[Gmsh] opencascade: union, disregard seams

[Nico Schlömer]

> Note that this relies on the new Compound implementation, which will
still undergo major changes
> until it is released in Gmsh 3.1 or Gmsh 4.0, hopefully early next year.

Alright, I'll hold out for it. Thanks for the tip!

> PS: have a look at the new Python API (see demos/api/*.py), which you
might find useful.

Very interesting! I might switch pygmsh's backend to it once this is more
mature.

Cheers,
Nico

[1] https://github.com/nschloe/pygmsh

On Fri, Dec 8, 2017 at 8:58 PM Christophe Geuzaine <cgeuzaine at uliege.be>
wrote:

>
>
> > On 8 Dec 2017, at 16:24, Nico Schlömer <nico.schloemer at gmail.com> wrote:
> >
> > Hi everyone,
> >
> > When combining two domains using an opencascade union, the seams will
> still be respected by the mesher. As an example, check out the geometry of
> a union of two overlapping circles:
> > ```
> > SetFactory("OpenCASCADE");
> > s0 = news;
> > Disk(s0) = {-5.0, 0.0, 0.0, 10.0};
> > s1 = news;
> > Disk(s1) = {5.0, 0.0, 0.0, 10.0};
> > bo1[] = BooleanUnion{Surface {s0}; Delete;} {Surface {s1}; Delete;};
> > ```
> > After the meshing process, the outlines of both circles are still
> recognizable.
> >
> > Is it possible to give the mesher the freedom to disregard the outlines?
> >
>
> With the latest snapshots, do:
>
> SetFactory("OpenCASCADE");
> s0 = news;
> Disk(s0) = {-5.0, 0.0, 0.0, 10.0};
> s1 = news;
> Disk(s1) = {5.0, 0.0, 0.0, 10.0};
> bo1() = BooleanUnion{Surface {s0}; Delete;} {Surface {s1}; Delete;};
> Compound Surface{bo1()};
>
> Note that this relies on the new Compound implementation, which will still
> undergo major changes until it is released in Gmsh 3.1 or Gmsh 4.0,
> hopefully early next year.
>
> Christophe
>
> PS: have a look at the new Python API (see demos/api/*.py), which you
> might find useful.
>
>
> > Cheers,
> > Nico
> > _______________________________________________
> > gmsh mailing list
> > gmsh at 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
>
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://onelab.info/pipermail/gmsh/attachments/20171209/03770708/attachment.html>