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      <title>Check Criteria - Identical Surface (M2)</title>
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      <div class="title_topic4" id="xps10_pagetitle">Check Criteria - Identical Surface (M2)</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_surf.html');return(false);">Faces (Surfaces)</a></p>
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               <p class="para_td">&nbsp;Identical Surface (M2)</p>
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               <p class="para_td">Input</p>
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               <p class="para_td">Faces of solid bodies and sheet bodies</p>
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               <p class="para_td">Parameter</p>
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               <p class="para_td">Lower limit constraint value of Identical distance</p>
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               <p class="para_td">What is analyzed ?</p>
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                     <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
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                           <p class="para_note_body">NOTE:&nbsp; According to VDA 4955 this check is restricted to underlying surfaces. Identical faces should be checked with Identical Face. In general Identical Surface is of minor usability for NX because underlying surfaces cannot exist without faces which could lead to duplicate error logging (M2sf and M2f). If not needed for special investigations, it is recommended to switch off this extensive check. </p>
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               <p class="para_td">Check if two surfaces are geometrically identical. The criterion (M2sf) is violated if a surface pair either deviates less than the constraint value of Identical distance or differs in extent but one surface is completely embedded (&quot;stamp on a letter&quot;) within the other surface.</p>
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               <p class="para_td"> <img align="bottom" src="graphics/v2sum2.gif" border="0"> [IMG_4955] 
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               <p class="para_th">Example of an Approximation of Identical Surfaces</p>
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               <p class="para_td">1 - Embedded Surface</p>
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                           <p class="para_note_body"> Underlying surfaces of type plane, cylinder, cone, sphere and extruded are infinite in one or two directions by definition (see Parasolid). This could generate violations for adjoining faces which have different underlying surfaces inside Identical distance. </p>
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               <p class="para_td">Results Log&nbsp; Output</p>
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                        <p class="para_td">M2sf</p>
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                        <p class="para_td">object_id</p>
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                        <p class="para_td">face1 (owner of surface1)</p>
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                        <p class="para_td">object_id2</p>
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                        <p class="para_td">face2 (owner of surface2)</p>
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                        <p class="para_td">value</p>
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                        <p class="para_td">type of&nbsp; identical condition &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </p>
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                        <p class="para_td">0</p>
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                        <p class="para_td">Identical underlying surfaces</p>
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                        <p class="para_td">1</p>
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                        <p class="para_td">Surface2 is completely embedded within surface1</p>
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                        <p class="para_td">value2</p>
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                        <p class="para_td">maximum deviation distance</p>
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                        <p class="para_td">point</p>
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                        <p class="para_td">surface2 point at maximal distance </p>
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                        <p class="para_td">sub_id</p>
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                        <p class="para_td">same as object_id2</p>
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