[Gmsh] Physical points

[Christophe Geuzaine]

Martin Vymazal wrote:
> Hello,
> 
>  I'd like to know if there's a way to force Gmsh to use certain points
> that define my geometry to become also mesh points.
>  My (2D) domain is a physical surface that contains one hole. This hole is
> defined by a physical line (spline, in fact) that passes through a large
> number of points. I'd like to use only some of these points as mesh
> nodes. I thought that making certain points 'physical' does the job, but
> apparently this doesn't work.

No, defining Physical Points will only result in their associated mesh 
elements (0-D) to be saved as groups in the mesh file.

Gmsh does not enforce spline control points to be part of the 1-D mesh 
(except for the first and last one). You could try to force these points 
to be part of the 2D mesh with "Point{p} In Surface{s};", but this might 
lead to a bad-quality mesh depending on your choice of element sizes.

Christophe


>  I know I could mesh my lines using 'progression' or 'bump', but this
> doesn't give me the node distribution that I want.
> 
>  Thanks for any help,
> 
>             Martin Vymazal
> 
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> 


-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine