/*!

\page uniting_two_triangles_page Uniting two triangles

\n In MESH you can union two neighboring triangles (cells) by deletion
of the common edge.

<em>To unite two triangles:</em>
<ol>
<li>From the \b Modification menu choose the <b>Union of two
triangles</b> item or click <em>"Union of two triangles"</em> button
in the toolbar.

\image html image71.png
<center><em>"Union of two triangles" button</em></center>

The following dialog box shall appear:

\image html unionoftwotriangles.png

</li>
<li>Enter IDs of nodes forming the required edge in the \b Edge field
  (the node IDs must be separated by a dash) or select this edge in
  the 3D viewer.</li>
<li>Click the \b Apply or <b>Apply and Close</b> button.</li>
</ol>

\image html uniting_two_triangles1.png "The selected triangles"

\image html uniting_two_triangles2.png "The union of two triangles" 

<br><b>See Also</b> a sample TUI Script of a 
\ref tui_uniting_two_triangles "Uniting Two Triangles" operation.  

*/