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    <div class="moz-cite-prefix">Steffen,<br>
      <br>
      I did a volume based on your surface mesh - see attached IGES
      (compressed with 7-zip).<br>
      After reading it into GMSH, you can create the 1D, then 2D and
      finally 3D mesh with no errors.<br>
      <br>
      You can do the same using GMSH volume definition (as already
      wrote)-> it will work, as the fundamental faces are plane
      triangles.<br>
      <br>
      Regards<br>
      Roman<br>
      <br>
      <br>
      W dniu 12.03.2014 18:27, Steffen Becker pisze:<br>
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    <blockquote cite="mid:532098E5.5050706@yahoo.de" type="cite">
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      <div class="moz-cite-prefix">Wrong .geo file, sorry!<br>
        <br>
        Am 12.03.2014 18:21, schrieb Steffen Becker:<br>
      </div>
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        <div class="moz-cite-prefix">Thank you so far,<br>
          <br>
          I create both files: .msh and .geo, but I still get the same
          error. What's my mistake?<br>
          <br>
          Steffen<br>
          <br>
          Am 12.03.2014 11:48, schrieb Roman Fratczak:<br>
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          <div class="moz-cite-prefix">Hi,<br>
            <br>
            FYI - you can remove double vertices/edges (or repair) in
            mesh in FreeCad (for exampe).<br>
            <br>
            regards<br>
            Roman<br>
            <br>
            <br>
            <br>
            W dniu 12.03.2014 10:17, Steffen Becker pisze:<br>
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            <div class="moz-cite-prefix">Hi Matthias & Roman,<br>
              <br>
              I create a nodes- and elements-list like this:<br>
              # nodes:<br>
              N1 0,0,0<br>
              N2 0,1,0<br>
              N3 1,0,0<br>
              N4 0,0,1<br>
              # elements, which describe triangles:<br>
              E1 1,2,3<br>
              E2 2,3,4<br>
              <br>
              So I do have double edges (here: between node 2+3). Didn't
              now that this is a problem for gmsh, sorry.<br>
              <br>
              I will try Romans solution asap and give you a feedback.<br>
              Thank you both!<br>
              <br>
              Steffen<br>
              <br>
              <br>
              Am 12.03.2014 09:59, schrieb Zenker, Dr. Matthias:<br>
            </div>
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cite="mid:F9562F3B302F29479A203FC5AF9E3E052F7E3A@SERBE4I1.intra.erbe-med.de"
              type="cite">
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                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi




                    Steffen,<o:p></o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US">I am not totally sure from what you
                    wrote that there are really no duplicated nodes. In
                    gmsh, you need to define the surfaces in a way that
                    neighbouring surfaces/facets with a common border
                    use the _<i>same</i>_ nodes to define the border. I
                    could not see from your file if there are duplicated
                    nodes, and would propose that you make sure that
                    there are really no such duplications.<o:p></o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US"><o:p> </o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US">If the meshing still fails, then this
                    is a question for the real gurus (Christophe?).<o:p></o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US"><o:p> </o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US">HTH,<o:p></o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US"><o:p> </o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US">Matthias<o:p></o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US"><o:p></o:p></span></p>
                <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
                    lang="EN-US"><o:p> </o:p></span></p>
                <p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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                      <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
                            lang="EN-US">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"
                          lang="EN-US"> Roman Fratczak [<a
                            moz-do-not-send="true"
                            class="moz-txt-link-freetext"
                            href="mailto:fratczakroman@o2.pl">mailto:fratczakroman@o2.pl</a>]
                          <br>
                        </span><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">Gesendet:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
                          Mittwoch, 12. März 2014 09:51<br>
                          <b>An:</b> Steffen Becker<br>
                          <b>Cc:</b> <a moz-do-not-send="true"
                            class="moz-txt-link-abbreviated"
                            href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><br>
                          <b>Betreff:</b> Re: [Gmsh] Error : Self
                          intersecting surface mesh, computing
                          intersections (this could take a while)<o:p></o:p></span></p>
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                  <p class="MsoNormal"><o:p> </o:p></p>
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                    <p class="MsoNormal">Hi Steffen,<br>
                      <br>
                      No it is more clear. If you are working with cloud
                      of point, then you may use Meshlab for surface
                      regeneration. There are many software that are
                      able to handle in a resonable way the cloud of
                      points (like rhino3D + resurf, other). But these
                      are rather commercial.<br>
                      <br>
                      From the other side - try to do the simplest
                      thing:<br>
                      <br>
                      Adjust your python script for surface creation in
                      order to save not as PLY but as GMSH "geo" file
                      using points and lines<br>
