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      <title>Geometry</title>
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      <div class="title_topic2" id="xps10_pagetitle">Geometry </div>
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      <p class="para_topic">In I-deas there is no real distinction between &nbsp;</p>
      <p class="para_topic">(1) an open part, (2) a closed solid part, or (3) a part with extra internal surface partitions or external open surfaces. </p>
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      <p class="para_topic">In NX, case (1) is called a &quot;sheet&quot; or a &quot;sheet body.&quot; Most final parts will fall into case (2), called a &quot;body&quot; or a &quot;solid body&quot; in NX. Case (3) cannot be represented in NX.</p>
      <p class="para_topic">Case (1) and case (3) are sometimes both called &quot;non-manifold&quot; topology. For the purpose of this user guide, only case (3) will be referred to as non-manifold. This is geometry where three or more surfaces meet at a common edge. This type of geometry is used in I-deas Simulation to model mid-surface abstractions of thin-walled parts and to include internal partitions to define material boundaries inside solid parts.</p>
      <p class="para_topic">Geometry falling into case (3) will be transferred to NX by creating and transferring a separate body for each volume region. These multiple bodies will be placed in the same .prt file in NX.</p>
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