mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
synced 2024-12-24 16:30:34 +05:00
58 lines
2.9 KiB
ReStructuredText
58 lines
2.9 KiB
ReStructuredText
.. _cutting_quadrangles_page:
|
|
|
|
*******************
|
|
Cutting quadrangles
|
|
*******************
|
|
|
|
This operation allows cutting one or several quadrangle elements into two or four triangles.
|
|
|
|
*To cut quadrangles:*
|
|
|
|
.. |img| image:: ../images/image82.png
|
|
|
|
#. Select a mesh (and display it in the 3D Viewer if you are going to pick elements by mouse).
|
|
#. In the **Modification** menu select the **Cutting of quadrangles** item or click *"Cutting of quadrangles"* button |img| in the toolbar.
|
|
|
|
The following dialog box will appear:
|
|
|
|
.. image:: ../images/a-cuttingofquadrangles.png
|
|
:align: center
|
|
|
|
|
|
* The main list contains the list of quadrangles selected for cutting. You can click on a quadrangle in the 3D viewer and it will be highlighted (lock Shift keyboard button to select several quadrangles):
|
|
* Click **Add** button and the ID of this quadrangle will be added to the list.
|
|
* To remove a selected element or elements from the list click **Remove** button.
|
|
* **Sort list** button allows sorting the list of IDs.
|
|
* **Filter** button allows applying a definite :ref:`filter <filtering_elements>` to the selection of quadrangles.
|
|
* **Apply to all** check box allows cutting all quadrangles of the selected mesh.
|
|
* **Preview** provides a preview of cutting in the viewer. It is disabled for **Cut into 4 triangles** as this cutting way implies no ambiguity.
|
|
* **Criterion** defines the way of cutting:
|
|
* **Cut into 4 triangles** allows cutting a quadrangle into four triangles by inserting a new node at the center of the quadrangle. The other options allow cutting a quadrangle into two triangles by connecting the nodes of a diagonal.
|
|
* **Use diagonal 1-3** and **Use diagonal 2-4** allow specifying the opposite corners, which will be connected to form two new triangles.
|
|
* **Use numeric functor** allows selecting in the field below a quality metric, which will be optimized when choosing a diagonal for cutting a quadrangle:
|
|
* **Minimum diagonal** cuts by the shortest diagonal.
|
|
* **Aspect Ratio** cuts by the diagonal splitting the quadrangle into triangles with :ref:`Aspect Ratio <aspect_ratio_page>` closer to 1
|
|
* **Minimum Angle** cuts by the diagonal splitting the quadrangle into triangles with :ref:`Minimum Angle <minimum_angle_page>` closer to 60 degrees.
|
|
* **Skew** cuts by the diagonal splitting the quadrangle into triangles with :ref:`Skew <skew_page>` closer to 0.0 degrees.
|
|
* **Select from** allows choosing a sub-mesh or an existing group, whose quadrangle elements then can be added to the main list.
|
|
|
|
#. Click the **Apply** or **Apply and Close** button to confirm the operation.
|
|
|
|
.. image:: ../images/image52.jpg
|
|
:align: center
|
|
|
|
.. centered::
|
|
The chosen quadrangular element
|
|
|
|
|
|
|
|
|
.. image:: ../images/image51.jpg
|
|
:align: center
|
|
|
|
.. centered::
|
|
Two resulting triangular elements
|
|
|
|
**See Also** a sample TUI Script of a :ref:`tui_cutting_quadrangles` operation.
|
|
|
|
|