.. _uniting_two_triangles_page: ********************* Uniting two triangles ********************* In MESH you can union two neighboring triangles by deletion of the common edge. *To unite two triangles:* .. |img| image:: ../images/image71.png #. From the **Modification** menu choose the **Union of two triangles** item or click *"Union of two triangles"* button |img| in the tool-bar. The following dialog box shall appear: .. image:: ../images/unionoftwotriangles.png :align: center #. Enter IDs of nodes forming the required edge in the **Edge** field (a couple of node IDs separated by a dash) or select this edge in the 3D viewer. #. Click the **Apply** or **Apply and Close** button. .. image:: ../images/uniting_two_triangles1.png :align: center .. centered:: "The selected triangles" .. image:: ../images/uniting_two_triangles2.png :align: center .. centered:: "The union of two triangles" **See Also** a sample TUI Script of a :ref:`tui_uniting_two_triangles` operation.