VTK reader does not map the nodes
The VTK reader does not make use of the mapping between the Gmsh native’s ordering and the VTK ordering, say MTetrahedron.h:283
for tet10.
The attached VTK, which was created by converting a .msh
to .vtk
was read back by Gmsh and the ordering is wrong. The VTK can be read fine with Paraview, so the problem is only in reading and not in writing VTK.