> On 4 Mar 2019, at 19:34, Christophe Geuzaine <[email protected]> wrote:
>
>
> Hi Daniel,
>
> It's one of the mysteries that we still haven't completely figured out with
> OpenCASCADE. I believe the issue is linked to our use of
> BRepBuilderAPI_Sewing to create shells ("surface loops"); but up to now we
> couldn't figure out how to create shells from surfaces without this, which
> indeed (sometimes) creates new surfaces...
>
> Any insights from OpenCASCADE folks would be most welcome!
>
PS : as a workaround you can add
BooleanFragments{ Volume{:}; Delete; }{}
at the end of the file, which will make everything conformal... but it's
expensive.
> Christophe
>
>
>> On 4 Mar 2019, at 17:09, Ingraham, Daniel J. (GRC-LTV0)
>> <[email protected]> wrote:
>>
>> Hi Gmsh users,
>>
>> I'm trying to mesh a geometry that has some rotational symmetry. In the
>> past, I've used the Rotate command to help with this, with good results.
>> With the built-in geometry kernel, everything works fine. With the
>> OpenCASCADE kernel, however, Gmsh appears to duplicate surfaces when I
>> define a new elementary volume after rotating the surfaces.
>>
>> I've read on this mailing list that OpenCASCADE will duplicate surfaces
>> when they aren't oriented properly, and that this can be disabled if
>> `Geometry.OCCAutoFix` is set to `0`. I've tried that, but the duplicate
>> surfaces are still created.
>>
>> With the built-in kernel, the orientation of a surface can be reversed
>> by negating its ID number in the `Surface Loop` call, but that doesn't
>> appear to be the case when using the OpenCASCADE kernel.
>>
>> I've attached two example geo scripts that demonstrate the problem.
>> `builtin.geo` uses the built-in kernel, and `opencascade.geo` uses
>> OpenCASCADE.
>>
>> Any ideas?
>>
>> Thanks!
>>
>> Daniel
>>
>> <builtin.geo><opencascade.geo>_______________________________________________
>> gmsh mailing list
>> [email protected]
>> 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
> [email protected]
> 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
[email protected]
http://onelab.info/mailman/listinfo/gmsh
