<em>To union several triangles:</em>
<ol>
-<li>Display a mesh or a submesh in the 3D viewer.</li>
+<li>Display a mesh or a sub-mesh in the 3D viewer.</li>
<li>In the \b Modification menu select the <b>Union of triangles</b>
item or click <em>"Union of triangles"</em> button in the toolbar.
-\image html image80.gif
+\image html image80.png
<center><em>"Union of triangles" button</em></center>
The following dialog box will appear:
to sort the list of IDs. The <b>Set filter</b> button allows to apply a
definite filter to selection of triangles.</li>
<li><b>Apply to all</b> radio button allows to modify connectivity and
-type of all triangles of the currently displayed mesh or submesh.</li>
-<li>\b Criterion menu allows to apply the operation only to those
-object which meet the chosen criterion (from the list of Quality
-Controls, i.e. Skew, Warping, Minimum Angle, etc.)</li>
-<li><b>Select from</b> set of fields allows to choose a submesh or an
+type of all triangles of the currently displayed mesh or sub-mesh.</li>
+<li>\b Criterion menu allows to chose a quality criterion
+ optimization of which will be used to select triangles to unite.</li>
+<li><b>Select from</b> set of fields allows to choose a sub-mesh or an
existing group whose triangle elements will be automatically added to
the list.</li>
</ul>
</li>
-<li>Click the \b Apply or \b OK button to confirm the operation.</li>
+<li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
</ol>
If some selected triangle elements have no adjacent edges with one of
the others, the operation on these elements shall take no effect.
-\image html uniting_a_set_of_triangles1.png
+\image html uniting_a_set_of_triangles1.png "The chosen triangles"
-\image html uniting_a_set_of_triangles2.png
+\image html uniting_a_set_of_triangles2.png "The union of several triangles - several quadrangular cells are created"
<br><b>See Also</b> a sample TUI Script of a
\ref tui_uniting_set_of_triangles "Uniting a Set of Triangles" operation.