                      <br>
                      Point(1)={0,0,0} ;<br>
                      Point(2)={0,1,0} ;<br>
                      ...<br>
                      <br>
                      Line(1) = {1,2};<br>
                      ..<br>
                      and.. Line Loop & Surface -> Volume ..<br>
                      <br>
                      Then you will get a volume defined by geometric
                      entities. In this case is shoul be easier to
                      create a better mesh on surface and then on whole
                      volume.<br>
                      <br>
                      Regards<br>
                      Roman<br>
                      <br>
                      <br>
                       <br>
                      W dniu 11.03.2014 17:59, Steffen Becker pisze:<o:p></o:p></p>
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                      <p class="MsoNormal">Hi,<br>
                        <br>
                        @ Roman:<br>
                        some more details:<br>
                        I have a point cloud given and generate the
                        surface mesh by myself (with python). I don't
                        know a good algorithm to create a volume mesh
                        out of this surface mesh - that's why I use gmsh
                        for this task.<br>
                        I also checked my surface mesh for double
                        vertexes but I didn't find any. What do you mean
                        with "double egdes"? Isn't there always a
                        "double edge", because two neighbour facets
                        always have one same edge?!<br>
                        <br>
                        I will send you a .step or .iges file as soon as
                        I figured out how to handle the "No OpenCASCADE
                        model found" error.<br>
                        <br>
                        I'm appending the other mailing history (with
                        Matthias) to this mail - sorry for that "double
                        mailing", I just forgot one time to "reply to
                        all" -.-<br>
                        Anyone else has an idea why the meshing fails?<br>
                        <br>
                        Regards and thank you a lot,<br>
                        Steffen<br>
                        <br>
                        <br>
                        <br>
                        <o:p></o:p></p>
                      <pre>Hi Steffen,<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>I don't see either why the meshing fails, sorry.<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>Matthias<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>-----Ursprüngliche Nachricht-----<o:p></o:p></pre>
                      <pre>Von: Steffen Becker [<a moz-do-not-send="true" href="mailto:steffenbecker87@yahoo.de">mailto:steffenbecker87@yahoo.de</a>]<o:p></o:p></pre>
                      <pre>Gesendet: Dienstag, 11. März 2014 14:42<o:p></o:p></pre>
                      <pre>An: Zenker, Dr. Matthias<o:p></o:p></pre>
                      <pre>Cc: <a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
                      <pre>Betreff: Re: [Gmsh] Error : Self intersecting surface mesh, computing<o:p></o:p></pre>
                      <pre>intersections (this could take a while)<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>Oh I'm really sorry, here is the file.<o:p></o:p></pre>
                      <pre>In addition I sent you also the intersect.pos. I don't understand why exactly<o:p></o:p></pre>
                      <pre>these surfaces are problematic and the "neighbour surfaces"<o:p></o:p></pre>
                      <pre>aren't - although they have the same geometry =/<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>Am 11.03.2014 12:07, schrieb Zenker, Dr. Matthias:<o:p></o:p></pre>
                      <pre>Hi Steffen,<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>if you don't provide the myfile.ply2, we cannot see your geometry...<o:p></o:p></pre>
                      <pre> You can visualize intersect.pos by merging it to your geometry.<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>HTH,<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre>Matthias<o:p></o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <pre><o:p> </o:p></pre>
                      <p class="MsoNormal">Am 11.03.2014 14:33, schrieb
                        Roman Fratczak:<o:p></o:p></p>
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                        <p class="MsoNormal">Hello,<br>
                          <br>
                          It is possible, that you will get your
                          geometry in other format? <br>
                          In your "ply" there is already a surface mesh
                          given. Try maybe use STEP, IGES,...  as input-
                          then it is easer to recalculate the surface
                          mesh.<br>
                          <br>
                          In case of need of usage of "a dead mesh" -
                          maybe try first to remesh it (i.e. in blender
                          with modification Remesh) and/or clean it
                          (removing double vertexes and edges).<br>
                          <br>
                          regards<br>
                          Roman<br>
                          <br>
                          <br>
                          <br>
                          <br>
                          W dniu 11.03.2014 12:13, Steffen Becker pisze:<o:p></o:p></p>
                      </div>
                      <blockquote
                        style="margin-top:5.0pt;margin-bottom:5.0pt">
                        <div>
                          <p class="MsoNormal">Hi,<br>
                            <br>
                            in the appendix you find my model.<br>
                            Thanks for  help!!<br>
                            <br>
                            Regards,<br>
                            Steffen<br>
                            <br>
                            Am 11.03.2014 11:47, schrieb Roman Fratczak:<o:p></o:p></p>
                        </div>
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                          style="margin-top:5.0pt;margin-bottom:5.0pt">
                          <div>
