[Gmsh] node ordering for hexaedra order>=3

[Marie-Claire Le Pape]

Hello,

I apply the idea of Rui to find the node ordering in hexaedra of 1st and 
2nd order. But for greater orders it doesn't work.
To obtain gmsh files, I read the cube.geo file, then choose "3D" in the 
"mesh" menu, then "3" in the "setorder" menu, and I save the mesh. As 
you can see in the cube_order3 and 4.msh files, the order of the cube 
remains equal to 2.

Thanks for your answer.

Marie-Claire Le Pape
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