c=MEDCouplingCMesh("mesh")
c.setCoords(arr,arr,arr)
m=c.buildUnstructured()
-mbis=m.deepCpy() ; mbis.translate([5,0,0]) ; mbis.tetrahedrize(PLANAR_FACE_5)
+mbis=m.deepCopy() ; mbis.translate([5,0,0]) ; mbis.tetrahedrize(PLANAR_FACE_5)
m=MEDCouplingUMesh.MergeUMeshes([mbis,m]) ; m.setName(c.getName())
mm=MEDFileUMesh()
mm.setMeshAtLevel(0,m)