                            <p class="MsoNormal">Hello Steffen,<br>
                              <br>
                              Yes. You can try to the first Optimize
                              quality of tetra, or all of them (just
                              try).<br>
                              <br>
                              I don't know how your model looks like. If
                              the elements on the surface are too big,
                              then the solid elements (probably
                              tetragonal) may be with intersecting edges
                              or faces. Therefore the reducing size of
                              element may help (especially on the
                              surfaces).<br>
                              <br>
                              Or- just share your model (ply) -in order
                              to be more precise.<br>
                              <br>
                              regards<br>
                              Roman<br>
                              <br>
                              <br>
                              <br>
                              W dniu 10.03.2014 18:06, Steffen Becker
                              pisze:<o:p></o:p></p>
                          </div>
                          <blockquote
                            style="margin-top:5.0pt;margin-bottom:5.0pt">
                            <div>
                              <p class="MsoNormal">Hi Roman,<br>
                                when you say "enable option: optimize",
                                you mean" Tools -> Options -> Mesh
                                -> Advanced -> Optimize quality of
                                tetrahedra, Optimize quality of
                                tetrahedra with Netgen, Optimize high
                                order meshes (experimental)" ?<br>
                                And why is reducing element size
                                important? In my case it is important
                                that the object has such "90 degree
                                corners".<br>
                                <br>
                                Regards,<br>
                                Steffen<br>
                                <br>
                                Am 10.03.2014 16:55, schrieb Roman
                                Fratczak:<o:p></o:p></p>
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                                <p class="MsoNormal">Hi Steffen,<br>
                                  <br>
                                  If your volume is OK (is really a
                                  closed one) - try to:<br>
                                  <br>
                                  1. Reduce element size (especially in
                                  a curved shapes)<br>
                                  2. Enable option "Optimize" - in mesh
                                  options <br>
                                  <br>
                                  Regards<br>
                                  Roman<br>
                                  <br>
                                  <br>
                                  <br>
                                  W dniu 10.03.2014 16:41, Steffen
                                  Becker pisze:<o:p></o:p></p>
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                                <p class="MsoNormal">Hello everyone, <br>
                                  <br>
                                  I'm a gmsh beginner and I want to
                                  create a 3D volume mesh out of a given
                                  surface-mesh but I got the error
                                  message as seen in the subject. You
                                  find my .geo file in the appendix. <br>
                                  Can anyone tell me what I have to do
                                  to create a 3D mesh? I even can't
                                  figure out where the intersection are
                                  located (don't know how to read the
                                  intersect.pos). <br>
                                  Sorry for my poor english. <br>
                                  <br>
                                  Regards, <br>
                                  Steffen <br>
                                  <br>
                                  <br>
                                  <br>
                                  <o:p></o:p></p>
                                <pre>_______________________________________________<o:p></o:p></pre>
                                <pre>gmsh mailing list<o:p></o:p></pre>
                                <pre><a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
                                <pre><a moz-do-not-send="true" href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><o:p></o:p></pre>
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                                <o:p></o:p></p>
                              <pre>_______________________________________________<o:p></o:p></pre>
                              <pre>gmsh mailing list<o:p></o:p></pre>
                              <pre><a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
                              <pre><a moz-do-not-send="true" href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><o:p></o:p></pre>
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                              <o:p></o:p></p>
                            <pre>_______________________________________________<o:p></o:p></pre>
                            <pre>gmsh mailing list<o:p></o:p></pre>
                            <pre><a moz-do-not-send="true" href="mailto:gmsh@geuz.org">gmsh@geuz.org</a><o:p></o:p></pre>
                            <pre><a moz-do-not-send="true" href="http://www.geuz.org/mailman/listinfo/gmsh">http://www.geuz.org/mailman/listinfo/gmsh</a><o:p></o:p></pre>
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                          <p class="MsoNormal"><o:p> </o:p></p>
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                        <p class="MsoNormal"><o:p> </o:p></p>
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                  <p class="MsoNormal"><o:p> </o:p></p>
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