On 29 Aug 2013, at 20:44, Martin Genet <[email protected]> wrote:
> Sorry to insist, but I'm really stuck here. Hopefully someone can help me > understand what's going on. > > I made a minimal example (minimal.geo), to illustrate my problem. I first > merge the a couple STL files (STL.tar.gz), then create a couple Compound > Lines, and then eventually a Line Loop. However, the order of Compound Lines > seems to depend on whether or not I create the Line Loop (see > lines-WithoutLineLoop & lines-WithLineLoop). Is that the expected behavior? > Is there a logic behind this? > Hi Martin - It's a limitation of the current implementation of "CreateTopology". In this routine (which reconstructs all the connectivity data that is missing in the STL), some operations depend on sets of entities (vertices, elements), which are sorted by their memory address (pointer). The order in which features (curves) are created depends on this ordering, which itself changes from run to run. We should definitely change this, as it leads to numbering are change from run to run. It's in the TODO list... Christophe > One more thing I don't quite understand, is that even Points and Surfaces are > names "ll" (see visibility.png). Is that related to the previous issue? > > Thanks in advance for your help! > > Martin > > On 08/22/2013 03:14 PM, Martin Genet wrote: >> Dear GMSH people: >> >> I'm merging a bunch of stl files, and then work with lines & surfaces that I >> get using >> >> > ll[] = Line "*"; >> > ss[] = Surface "*"; >> >> However, I can't seem to figure out the ordering of the lines & surfaces, >> especially since it seems to change from one run to another, depending on >> what I do with them. Any help with that? Thanks! >> >> Martin >> >> >> _______________________________________________ >> gmsh mailing list >> [email protected] >> http://www.geuz.org/mailman/listinfo/gmsh > > <minimal.geo><STL.tar.gz><lines-WithLineLoop.pdf><lines-WithoutLineLoop.pdf><visibility.png>_______________________________________________ > 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
