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74 lines
3.0 KiB
Plaintext
74 lines
3.0 KiB
Plaintext
/*!
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\page cutting_quadrangles_page Cutting quadrangles
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\n This operation allows cutting one or several quadrangle elements
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into two or four triangles.
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<em>To cut quadrangles:</em>
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<ol>
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<li>Display a mesh, a 2D sub-mesh or a group of faces in the 3D viewer.</li>
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<li>In the \b Modification menu select the <b>Cutting of quadrangles</b> item or
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click <em>"Cutting of quadrangles"</em> button in the toolbar.
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\image html image82.png
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<center><em>"Cutting of quadrangles" button</em></center>
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The following dialog box will appear:
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\image html a-cuttingofquadrangles.png
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<ul>
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<li>The main list contains the list of quadrangles selected for cutting. You can
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click on an quadrangle in the 3D viewer and it will be highlighted (lock Shift
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keyboard button to select several quadrangles). Click \b Add button and the ID of
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this quadrangle will be added to the list. To remove a selected element or elements
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from the list click \b Remove button. <b>Sort list</b> button allows to sort the
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list of IDs. \b Filter button allows to apply a definite filter to the selection of
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quadrangles.</li>
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<li><b>Apply to all</b> check box allows to cut all quadrangles of the selected mesh,
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sub-mesh or group.</li>
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<li>\b Preview provides a preview of cutting in the viewer. It is disabled for <b>Cut
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into 4 triangles</b> as this cutting way implies no ambiguity.</li>
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</ul>
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<ul>
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<li>\b Criterion defines a cutting way.
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<ul>
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<li><b>Cut into 4 triangles</b> selects cutting the quadrangle into four triangles by
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inserting a new node at the center of quadrangle. The other options selects cutting
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the quadrangle into two triangles by connecting nodes of either of the two diagonals.
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<li><b>Use diagonal 1-3</b> and <b>Use diagonal 2-4</b> allows to specify the
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opposite corners which will be connected to form two new triangles.</li>
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<li><b>Use numeric functor</b> allows to choose a quality metric which will be
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optimized when choosing a diagonal for cutting a quadrangle.
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<ul>
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<li><b>Minimum diagonal</b> cuts by the shortest diagonal.</li>
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<li><b>Aspect Ratio</b> cuts by the diagonal splitting the quadrangle into
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triangles with \ref aspect_ratio_page "Aspect Ratio" closer to 1.</li>
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<li><b>Minimum Angle</b> cuts by the diagonal splitting the quadrangle into
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triangles with \ref minimum_angle_page "Minimum Angle" closer to 60
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degrees.</li>
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<li><b>Skew</b> cuts by the diagonal splitting the quadrangle into triangles
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with \ref skew_page "Skew" closer to 0.0 degrees.</li>
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</ul>
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</li>
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</ul>
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</li>
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<li><b>Select from</b> allows to choose a sub-mesh or an existing group whose
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quadrangle elements will be automatically added to the main list.</li>
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</ul>
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</li>
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<li>Click the \b Apply or <b>Apply and Close</b> button to confirm the operation.</li>
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</ol>
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\image html image52.jpg "The chosen quadrangular element"
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\image html image51.jpg "Two resulting triangular elements"
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<br><b>See Also</b> a sample TUI Script of a
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\ref tui_cutting_quadrangles "Cutting Quadrangles" operation.
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*/
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