[Gmsh] [GMSH] Surface mesh for 3D solids

[Anderson Gabriel Santiago]

Thank you for your response. But that is quite unexpected, since the normal
vectors define the volume. So my question is, how can I make all the normal
vectors point outward the volume? I am working with boundary element method
and the normal vector orientation is really important to the method.

Thanks in advance,

On Thu, May 17, 2018 at 3:54 AM, Christophe Geuzaine <geuzaine at gmail.com>
wrote:

>
>
> > On 16 May 2018, at 00:28, Anderson Gabriel Santiago <
> agasantiago.usp at gmail.com> wrote:
> >
> > Dear all,
> >
> > I am using GMSH to create a 3D surface mesh. For some unknown reason,
> some normal vectors points inwards, not outwards,
>
> The mesh is oriented according to the orientation of the geometrical
> surface - everything is correct in your file. You can check by visualizing
> both the geometry and the mesh normals (in Tools->Options->Geometry or
> Mesh->Visibility->Normals)
>
> Christophe
>
>
> > as I would expect, since I defined a solid limited by plane surfaces.
> >
> > Here is the GEO file I created using the GMSH GUI.
> >
> >
> > // Gmsh project created on Tue May 15 19:19:43 2018
> > SetFactory("OpenCASCADE");
> > //+
> > Point(1) = {0, 0, 0, 1.0};
> > //+
> > Point(2) = {1, 0, 0, 1.0};
> > //+
> > Point(3) = {1, 1, 0, 1.0};
> > //+
> > Point(4) = {0, 1, 0, 1.0};
> > //+
> > Point(5) = {0, 0, 1, 1.0};
> > //+
> > Point(6) = {1, 0, 1, 1.0};
> > //+
> > Point(7) = {1, 1, 1, 1.0};
> > //+
> > Point(8) = {0, 1, 1, 1.0};
> > //+
> > Line(1) = {1, 2};
> > //+
> > Line(2) = {2, 6};
> > //+
> > Line(3) = {6, 5};
> > //+
> > Line(4) = {5, 1};
> > //+
> > Line(5) = {5, 8};
> > //+
> > Line(6) = {8, 4};
> > //+
> > Line(7) = {4, 1};
> > //+
> > Line(8) = {8, 7};
> > //+
> > Line(9) = {7, 3};
> > //+
> > Line(10) = {3, 4};
> > //+
> > Line(11) = {6, 7};
> > //+
> > Line(12) = {3, 2};
> > //+
> > Line Loop(1) = {4, -7, -6, -5};
> > //+
> > Plane Surface(1) = {1};
> > //+
> > Line Loop(2) = {2, 11, 9, 12};
> > //+
> > Plane Surface(2) = {2};
> > //+
> > Line Loop(3) = {3, 5, 8, -11};
> > //+
> > Plane Surface(3) = {3};
> > //+
> > Line Loop(4) = {10, 7, 1, -12};
> > //+
> > Plane Surface(4) = {4};
> > //+
> > Line Loop(5) = {9, 10, -6, 8};
> > //+
> > Plane Surface(5) = {5};
> > //+
> > Line Loop(6) = {3, 4, 1, 2};
> > //+
> > Plane Surface(6) = {6};
> > //+
> > Surface Loop(1) = {4, 5, 2, 6, 3, 1};
> > //+
> > Volume(1) = {1};
> > //+
> > Physical Surface(1) = {6};
> > //+
> > Physical Surface(2) = {4, 2, 3, 1};
> > //+
> > Physical Surface(3) = {5};
> > //+
> > Physical Volume(4) = {1};
> >
> > Any help is appreciated.
> >
> > --
> > Anderson Gabriel Santiago
> >
> >
> > ~"If you are depressed,
> >    you are living in the past.
> >    If you are anxious,
> >    you are living in the future.
> >    If you are at peace,
> >    you are living in the present."~   - Lao Tzu
> > _______________________________________________
> > gmsh mailing list
> > gmsh at onelab.info
> > http://onelab.info/mailman/listinfo/gmsh
>
>


-- 
Anderson Gabriel Santiago, Ph.D., E.E.
Adjunct Professor, Biomedical Engineering - UFABC
agasantiago.usp at gmail.com <santiago.eletrica at gmail.com>
Cel.: +55 11 99801-0881 <%2811%29%2099801-0881>

~"If you are depressed,
   you are living in the past.
   If you are anxious,
   you are living in the future.
   If you are at peace,
   you are living in the present."~   - Lao Tzu
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