3 \page uniting_set_of_triangles_page Uniting a set of triangles
5 \n It is possible to unite many neighboring triangles into
6 quadrangles by deletion of the common edge.
8 <em>To union several triangles:</em>
10 <li>Select a mesh (and display it in the 3D Viewer if you are going to
11 pick elements by mouse).</li>
12 <li>In the \b Modification menu select the <b>Union of triangles</b>
13 item or click <em>"Union of triangles"</em> button in the tool-bar.
15 \image html image80.png
16 <center><em>"Union of triangles" button</em></center>
18 The following dialog box will appear:
20 \image html a-unionoftriangles.png
23 <li><b>The main list</b> shall contain the triangles which will be
24 united. You can click on a triangle in the 3D viewer and it will be
25 highlighted. After that click the \b Add button and the ID of this
26 triangle will be added to the list. To remove a selected element or
27 elements from the list click the \b Remove button. The \b Sort button allows
28 to sort the list of IDs. The <b>Filter</b> button allows to apply a
29 definite \ref filtering_elements "filter" to selection of triangles.</li>
30 <li><b>Apply to all</b> radio button allows to apply the operation to
31 all triangles of the selected mesh.</li>
32 <li><b>Preview</b> provides a preview in the viewer.</li>
33 <li>\b Criterion menu allows to choose a quality criterion,
34 which will be optimized to select triangles to unite.</li>
35 <li><b>Select from</b> set of fields allows to choose a sub-mesh or an
36 existing group whose triangle elements then can be added to the
41 <li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
44 If some selected triangle elements have no adjacent edges with one of
45 the others, the operation on these elements shall take no effect.
47 \image html uniting_a_set_of_triangles1.png "The chosen triangles"
49 \image html uniting_a_set_of_triangles2.png "The union of several triangles - several quadrangular cells are created"
51 <br><b>See Also</b> a sample TUI Script of a
52 \ref tui_uniting_set_of_triangles "Uniting a Set of Triangles" operation.