Hello Mark,
Not sure about this, but the reverse all normal command could just be
post-processing. This would explain why it is not saved in you mesh file once
you update it. I would suggest using the Reverse Line { line_id } / Surface {
surface_id } / “*” command. What it does is reverse the node ordering within a
given line, surface, or globally. Since node ordering dictates normal
orientations, you should get what you want.
Additionally, there is to my knowledge no way of generating Physical Groups of
directly on meshes. Yet, I see two work-arounds. Solution one, is to re-process
your msh file outside of Gmsh. A msh file has a $PhysicalNames section that
you can add by hand to define your groups but then you would have to tag each
element belonging to the group individually in the $Element section. That could
work but that is certainly not practical, see documentation on MSH file
format<http://gmsh.info/doc/texinfo/gmsh.html#MSH-ASCII-file-format> for more
information.
Second possibility, have a look at STL remeshing example on the
wiki<https://onelab.info/svn/gmsh/trunk/tutorial/t13.geo> (user: gmsh,
password: gmsh). This could be a way to re-create a geometry based on your
mesh, apply the Physical group and finally re-save the geometry with the groups.
Hoping this was useful,
Guillaume Dilasser
De : gmsh [mailto:[email protected]] De la part de Mark
Smith
Envoyé : lundi 23 janvier 2017 16:52
À : [email protected]
Objet : [Gmsh] Reversing mesh normals
Hi Gmsh users,
I have a gmsh format mesh produced in pointwise which I load into gmsh. I wish
to reverse the direction of the surface normals on the mesh which I do by
options>mesh>color>Reverse all normal, if I set mesh.normals to some non zero
value the normal vector is displayed on the surface mesh and reverse all normal
does indeed reverse the vectors direction BUT if I save the mesh out to gmsh
msh format with the normals reversed then load it back into gmsh the normal
direction is the same as the original, am I doing something wrong or is what I
want to do not possible?
Also Is it possible to only reverse the normals on certain mesh surfaces rather
than all?
Is there a way to define Physical groups on a mesh rather than on Geometry if
one only has a mesh?
Thanks in advance
Best regards
Mark
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