> On 9 Apr 2019, at 21:00, Timo Koch <timo.k...@iws.uni-stuttgart.de> wrote: > > Dear Gmsh community, > > like in this previous post on this mailing list > (http://onelab.info/pipermail/gmsh/2017/011809.html), > > I have a tree-like geometry, consisting of a union cylinders and spheres, and > I'd like to cut it out of a box. > > The problem mentioned in this post in 2017 still seems to persist in Gmsh > 4.2.3. > > I've been trying to subtract a lot of cylinders and spheres from a box > geometry. It works for a small amount of cylinders but refuses to work for > many geometries. The error message is simply > > Error : Intersection operation cannot be performed > Error : 'tree.geo', line 3480 : Could not apply boolean operator > > I attached the geo file. Any idea what the problem is? Is there some kind of > internal limit on how many geometry objects can participate in boolean > operations? >
It's a limitation of OpenCASCADE, which indeed still fails to perform boolean operations on some complex geometries. I encourage you to export the geometry in the native OpenCASCADE .brep format without the boolean operation (i.e. add Save "file.brep"; before the boolean operation in the .geo file) and file a bug report with the OpenCASCADE folks describing what you want to do. Christophe > Thank you for your help > > Timo > > > > -- > _______________________________________________________________ > > Timo Koch phone: +49 711 685 64676 > IWS, Universität Stuttgart fax: +49 711 685 60430 > Pfaffenwaldring 61 email: > timo.k...@iws.uni-stuttgart.de > > D-70569 Stuttgart url: > www.hydrosys.uni-stuttgart.de > > _______________________________________________________________ > > <tree.geo>_______________________________________________ > gmsh mailing list > gmsh@onelab.info > http://onelab.info/mailman/listinfo/gmsh — Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine _______________________________________________ gmsh mailing list gmsh@onelab.info http://onelab.info/mailman/listinfo/gmsh
