[Gmsh] Coherence Mesh on mirrored mesh

[vincent doyeux]

Hi,
I am trying to build a mesh by pasting together two meshes.
The first mesh is a simple cube for this example.
I created the second mesh, by performing a "mirror" of the first mesh. To
do so, I read the first mesh file and directly change the node coordinates.
Thus, I expect the connectivity to be kept the same.

I want to paste the two meshes which are necessarily matching by a face.

To paste the meshes I use (merging.geo):

Merge "mesh1.msh";
Merge "mesh2.msh";
Geometry.Tolerance=1e-05;
Coherence Mesh;

The resulting mesh looks ok but is actually wrong. For example, if I
partition the resulting mesh, I can see that the connectivity is not read
properly.

Do you have any idea of what I am doing wrong?

I joined simplified meshes I used and pictures of the partitions I get.

Best,
Vincent
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