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

[Christophe Geuzaine]

> 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
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