[Gmsh] Reversing normals on a surface, to change the node order in.msh file

Mark Starnes mark.starnes at fttech.co.uk
Wed Jun 17 15:00:28 CEST 2009

I answered my own question...  Editing .geo file, I changed the sign of
the surface number:  Importing the saved .msh file shows normals to
change direction.

Thanks anyway,


theOn Wed, 2009-06-17 at 13:52 +0100, Mark Starnes wrote:
> Hi everyone.  I posted this on Monday but on my client, it appeared
> nested under another topic...  I'll try again!
> I looked for the answer for this, but could only find references to
> reversing the normals displayed; not changing the order of the nodes for
> a surface element.
> My problem is I've a solver that uses node order to define the normal
> direction for a boundary element.  The mesh I'm creating is the result
> of an extrusion, and the surface elements generated are normal to the
> surface, but in the wrong direction (for me!).
> Can I click a surface and change it's orientation?
> Thanks for this great software!
> BR,
> Mark 
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