[Gmsh] Preventing gmsh from adding additional nodes to surface edges composed of line segments
Christophe Geuzaine
cgeuzaine at ulg.ac.be
Thu Apr 16 13:42:03 CEST 2009
Knell, Sascha wrote:
> Hi,
>
>
>
> I intend to use gmsh in batch mode to mesh polygonal plane surfaces
> whereas nodes of the final mesh may only lie on predefined, equally
> spaced spots on the straight edges of the surface. The distance of these
> spots may not differ by more than factor two on the different edges of
> the surface. I tried to realize this by constructing an edges from
> several aligned lines and setting the minimum / maximum characteristic
> length to the minimum / maximum desired node distance. Regrettably, some
> of the longer lines exhibited additional nodes after meshing. I guess
> that I have misinterpreted the meaning of the characteristic length.
>
>
>
> Triangle, by Jonathan Richard Shewchuk, has an option to prevent the
> generation of additional nodes on line segments. Is there a way
> achieving the same in gmsh? I would prefer to use gmesh, since eyeball
> comparison indicates that gmsh produces meshes of better quality.
>
>
Hi Sascha - To enforce that the segments only have 2 vertices whatever
the prescribed characteristic length, you could do
Transfinite Line "*" = 2;
>
> Thanks in advance.
>
>
>
> Best regards,
>
>
>
> Sascha Knell
>
>
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine