[Gmsh] detect negative jacobians

[Bernd Hahnebach]

Hi GMSH users and developers,

Is it possible to check a mesh in gmsh in the regard of negative  
jacobians? If yes, is it possible to show such elements in gmsh gui?  
Attached a mesh wich has negative jacobians to test with.

mesh: Shape_mesh_negative_jacobian.unv.zip (remove .zip)
http://forum.freecadweb.org/download/file.php?id=21583&sid=a7b68cea7fa02126487316248b875c2d


What is the recommended way to avoid such negative jacobians? Attached  
the geometry of the mesh above.

geometry: Shape.brep
http://forum.freecadweb.org/download/file.php?id=21588


kind regards bernd