[Gmsh] normals (again)
John Borchardt
john.borchardt at gmail.com
Fri Feb 15 22:14:22 CET 2008
Well I'll be darned if I know how THAT got checked! Thanks,
everything is behaving as expected now!
On Fri, Feb 15, 2008 at 12:11 PM, Christophe Geuzaine
<cgeuzaine at ulg.ac.be> wrote:
>
> John Borchardt wrote:
> > 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
>
>
> You wouldn't have the "Reverse all normals" option checked in
> Tools->Options->Mesh->Light, by any chance?
>
>
>
>
>
>
>
>
>
> > 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
> >>
> >>
> >> ------------------------------------------------------------------------
> >>
> >>
> >> ------------------------------------------------------------------------
>
>
> >>
> >> _______________________________________________
> >> 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
>