[Gmsh] normals (again)
John Borchardt
john.borchardt at gmail.com
Fri Feb 15 20:00:33 CET 2008
Hi, please see attached screenshot. The geometry normal is in red and
the mesh normals are in green -- and they are pointing in opposite
directions as far as I can tell.
The .geo file that produced this is:
Point(1) = {0,0,0,0.1};
Point(2) = {1,0,0,0.1};
Point(3) = {0,1,0,0.1};
Line(1) = {1,2};
Line(2) = {2,3};
Line(3) = {3,1};
Line Loop(4) = {1,2,3};
Plane Surface(5) = {4};
The console output is:
Info : -------------------------------------------------------
Info : Gmsh version : 2.0.8
Info : Build OS : Linux
Info : Build options : GSL NETGEN JPEG PNG ZLIB MATHEVAL ANN
Info : Build date : Sat Aug 11 17:09:17 GMT 2007
Info : Build host : yellow
Info : Packager : buildd
Info : Home directory : /home/john/
Info : Launch date : Fri Feb 15 11:54:09 2008
Info : Command line : gmsh plate.geo
Info : -------------------------------------------------------
Info : Reading 'plate.geo'
Info : Read 'plate.geo'
Info : Meshing 1D...
Info : Meshing curve 1
Info : Meshing curve 2
Info : Meshing curve 3
Info : Mesh 1D complete (0 s)
Info : Mesh
Info : Meshing 2D...
Info : Meshing surface 5 (Plane, MeshAdapt+Delaunay)
Info : Mesh 2D complete (0.004 s)
Info : Mesh
Info : 21 vertices 40 elements
Info : Meshing 3D...
Info : Mesh 3D complete (0 s)
Info : Mesh
Info : 21 vertices 40 elements
Info : Reading 'plate.geo'
Info : Read 'plate.geo'
Info : Meshing 1D...
Info : Meshing curve 1
Info : Meshing curve 2
Info : Meshing curve 3
Info : Mesh 1D complete (0.004001 s)
Info : Mesh
Info : Meshing 2D...
Info : Meshing surface 5 (Plane, MeshAdapt+Delaunay)
Info : Mesh 2D complete (0 s)
Info : Mesh
Info : 22 vertices 42 elements
Any ideas what's going wrong? I am using Ubuntu 7.10 x86-64 and I
installed via apt-get I believe. Thanks!
--John
On Fri, Feb 15, 2008 at 11:32 AM, Christophe Geuzaine
<cgeuzaine at ulg.ac.be> wrote:
> John Borchardt wrote:
> > Sorry I am looking in the manual and list archives and I still don't
> > understand...
> >
> > Can you tell me if the default behaviour of gmsh is such that mesh
> > element normals are opposite of the surface normals? Am using version
> > 2.0.8.
> >
> > E.g., when I mesh the following .geo, the element normals are opposite
> > of the surface normal...
>
>
> I cannot reproduce this on my machine...
>
>
>
> >
> >
> > Point(1) = {0,0,0,0.1};
> > Point(2) = {1,0,0,0.1};
> > Point(3) = {0,1,0,0.1};
> > Line(1) = {1,2};
> > Line(2) = {2,3};
> > Line(3) = {3,1};
> > Line Loop(4) = {1,2,3};
> > Plane Surface(5) = {4};
> >
> >
> >
> > Thanks,
> >
> >
> > --John
> >
> > _______________________________________________
> > gmsh mailing list
> > gmsh at geuz.org
> > http://www.geuz.org/mailman/listinfo/gmsh
> >
> >
>
>
> --
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
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