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      <title>Check Criteria - Multiple Knots (M6)</title>
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      <div class="title_topic4" id="xps10_pagetitle">Check Criteria - Multiple Knots (M6)</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">Multiple Knots (M6)</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 (in case of underlying surface is a bspline surface)</p>
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               <p class="para_td">Parameter</p>
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               <p class="para_td">Upper bound of Multiple Knots constraint value</p>
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               <p class="para_td">What is analyzed ?</p>
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               <p class="para_td">Only inner knots are considered for checking. The list of&nbsp; inner knots is a subrange of the full knot vector. Duplicate knot values at start and end of the parameter interval are excluded from the list of inner knots. Investigate the list of&nbsp; inner knots in u- and v-direction. </p>
               <p class="para_td">Check two consecutive knots&nbsp; t[k] and t[k+1] . The criterion is violated if: </p>
               <p class="para_td">ABS (t[k+1] - t[k]) &lt;&nbsp; Multiple Knots constraint value. </p>
               <p class="para_td">Example: Full knot vector in u-direction: ( 0.0, 0.0, 0.0, 0.0, 0.3333, 0.3334, 1.0, 1.0, 1.0, 1.0 ) List of inner knots:&nbsp; ( 0.0, 0.3333, 0.3334, 1.0 ) </p>
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               <p class="para_td"> <img align="bottom" src="graphics/v2sum6.gif" border="0"> [IMG_4955]
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               <p class="para_th">Example of Indistinct Surface Knots</p>
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               <p class="para_td">Results Log&nbsp; Output</p>
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                        <p class="para_td">M6sf</p>
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                        <p class="para_td">object_id</p>
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                        <p class="para_td">face</p>
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                        <p class="para_td">value</p>
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                        <p class="para_td">violation knot difference </p>
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                        <p class="para_td">value2</p>
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                        <p class="para_td">knot value t[k+1] in u- or v-direction</p>
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                        <p class="para_td">point</p>
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                        <p class="para_td">point at u-v-parameters knot value and first knot value of the other direction</p>
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                        <p class="para_td">point2</p>
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                        <p class="para_td">point at u-v-parameters knot value and last&nbsp; knot value of the other direction</p>
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