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75 lines
2.6 KiB
Plaintext
75 lines
2.6 KiB
Plaintext
/*!
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\page cutting_quadrangles_page Cutting quadrangles
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\n This operation allows to cut one or several quadrangle elements by
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addition of a supplementary edge which will connect two opposite
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corners.
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<em>To cut quadrangles:</em>
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<ol>
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<li>Display a mesh or a sub-mesh 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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\par
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<ul>
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<li>The main list contains the list of quadrangles. You can click on
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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
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the ID of this quadrangle will be added to the list. To remove a
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selected element or elements from the list click \b Remove button. <b>Sort
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list</b> button allows to sort the list of IDs. \b Filter button allows to
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apply a definite filter to the selection of quadrangles.</li>
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<li><b>Apply to all</b> check box allows to modify the orientation of all
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quadrangles of the currently displayed mesh or sub-mesh.</li>
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<li>\b Preview - provides a preview of cutting in the viewer.</li>
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</ul>
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<ul>
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<li>\b Criterion
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<ul>
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<li><b>Use diagonal 1-3</b> and <b>Use diagonal 2-4</b> allows to
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specify the opposite corners which will be connected by the cutting
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edge.</li>
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<li><b>Use numeric factor</b> - allows to chose a quality criterion
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optimization of which will be used to select the cutting edge.
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<ul>
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<li><b>Minimum diagonal</b> - will be used the edge with the smallest length.</li>
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<li><b>Aspect Ratio</b> - will be used the edge which splits a quadrangle
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in order to optimize an Aspect Ratio quality criterion. The reference value is 1.</li>
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<li><b>Minimum Angle</b> - will be used the edge which splits a quadrangle
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in order to optimize a Minimum Angle quality criterion. The reference value
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is 60 degrees.</li>
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<li><b>Skew</b> - will be used the edge which splits a quadrangle
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in order to optimize a Skew quality criterion. The reference value
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is 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
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group whose quadrangle elements will be automatically added to the
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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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