = MAX_LC

Ok, so STLs in OCC are still somewhat unstable... Let's default to 0 and enable Geometry.OCCBoundsUseStl when necessary.

This is (unfortunately) much more accurate: even in simple cases
the bboxes of OCC shapes are otherwise not tight