> 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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--
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
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