\page cutting_quadrangles_page Cutting quadrangles
-\n This operation allows cutting one or several quadrangle elements
-into two or four triangles.
+This operation allows cutting one or several quadrangle elements into two or four triangles.
<em>To cut quadrangles:</em>
-<ol>
-<li>Display a mesh, a 2D sub-mesh or a group of faces in the 3D viewer.</li>
-<li>In the \b Modification menu select the <b>Cutting of quadrangles</b> item or
+
+1) Display a mesh, a 2D sub-mesh or a group of faces in the 3D viewer.
+
+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
\image html a-cuttingofquadrangles.png
-<ul>
-<li>The main list contains the list of quadrangles selected for cutting. You can
- click on an 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 to sort the
- list of IDs. \b Filter button allows to apply a definite filter to the selection of
- quadrangles.</li>
-<li><b>Apply to all</b> check box allows to cut all quadrangles of the selected mesh,
- sub-mesh or group.</li>
-<li>\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.</li>
-</ul>
-
-<ul>
-<li>\b Criterion defines a cutting way.
-<ul>
-<li><b>Cut into 4 triangles</b> selects cutting the quadrangle into four triangles by
- inserting a new node at the center of quadrangle. The other options selects cutting
- the quadrangle into two triangles by connecting nodes of either of the two diagonals.
-<li><b>Use diagonal 1-3</b> and <b>Use diagonal 2-4</b> allows to specify the
- opposite corners which will be connected to form two new triangles.</li>
-<li><b>Use numeric functor</b> allows to choose a quality metric which will be
- optimized when choosing a diagonal for cutting a quadrangle.
- <ul>
- <li><b>Minimum diagonal</b> cuts by the shortest diagonal.</li>
- <li><b>Aspect Ratio</b> cuts by the diagonal splitting the quadrangle into
- triangles with \ref aspect_ratio_page "Aspect Ratio" closer to 1.</li>
- <li><b>Minimum Angle</b> cuts by the diagonal splitting the quadrangle into
- triangles with \ref minimum_angle_page "Minimum Angle" closer to 60
- degrees.</li>
- <li><b>Skew</b> cuts by the diagonal splitting the quadrangle into triangles
- with \ref skew_page "Skew" closer to 0.0 degrees.</li>
- </ul>
-</li>
-</ul>
-</li>
-<li><b>Select from</b> allows to choose a sub-mesh or an existing group whose
- quadrangle elements will be automatically added to the main list.</li>
-</ul>
-</li>
-<li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
-</ol>
+- 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 filter to the selection of quadrangles.
+- <b>Apply to all</b> check box allows cutting all quadrangles of the selected mesh, sub-mesh or group.
+- \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 will be automatically 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"
