<!DOCTYPE html
  PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<!--
Copyright (c) 2006 UGS Corp.

All Rights Reserved.

This software and related documentation are proprietary to UGS Corp.
-->
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>Check Criteria - Reversed Normals (F19)</title>
      <script language="javaScript">
        abridged="false";
        displayConditions=new Array();
      </script>
      <link type="text/css" href="../css/main_styles.css" rel="stylesheet">
   </head>
   <body class="bodydocs" onload="top.pageLoader()" bgcolor="#FFFFFF">
      <div class="title_topic4" id="xps10_pagetitle">Check Criteria - Reversed Normals (F19)</div>
      <hr noshade="true">
      <table cellspacing="4" width="100%" align="center">
         <tr valign="top">
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" width="20%">
               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_checker.html');return(false);">Check VDA-4955 Compliance Overview</a></p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" width="20%">
               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda_criteria.html');return(false);">Description of the Check Criteria</a></p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" width="20%">
               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda4955_check_crit_fac_topo.html');return(false);">Faces (Topology)</a></p>
            </td>
            <td bgcolor="#ffffff" colspan="1" rowspan="1" width="20%"></td>
            <td bgcolor="#ffffff" colspan="1" rowspan="1" width="20%"></td>
         </tr>
      </table><br><table cellspacing="4" width="100%" align="center">
         <tr valign="middle">
            <td bgcolor="#f4f4f4" colspan="2" rowspan="1" valign="top">
               <p class="para_td">Reversed Normals (T19) </p>
            </td>
         </tr>
         <tr valign="middle">
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">Input</p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">Geometrically adjacent faces of solid bodies and sheet bodies </p>
            </td>
         </tr>
         <tr valign="middle">
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">Parameter</p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">Topological Distance Tolerance</p>
            </td>
         </tr>
         <tr valign="middle">
            <td bgcolor="#f4f4f4" colspan="1" rowspan="4" valign="top">
               <p class="para_td">What is analyzed ?</p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">Check if a set of faces ( which need to be adjacent) have a consistent normal direction.</p>
               <p class="para_td">Before checking this criterion, the necessary topological information is computed. Information about one or several connected regions is the result of this computation. Using the topological information it is deduced whether the orientation of the face normals in each connected region is consistent. Face normals deviating in their direction from the majority of the face normals are logged. The criterion is violated if at least one face normal direction deviates from the majority direction. </p>
            </td>
         </tr>
         <tr>
            <td bgcolor="#F4F4F4" colspan="1" rowspan="1" valign="top">
               <p class="para_td"> <img align="bottom" src="graphics/v2ft19.gif" border="0">&nbsp;[IMG_4955]
               </p>
            </td>
         </tr>
         <tr>
            <th bgcolor="#F4F4F4" colspan="1" rowspan="1" valign="top">
               <p class="para_th">Example of Direction of Normals</p>
            </th>
         </tr>
         <tr>
            <td bgcolor="#F4F4F4" colspan="1" rowspan="1" valign="top">
               <table border="0">
                  <tr>
                     <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
                     <td valign="bottom" align="left" width="100%">
                        <div class="para_note">
                           <p class="para_note_body"> It is recommended to remove identical objects before applying this check. The normals of deviating faces are not reversed to create uniform orientation of a connected region.</p>
                        </div>
                     </td>
                  </tr>
               </table>
            </td>
         </tr>
         <tr valign="middle">
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <p class="para_td">Results Log&nbsp; Output</p>
            </td>
            <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
               <table cellspacing="0" align="center">
                  <tr valign="middle">
                     <td bgcolor="#f4f4f4" colspan="6" rowspan="1" valign="top">
                        <p class="para_td">T19</p>
                     </td>
                  </tr>
                  <tr valign="middle">
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
                        <p class="para_td">object_id</p>
                     </td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
                        <p class="para_td">face</p>
                     </td>
                  </tr>
                  <tr valign="middle">
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
                        <p class="para_td">value</p>
                     </td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
                        <p class="para_td">point position</p>
                     </td>
                  </tr>
                  <tr valign="middle">
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
                        <p class="para_td">vector</p>
                     </td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top"></td>
                     <td bgcolor="#f4f4f4" colspan="1" rowspan="1" valign="top">
                        <p class="para_td">face normal vector at point position (for conehead display)</p>
                     </td>
                  </tr>
               </table><br></td>
         </tr>
      </table><br></body>
</html>