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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to merge an existing mesh into a geometry and then mesh the unmeshed region using gmsh (something like a boundary mesh around a pre-existing mesh generated externally by another program). Ideally, this would result in a mesh
that was partially created in gmsh and partially created externally to gmsh. Ultimately, I would like to do this in both 2D and 3D but am starting with the following in 2D:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Merge "square";<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">SetFactory("OpenCASCADE");<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Surface Loop(1) = {1};<o:p></o:p></p>
<p class="MsoNormal">//sExternal = news;<o:p></o:p></p>
<p class="MsoNormal">//Rectangle(sExternal) = {0, 0, 0.0, 0.5, 0.5};<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">s1 = news;<o:p></o:p></p>
<p class="MsoNormal">Rectangle(s1) = {-0.25, -0.25, 0.0, 1.0, 1.0};<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">//BooleanDifference (2000) = { Surface{s1}; Delete; }{ Surface{sExternal}; };<o:p></o:p></p>
<p class="MsoNormal">BooleanDifference (2000) = { Surface{s1}; Delete; }{ Surface{1}; };<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">OpenCascade doesn’t recognize surface 1 and BooleanDifference causes gmsh to crash. I assume I am doing something wrong? Can gmsh embed an existing mesh into a gmsh geometry or CAD model?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<br>
Aaron<o:p></o:p></p>
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