see https://www.freecadweb.org/wiki/Part_BooleanFragments
the CompSolids greated with the tool above work great together with
GMSH to make connected multi body meshes !
It is even possible to invoke GMSH from within FreeCAD and make
differet mesh size or mesh groups for the different bodies, by GUI or
by python :-)
bernd
Zitat von Jeremy Theler <[email protected]>:
Just to complete, you can also get a compsolid through a boolean
fragment at FreeCAD. There has been a long discussion on FreeCAD's side.
See for example first this:
https://forum.freecadweb.org/viewtopic.php?t=13830
And lately this:
https://forum.freecadweb.org/viewtopic.php?t=13830
--
Jeremy Theler
www.seamplex.com
On Sat, 2017-03-18 at 09:46 +0100, Christophe Geuzaine wrote:
> On 17 Mar 2017, at 23:24, Bram Sterling
<[email protected]> wrote:
>
> I'm trying to mesh a 3D 2-material construct created in another
program (FreeCAD) and brought into Gmsh by way of a BREP file.
After some troubleshooting downstream, I determined that Gmsh is
turning the two volumes into two disjoint meshes despite their
extensive shared surface.
>
> Poking around, I suspect the reason for this is that the two
volumes share no elementary geometry. Instead, the shared lines
and surfaces are duplicated.
>
> If the original geometry had been defined in a Geo script this
would seem straightforward to fix manually, but it seems a bit more
complicated here, especially as this is bound to come up again with
more complex geometry later. Is deleting the redundant geometry
and rebuilding other effected parts manually the best option, or is
there a better way?
>
With a recent nightly build, create a .geo script that does the
following (assuming the brep contains 2 volumes):
SetFactory("OpenCASCADE");
a() = ShapeFromFile("file.brep");
BooleanFragments{ Volume{a(0)}; Delete; }{ Volume{a(1)}; Delete; }
Note that you can now directly create your CAD inside Gmsh: see
demos/boolean/*.geo for examples.
Christophe
>
> Thank you,
> Bram Sterling
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