<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>Le 24-nov.-10 à 20:11, Meiner Auchmeiner a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>I just wanted to drop you all a quick note that I finally found a<br>solution for generating hexahedra meshes out of STL surfaces (with an<br>intermediate tetrahedral mesh step). Unfortunately, this solution is<br>not GMSH but an external program :(. As a further drawback this tool<br>is not even OpenSource... Fortunately, the academic license of it is<br>quite affordable. So everybody who runs into the same problems I did<br>should take a look at CUBIT (from Sandia National Labs). I hope it's<br>ok that I point towards this external solution - please excuse any<br>inconvenience caused.<br><br></div></blockquote><div><br></div><div>no problemo</div><div><br></div><div>JFR</div><br><blockquote type="cite"><div>Cheers,<br>Uwe<br><br>---<br><br>2010/11/23 Meiner Auchmeiner <<a href="mailto:auchmeiner@googlemail.com">auchmeiner@googlemail.com</a>>:<br><blockquote type="cite">Hello again,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">thank you very much for your quick reply.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">2010/11/23 Jean-Francois Remacle <<a href="mailto:jean-francois.remacle@uclouvain.be">jean-francois.remacle@uclouvain.be</a>>:<br></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Le 23-nov.-10 à 17:25, Meiner Auchmeiner a écrit :<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Hi gmsh group,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Hello,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I was wondering if anybody here succeeded to mesh a STL geometry with<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">an unstructured mesh consisting of hexahedra elements. I'm trying to<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">mesh following file(s) using standard settings, except for the<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">subdivision algorithm "All hexas": 500.stl & 500.geo (see attachment).<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I'm always getting the error messages "Error: Cannot evaluate point on<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">discrete face" and "Error: Cannot compute parametric coordinates on<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">discrete face". Whereas meshing the STL geometry with tetrahedron<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">elements work like a charm. Is there any intermediate step necessary<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">to optimize (maybe with e.g. MeshLab) the input STL geometry? Or is<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">there any gmsh preprocessing option/conversion I overlooked ?<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">There is actually NO automatic hexaedral mesher in GMSH.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">For doing a better STL, you can use the reparametrization tools, see<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="https://geuz.org/trac/gmsh/wiki/STLRemeshing">https://geuz.org/trac/gmsh/wiki/STLRemeshing</a> (username wiki, password wiki).<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">JF<br></blockquote></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Hmm, so do I get you right, there is no way (yet?) of generating<br></blockquote><blockquote type="cite">hexahedral meshes out of STL files in gmsh? In all my naivety I<br></blockquote><blockquote type="cite">thought it would be possible in GMSH to subdivide tetrahedra elements<br></blockquote><blockquote type="cite">in hexahedra elements... Say, what about the manual hexahedral mesher<br></blockquote><blockquote type="cite">in GMSH you just mentioned, is it - with the right manually input -<br></blockquote><blockquote type="cite">capable of meshing closed STL surface geometries with hexas?<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Uwe<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">Thanks<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Uwe<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">P.S.: The skeleton data have been obtained by courtesy of S. Van Sint<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Jan, Laboratory of Anatomy, Biomechanics and Organogenesis, Université<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Libre de Bruxelles.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><500.stl><500.geo>_______________________________________________<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">gmsh mailing list<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">------------------------------------------------------------------<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Prof. Jean-Francois Remacle<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Universite catholique de Louvain (UCL)<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Institute of Mechanics, Materials and Civil Engineering (iMMC)<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Center for Systems Engineering and Applied Mechanics (CESAME)<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Tel : +32-10-472352 -- Mobile : +32-473-909930<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><br></blockquote></div></blockquote></div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><span class="Apple-style-span" style="font-size: medium; "><div>------------------------------------------------------------------</div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Prof. Jean-Francois Remacle</span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Universite catholique de Louvain (UCL)</span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering</span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Institute of Mechanics, Materials and Civil Engineering (iMMC)</span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Center for Systems Engineering and Applied Mechanics (CESAME)</span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">Tel : +32-10-472352 -- Mobile : +32-473-909930 </span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; "><br></span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; "> </span></font></div><div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; "><br></span></font></div><div><br></div></span></div></div></div></span></div><br class="Apple-interchange-newline"></div></div></span><br class="Apple-interchange-newline"> </div><br></body></html>