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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Please consider the attached .geo file: there is an external boundary surface, and an internal cylinder generated using the OpenCascade primitive.
 After its generation, the cylinder volume and base surfaces are deleted (the remaining surface should then be embedded in the outer volume). At this point, if I try to generate the volume enclosed by the exterior boundary, I get an error (“unknown OpenCascade
 face…”). <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">On the other hand, I can FIRST generate the outer volume, and then the internal cylinder. In this case, however, when I try to embed the cylinder
 surface I am not allowed to select the volume… what is the problem (in both cases)? I am using v3.0.1. Thank you.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alessandro<o:p></o:p></span></p>
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