[Gmsh] 3D meshing won't work

[Magdalena Stolarska]

Thank you!  You're response was very helpful (what a silly mistake!)

However, I am still curious what a consistent elementary surface
orientation is (in Surface Loop explanation).

Thanks again -- MS

On Tue, 4 May 2004, Christophe Geuzaine wrote:

> Magdalena Stolarska wrote:
>
> > Hi.  I have a few of questions.  I apologize if they are elementary --
> > I'm fairly new to this and have a hard time finding an explanation on the
> > web.
> >
> > 1) What exactly is consistent elementary surface orientation (as described
> > under the Surface Loop explanation in the documentation of Gmsh 1.51)?
> >
> > 2) I've attached the *.geo file that I am working on -- For some reason,
> > the 2D surface meshing works okay, but the 3d meshing is not working (I
> > just end up with a 2d mesh).  Depending on what I choose the
> > characteristic length to be, I get a variety of complaints.  For example,
> > for a characteristic length of 0.1, I get no complaints other than one
> > error: "Error : No contour".  For a characteristic length of 0.05 I get
> > complaints like (in addition to the one above)
> > Error : Missing edge without any intersection (0.55,0.1,0.3) (0.55,0,0.3)
> > and
> > Warning : *Unrecoverable* face (0 <--> 1=2*(3-1)-3)
> > For a characteristic length of 0.04 the only error I get is "Error : No
> > contour".
> >
> >>From the little that I know gmsh, I am thinking that the fact that there
> > is no 3d mesh has to do with either the surface loop ordering or the
> > error:"Error : No contour".  I checked all of my Line Loops, and the
> > ordering seems okay, so could you at least please let me know what the no
> > contour error could mean.  Any other suggestions would also be greatly
> > appreciated.  Thank you.
>
> The definition of the line loop 74 is wrong:
>
> Line Loop(74) = {22,23,-47,45,48,25,26,27,28};
>
> should be replaced with
>
> Line Loop(74) = {22,23,-47,45,48,25,26,27,28,21};
>
>
> PS: You should use the graphical user interface to construct your loops:
> it makes the whole process soooo much easier...
>
> --
> Christophe Geuzaine
> Applied and Computational Mathematics, Caltech
> geuzaine at acm.caltech.edu - http://geuz.org
>
>