1 .. _diagonal_inversion_of_elements_page:
3 ***********************************
4 Diagonal inversion of two triangles
5 ***********************************
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"* |img| button in the toolbar.
14 .. |img| image:: ../images/image70.png
16 The following dialog box shall appear:
18 .. image:: ../images/diagonalinversion.png
21 #. 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.
22 #. Click the **Apply** or **Apply and Close** button.
24 .. image:: ../images/image38.jpg
30 .. image:: ../images/image36.jpg
36 **See Also** a sample TUI Script of a :ref:`tui_diagonal_inversion` operation.