[Gmsh] Surface Loops

[John Doe]

I ended up drawing the volume in the gui and it still crash, but now
for a different reason.

If I have the 8 corners of the box 1e-5 apart with a 5-e7
characteristic length the mesher crashes.

If I have the 8 corners of the box 1 apart with a 0.05 characteristic
length the mesher works.

This is gmsh 2.0.8 packaged for Ubuntu for a amd64 machine.

Is there a way to make this work without crashing?

Regards,

Juan

On Thu, Oct 2, 2008 at 12:56 PM, John Doe <ufnoise at gmail.com> wrote:
> I am learning to use gmsh, and I'd like to create a volume from the 6
> surfaces of a box.
>
> Right now gmsh is aborting, and I think that it may be because I don't
> understand how to order the indices in the surface loop command.  How
> are the surfaces supposed to be oriented, and when do I use a negative
> index?  At the end of this email are the errors I am  getting.
>
> Thank you,
>
> Juan
>
> Info    : Meshing 2D...
> Info    : Meshing surface 1 (Plane, MeshAdapt+Delaunay)
> Info    : Meshing surface 2 (Plane, MeshAdapt+Delaunay)
> Info    : Meshing surface 3 (Plane, MeshAdapt+Delaunay)
> Info    : Meshing surface 4 (Plane, MeshAdapt+Delaunay)
> Info    : Meshing surface 5 (Plane, MeshAdapt+Delaunay)
> Info    : Meshing surface 6 (Plane, MeshAdapt+Delaunay)
> Info    : Mesh 2D complete (1.28808 s)
> Info    : Mesh
> Info    : Meshing 3D...
> Info    : Meshing volume 1 (Netgen)
> Info    : Region 1 Face 1, 0 intersect
> Info    : Region 1 Face 3, 0 intersect
> Info    : Region 1 Face 5, 0 intersect
> Info    : Region 1 Face 6, 0 intersect
> Info    : Region 1 Face 4, 0 intersect
> Info    : Region 1 Face 2, 0 intersect
> Info    : CalcLocalH: 2638 Points 0 Elements 4840 Surface Elements
> Info    : Check subdomain 1 / 1
> Info    : 4840 open elements
> Fatal   : ERROR: Edge 1 - 9 multiple times in surface mesh
>