Hi Andre - Could you try again with a recent build and tell us if things improved?
Thanks, Christophe On 31 Oct 2012, at 06:18, Andre Nicolle <[email protected]> wrote: > Dear gmsh user group > > I have been struggling with meshing a stl file of a human mesh. The stl > surface is in good shape with a closed surface which when loaded into gmsh > and meshed using the procedure outlined in > https://geuz.org/trac/gmsh/wiki/STLRemeshing forms a three-dimensional mesh. > Unfortunately the tetrahedron element quality is very poor. On further > investigation we found that this was caused by poor quality elements on the > 2D surface after the surface was remeshed. We tried using Mesh.Algorithm: 1 > = MeshAdapt, 2=Automatic, 5=Delaunay, 6=Frontal and found that in general > Frontal gave us the best elements which were all very good quality except on > the interface between the multilevel mesh partitions. Information on the > partition stage of 2-D meshing is given below. > > Attached is a picture showing the line-up of poor quality elements around the > waist of the human. Nearly all the other 2-D triangular elements have a mesh > quality indicator gamma > 0.5, however elements on theinterface have gamma > approximately 0.03 which we believe is where the 3-D mesh problem is starting > from. > > Could somebody give us some advice on how best to solve this problem as I > imagine it is a mistake on our implementation. If further information is > required please let me know what would be helpful to diagnose the problem. > > Any help would be gratefully received > > Andre > > gmsh version 2.6.1 > > Info : Meshing surface 200 (Compound surface, MeshAdapt) > Warning : Wrong topology: Genus=0, Nb boundaries=0, AR=1 > Info : ----------------------------------------------------------- > Info : --- Split surface 200 in 2 parts with Multilevel Mesh partitioner > Info : Building graph... > Info : Partitioning graph... > Info : Launching Chaco graph partitioner > Info : Done partitioning graph > Info : *** Mesh partition: level (1-0) is ZERO-GENUS (AR=5, NB=1) > Info : *** Mesh partition: level (1-1) is ZERO-GENUS (AR=4, NB=1) > Info : Multiscale Partition SUCCESSFULLY PERFORMED : 2 parts (3.26 s) > Info : *** Starting parametrize compounds: > Info : Parametrize Compound Line (2) = 1 discrete edge > Info : Parametrize Compound Surface (203) = 201 discrete face > Info : Parametrizing surface 203 with 'convex map' > > > Warning : Mesh generation error summary > Warning : 1 warning > Warning : 0 errors > Warning : Check the full log for details > > > <test.jpg>_______________________________________________ > gmsh mailing list > [email protected] > http://www.geuz.org/mailman/listinfo/gmsh -- Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine _______________________________________________ gmsh mailing list [email protected] http://www.geuz.org/mailman/listinfo/gmsh
