+++ /dev/null
-/*!
-
-\page cutting_quadrangles_page Cutting quadrangles
-
-This operation allows cutting one or several quadrangle elements into two or four triangles.
-
-<em>To cut quadrangles:</em>
-
-1) Select a mesh (and display it in the 3D Viewer if you are going to pick elements by mouse).
-
-2) In the \b Modification menu select the <b>Cutting of quadrangles</b> item or
-click <em>"Cutting of quadrangles"</em> button in the toolbar.
-
-\image html image82.png
-<center><em>"Cutting of quadrangles" button</em></center>
-
-The following dialog box will appear:
-
-\image html a-cuttingofquadrangles.png
-
-
-- 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 \b 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 \b Remove button.
- - <b>Sort list</b> button allows sorting the list of IDs.
- - \b Filter button allows applying a definite \ref filtering_elements "filter"
- to the selection of quadrangles.
-- <b>Apply to all</b> check box allows cutting all quadrangles of the selected mesh.
-- \b Preview provides a preview of cutting in the viewer. It is disabled for <b>Cut into 4 triangles</b> as this cutting way implies no ambiguity.
-- \b Criterion defines the way of cutting:
- - <b>Cut into 4 triangles</b> 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.
- - <b>Use diagonal 1-3</b> and <b>Use diagonal 2-4</b> allow specifying the opposite corners, which will be connected to form two new triangles.
- - <b>Use numeric functor</b> allows selecting in the field below a quality metric, which will be optimized when choosing a diagonal for cutting a quadrangle:
- - <b>Minimum diagonal</b> cuts by the shortest diagonal.
- - <b>Aspect Ratio</b> cuts by the diagonal splitting the quadrangle into triangles with \ref aspect_ratio_page "Aspect Ratio" closer to 1
- - <b>Minimum Angle</b> cuts by the diagonal splitting the quadrangle into triangles with \ref minimum_angle_page "Minimum Angle" closer to 60 degrees.
- - <b>Skew</b> cuts by the diagonal splitting the quadrangle into triangles with \ref skew_page "Skew" closer to 0.0 degrees.
-- <b>Select from</b> allows choosing a sub-mesh or an existing group, whose quadrangle elements then can be added to the main list.
-
-3) Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.
-
-\image html image52.jpg "The chosen quadrangular element"
-
-\image html image51.jpg "Two resulting triangular elements"
-
-<br><b>See Also</b> a sample TUI Script of a
-\ref tui_cutting_quadrangles "Cutting Quadrangles" operation.
-
-*/
