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50 lines
2.0 KiB
ReStructuredText
50 lines
2.0 KiB
ReStructuredText
.. _uniting_set_of_triangles_page:
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**************************
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Uniting a set of triangles
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**************************
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It is possible to unite many neighboring triangles into
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quadrangles by deletion of the common edge.
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*To union several triangles:*
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.. |img| image:: ../images/image80.png
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#. Select a mesh (and display it in the 3D Viewer if you are going to pick elements by mouse).
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#. In the **Modification** menu select the **Union of triangles** item or click *"Union of triangles"* button |img| in the tool-bar.
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The following dialog box will appear:
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.. image:: ../images/a-unionoftriangles.png
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:align: center
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* **The main list** shall contain the triangles which will be united. You can click on a triangle in the 3D viewer and it will be highlighted. After that click the **Add** button and the ID of this triangle will be added to the list. To remove a selected element or elements from the list click the **Remove** button. The **Sort** button allows to sort the list of IDs. The **Filter** button allows to apply a definite :ref:`filter <filtering_elements>` to selection of triangles.
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* **Apply to all** radio button allows to apply the operation to all triangles of the selected mesh.
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* **Preview** provides a preview in the viewer.
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* **Criterion** menu allows to choose a quality criterion, which will be optimized to select triangles to unite.
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* **Select from** set of fields allows to choose a sub-mesh or an existing group whose triangle elements then can be added to the list.
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#. Click the **Apply** or **Apply and Close** button to confirm the operation.
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If some selected triangle elements have no adjacent edges with one of
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the others, the operation on these elements shall take no effect.
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.. image:: ../images/uniting_a_set_of_triangles1.png
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:align: center
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.. centered::
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The chosen triangles
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.. image:: ../images/uniting_a_set_of_triangles2.png
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:align: center
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.. centered::
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The union of several triangles - several quadrangular cells are created
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**See Also** a sample TUI Script of a
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:ref:`tui_uniting_set_of_triangles` operation.
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