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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hello,<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;mso-fareast-language:EN-US"><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;mso-fareast-language:EN-US">Unfortunately, Gmsh is
<a href="http://gmsh.info/doc/texinfo/gmsh.html#and-what-Gmsh-is-not-so-good-at">
fairly limited when it comes to operations like computing intersections</a>. However, you might be able to do something using the OpenCascade factory included in the latest nigthly build. You can download it from
<a href="http://gmsh.info/">gsmh.info</a>, under the download paragraph, just under the “Development version” mention. For example, you might want to have a look at the Boolean.geo exemple
<a href="https://onelab.info/svn/gmsh/trunk/demos/boolean/">here</a> and there few examples on how to import geometry from files (they will only work with the nightly, ID & password = gmsh). Hoping that will be helpful,<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;mso-fareast-language:EN-US"><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;mso-fareast-language:EN-US">Faithfully Yours,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Tahoma",sans-serif;color:#000099">Guillaume DILASSER</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#000099"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099">Doctorant SACM / LEAS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099">CEA - Centre de Saclay - Bât.123 - PC 319c</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000099"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099">91191 Gif sur Yvette Cedex - France -</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#000099"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099"><a href="mailto:guillaume.dilasser@cea.fr"><span style="color:blue">guillaume.dilasser@cea.fr</span></a><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;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">De :</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> gmsh [mailto:gmsh-bounces@ace20.montefiore.ulg.ac.be]
<b>De la part de</b> Prithivirajan V<br>
<b>Envoyé :</b> vendredi 17 mars 2017 03:23<br>
<b>À :</b> gmsh@geuz.org<br>
<b>Objet :</b> [Gmsh] Creating a spherical hole inside a volume [Files attached for testing]<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello all,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">My objective is to create the spherical hole inside a volume. I have 2 STL files(see attached) as inputs. The complication is that the spherical hole intersects the two other existing volumes and it is not contained
entirely in either one of the volumes.<br>
<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I tried two approaches both of them were a failure (geo files are attached for both) :<o:p></o:p></p>
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<p class="MsoNormal"><b>Approach 1 :</b><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I used the merge command and then I created a spherical volume and performed meshing.
<span style="color:red">The issue is the sphere is getting meshed separately without any relation to the other 2 volumes.<br>
<br>
</span><br>
<b>Approach 2 :</b><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">First , I created an STL file of the spherical void separately. Now I used merge command on all 3 STL files.
<span style="color:red">Now i am getting intersections which I am unable to resolve.<br>
<br>
</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:blue">I have been stuck here for a while in this, your help would be greatly appreciated</span></b><span style="color:blue">!!!!</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Prithivi<o:p></o:p></p>
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