Hi Alessandro,
> On 23 Oct 2017, at 12:34, Alessandro Vicini <[email protected]>
> wrote:
>
> Hullo everybody,
>
> I find the following issues when using OpenCascade:
>
> 1) I start from the geometry of the attached test_00.geo: one cube, with a
> cubic hole;
> 2) Now if I want to apply a rotation to the inner cube (test_01.geo), I
> obtain that only the edges are rotated, and the original cube is conserved.
> This does not happen when the built-in geometry kernel is used (the applied
> rotation does not modify the surface loops that define the volume);
Indeed. With OpenCASCADE all operations actually create new shapes; for
transformations we try to re-bind the new shapes to the old tags when possible
- it's not the case here since the old shapes are still used in the volume.
> 3) On the other hand, if I first apply the rotation (test_02.geo) and then
> define the volume (test_03.geo), the inner surface loop is not recognized as
> a closed volume.
That's a limitation of the way we currently perform the transformation
operations (we do it "shape by shape") : this creates duplicate entities (here
lines) on the boundaries. Currently you'll need to apply
BooleanFragments{ Surface{1:6}; Delete; }
to get rid of them. Then you'll be able to define a closed volume.
Christophe
>
> Is there some way to work this out? Especially point 2) is an issue for me,
> as for my application I'd need to append the rotation command at the end of
> the geo file (i.e. after volume has been defined).
>
> A.
> <test_00.geo><test_01.geo><test_02.geo><test_03.geo>_______________________________________________
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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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