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<title>Cutting quadrangles</title>
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<h1>Cutting quadrangles</h1>

<p><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs1"> This operation allows to cut one or several quadrangle 
 elements by addition of a supplementary edge which will connect two opposite 
 corners. </p>

<p>&nbsp;</p>

<p class=TODO>To cut quadrangles:</p>

<p class="whs2">&nbsp;</p>

<p class="whs2">1. Display a mesh or a submesh in the 3D 
 viewer.</p>

<p class="whs2">2. In the <span style="font-weight: bold;"><B>Modification 
 </B></span>menu select the <span style="font-weight: bold;"><B>Cutting of quadrangles 
 </B></span>item or click <img src="../image82.gif" width="25px" height="22px" border="0" class="img_whs3"> button in the toolbar. The following 
 dialog box will appear:</p>

<p>&nbsp;</p>

<p class="whs2"><img src="../pics/a-cuttingofquadrangles.png" x-maintain-ratio="TRUE" width="306px" height="525px" border="0" class="img_whs4"></p>

<p>&nbsp;</p>

<ul type="disc" class="whs5">
	
	<li class=kadov-p><p class="whs6"><span 
 style="font-weight: bold;"><B>The main list </B></span>shall contain the quadrangles 
 which will be cutted. You can click on an quadrangle in the 3D viewer 
 and it will be highlighted. After that click the <span style="font-weight: bold;"><B>Add 
 </B></span>button and the ID of this quadrangle will be added to the list. 
 To remove a selected element or elements from the list click the <span 
 style="font-weight: bold;"><B>Remove </B></span>button. The <span style="font-weight: bold;"><B>Sort 
 </B></span>button allows to sort the list of IDs. The <span style="font-weight: bold;"><B>F</B></span><span 
 style="font-weight: bold;"><B>ilter </B></span>button allows to apply a definite 
 filter to selection of quadrangles.</p></li>
	
	<li class=kadov-p><p class="whs6"><span 
 style="font-weight: bold;"><B>Apply to all </B></span>radio button allows to 
 modify the orientation of all quadrangles of the currently displayed mesh 
 or submesh.</p></li>
	
	<li class=kadov-p><p class="whs6"><span 
 style="font-weight: bold;"><B>Use diagonal 2-4 </B></span>radio button allows 
 to specify the opposite corners which will be connected by the cutting 
 edge.</p></li>
	
	<li class=kadov-p><p class="whs7">Preview 
 </p></li>
	
	<li class=kadov-p><p class="whs6"><span 
 style="font-weight: bold;"><B>Criterion</B></span> menu allows to apply the operation 
 only to those object which meet the chosen criterion (from the list of 
 Quality Controls, i.e. Skew, Warping, Minimum Angle, etc.)</p></li>
	
	<li class=kadov-p><p class="whs6"><span 
 style="font-weight: bold;"><B>Select from </B></span>set of fields allows to 
 choose a submesh or an existing group whose quadrangle elements will be 
 automatically added to the list.</p></li>
</ul>

<p class="whs2">&nbsp;</p>

<p class="whs2">3. Click the <span style="font-weight: bold;"><B>Apply 
 </B></span>or <span style="font-weight: bold;"><B>OK </B></span>button to confirm 
 the operation.</p>

<p class="whs2">&nbsp;</p>

<table x-use-null-cells cellspacing="0" width="100%" class="whs8">
<col class="whs9">
<col class="whs9">

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<p><img src="../image52.jpg" width="353px" height="300px" border="0" class="img_whs12"></td>
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<p><img src="../image51.jpg" width="353px" height="300px" border="0" class="img_whs12"></td></tr>
</table>

<p class="whs14">&nbsp;</p>

<p>&nbsp;&nbsp;<span style="font-weight: bold;"><B>See 
 Also</B></span> a sample TUI Script of a <a href="../modifying_meshes.htm#bookmark7">Cutting 
 Quadrangles</a> operation. &nbsp;</p>

<p>&nbsp;</p>

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