1 .. _diagonal_inversion_of_elements_page:
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4 Diagonal inversion of two triangles
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7 In MESH you can inverse the diagonal (edge) of a pseudo-quadrangle
8 formed by two neighboring triangles with one common edge.
10 **To inverse the diagonal:**
12 #. From the **Modification** menu choose the **Diagonal inversion** item or click **"Diagonal Inversion"** button in the toolbar.
14 .. image:: ../images/image70.png
18 **"Diagonal Inversion" button**
20 The following dialog box shall appear:
22 .. image:: ../images/diagonalinversion.png
25 #. Enter IDs of nodes forming the required edge in the **Edge** field (the node IDs must be separated by dashes) or select this edge in the 3D viewer.
26 #. Click the **Apply** or **Apply and Close** button.
28 .. image:: ../images/image38.jpg
34 .. image:: ../images/image36.jpg
40 **See Also** a sample TUI Script of a :ref:`tui_diagonal_inversion` operation.