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-.. _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.  
-
-