[Gmsh] visualization question

[Christophe Geuzaine]

John Sheehan wrote:
> Hello,
>   I found Gmsh on Monday morning and I have to say it is an excellent, 
> intuitive and
> very useful program.
> 
> I have a question regarding the rendering. Consider the following simple 
> input,
> 
> View "temp" {
>         SQ( 0,0,0, 1,0,0, 1,1,0, 0,1,0 ){ 5, 10, 10, 0 };
>         SQ( 1,0,0, 2,0,0, 2,1,0, 1,1,0 ){ 10, 5, 0, 10 };
> };
> 
> Should the rendering of this be vaguely symmetrical? Instead there 
> appears to be
> a diagonal line across each square element. See attached png.
> 

Yes, that's "normal": quads are rendered as 2 triangles in Gmsh. 
(Interpolation in a quad is not linear.)


> Is it possible to remove this diagonal line and get a more symmetric 
> looking image?
> 

The next version of Gmsh will have arbitrary high-order post-processing. 
  If you cannot wait until the next release, you could use the technique 
described in this post:

http://geuz.org/pipermail/gmsh/2006/001816.html

But beware that the syntax will be different in the next release.



> Regards,
> 
> John.
> 
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine