--- /dev/null
+# Orientation
+
+import salome
+salome.salome_init_without_session()
+
+from salome.smesh import smeshBuilder
+
+smesh_builder = smeshBuilder.New()
+
+# create an empty mesh structure
+mesh = smesh_builder.Mesh()
+
+# build five quadrangles:
+dx = 10
+dy = 20
+
+n1 = mesh.AddNode(0.0 * dx, 0, 0)
+n2 = mesh.AddNode(1.0 * dx, 0, 0)
+n3 = mesh.AddNode(2.0 * dx, 0, 0)
+n4 = mesh.AddNode(3.0 * dx, 0, 0)
+n5 = mesh.AddNode(4.0 * dx, 0, 0)
+n6 = mesh.AddNode(5.0 * dx, 0, 0)
+n7 = mesh.AddNode(0.0 * dx, dy, 0)
+n8 = mesh.AddNode(1.0 * dx, dy, 0)
+n9 = mesh.AddNode(2.0 * dx, dy, 0)
+n10 = mesh.AddNode(3.0 * dx, dy, 0)
+n11 = mesh.AddNode(4.0 * dx, dy, 0)
+n12 = mesh.AddNode(5.0 * dx, dy, 0)
+
+f1 = mesh.AddFace([n1, n2, n8 , n7 ])
+f2 = mesh.AddFace([n2, n3, n9 , n8 ])
+f3 = mesh.AddFace([n3, n4, n10, n9 ])
+f4 = mesh.AddFace([n4, n5, n11, n10])
+f5 = mesh.AddFace([n5, n6, n12, n11])
+
+# Change the orientation of the second and the fourth faces.
+mesh.Reorient([2, 4])