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      <title>Check Criteria - Unintentional Cavity (SO25)</title>
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      <div class="title_topic4" id="xps10_pagetitle">Check Criteria - Unintentional Cavity (SO25)</div>
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               <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>
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               <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>
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               <p class="para_td"> <a class="links" href="javascript:void(0)" onclick="top.openFile('nx_analysis/vda4955_check_crit_solids.html');return(false);">Solids</a></p>
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               <p class="para_td">Unintentional Cavity (SO25)</p>
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               <p class="para_td">Input</p>
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               <p class="para_td">Solid bodies</p>
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               <p class="para_td">Parameter</p>
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               <p class="para_td">None</p>
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               <p class="para_td">What is analyzed ?</p>
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               <p class="para_td">Check whether a solid has only one exterior shell. The regions of a body will be investigated. </p>
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                     <p class="para_item">A region is an open connected subset of 3-dimensional space whose boundary is a collection of vertices, edges, and oriented faces. </p>
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                     <p class="para_item">Regions are either solid or void (empty). </p>
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                     <p class="para_item">A body always has an infinite void region (which someone can think of as all the space outside of the body itself). </p>
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               <p class="para_td">For example, the left hollow cube shown below can be thought of as a collection of three regions: </p>
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                     <p class="para_item">The (infinite) void region outside the cube. </p>
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                     <p class="para_item">The region occupied by the solid material of the cube. </p>
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                  <li>
                     <p class="para_item">The empty void in the center of the cube. </p>
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               <p align="center"><img align="bottom" src="graphics/v2so25.gif"></p>
               <p class="para_td">Example of a Cavity: Not Allowed (left), Allowed (right)</p>
               <p class="para_td">The criterion is violated for each void region encountered except the infinite void region. </p>
               <p class="para_td">All feature components that contribute to the void region are identified for results logging and object highlighting. </p>
               <p class="para_td">Each involved pair [solid , feature component] is logged separately.</p>
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               <p class="para_td">Results Log&nbsp; Output</p>
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                        <p class="para_td">SO25</p>
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                        <p class="para_td">object_id</p>
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                        <p class="para_td">solid</p>
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                        <p class="para_td">object_id2</p>
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                        <p class="para_td">feature component </p>
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                        <p class="para_td">value</p>
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                        <p class="para_td">time stamp of feature component as reported by the Part Navigator tool</p>
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