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165 lines
5.2 KiB
HTML
Executable File
165 lines
5.2 KiB
HTML
Executable File
<!doctype HTML public "-//W3C//DTD HTML 4.0 Frameset//EN">
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<html>
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<head>
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<title>Aspect Ratio</title>
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<meta http-equiv="content-type" content="text/html; charset=windows-1252">
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<meta name="generator" content="RoboHelp by eHelp Corporation www.ehelp.com">
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<link rel="stylesheet" href="../default_ns.css"><script type="text/javascript" language="JavaScript" title="WebHelpSplitCss">
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if (navigator.appName !="Netscape")
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{ document.write("<link rel='stylesheet' href='../default.css'>");}
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//-->
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</script>
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<style type="text/css">
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<!--
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img_whs1 { border:none; width:30px; height:30px; float:none; border-style:none; }
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ul.whs2 { list-style:disc; }
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p.whs3 { margin-left:80px; }
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img_whs4 { border:none; width:238px; height:205px; border-style:none; }
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<style type="text/css">
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div.WebHelpPopupMenu { position:absolute; left:0px; top:0px; z-index:4; visibility:hidden; }
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</style><script type="text/javascript" language="javascript1.2" src="../whmsg.js"></script>
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<script type="text/javascript" language="javascript" src="../whver.js"></script>
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<script type="text/javascript" language="javascript1.2" src="../whproxy.js"></script>
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<script type="text/javascript" language="javascript1.2" src="../whutils.js"></script>
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</head>
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<body><script type="text/javascript" language="javascript1.2">
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if (window.gbWhTopic)
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addTocInfo("MESH module\nQuality controls\nAspect ratio");
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</script>
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<h1>Aspect Ratio</h1>
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<p><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs1"> The <span style="font-weight: bold;"><B>Aspect Ratio</B></span>
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quality criterion for mesh elements is defined as follows:</p>
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<p> </p>
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<ul type="disc" class="whs2">
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<li class=kadov-p><p>For a <span style="font-weight: bold;"><B>triangle</B></span>
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2D element consisting of 3 nodes the <span style="font-weight: bold;"><B>Aspect
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Ratio</B></span> is calculated by formula:
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<p> </p>
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<p><img src="../image21.gif" width="158px" height="110px" border="0" class="img_whs3"></p>
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<p><img src="../image23.gif" width="120px" height="48px" border="0" class="img_whs4"></p>
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<p>where :</p>
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<p> </p>
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<p><img src="../image27.gif" width="234px" height="96px" border="0" class="img_whs5"></p>
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<p> </p>
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<p> </p>
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</li>
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<li class=kadov-p><p class="whs5">For a <span style="font-weight: bold;"><B>quadrangle</B></span>
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2D element consisting of 4 nodes the
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<span style="font-weight: bold;"><B>Aspect Ratio </B></span>is the
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quality of the worst triange which can be built taking three nodes of
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the quadrangle. There are four triangles to consider:</p></li>
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<p><img src="../image138.gif" width="566px" border="0" class="img_whs6"></p>
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</ul>
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<p class=TODO>To apply the Aspect Ratio quality criterion to your mesh:</p>
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<p class=TODO> </p>
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<p class="whs7">1. Display your mesh in the viewer.</p>
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<p class="whs7"> </p>
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<p class="whs7">2. Choose <span style="font-weight: bold;"><B>Controls
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> Aspect Ratio </B></span>or click <img src="../image37.gif" width="25px" height="24px" border="0" class="img_whs8"> button in the toolbar.
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Your mesh will be displayed in the viewer with its elements colored according
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to the applied mesh quality control criterion:</p>
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<p class="whs7"> </p>
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<p class="whs7"><img src="../image94.jpg" width="439px" height="313px" border="0" class="img_whs9"></p>
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<p class="whs7"> </p>
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<p class="whs5"><span style="font-weight: bold;"><B>See Also</B></span>
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a sample TUI Script of an <a href="../quality_controls.htm#bookmark8">Aspect
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Ratio quality control</a> operation. </p>
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<p> </p>
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<script type="text/javascript" language="javascript1.2">
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