[Gmsh] Changing the angle threshold for recombining to degenerate quadrangles

jan . janneggers at outlook.com
Wed Jul 15 14:00:43 CEST 2015


Update:

Apparently the angle option is only honored when
Mesh.RecombinationAlgorithm = 0 ;

Before I was using
Mesh.RecombinationAlgorithm = 1 ;

Follow-up question: 
Is it possible to allow degenerate quadrangles when using the Blossom recombination algorithm?
 


> On 15 Jul 2015, at 11:37, Jan Neggers <jan.neggers at lmt.ens-cachan.fr> wrote:
> 
> Hi,
> 
> My question is about this section of the GMSH manual:
> Recombine Surface { expression-list } | "*" < = expression >;
> Recombines the triangular meshes of the surfaces listed in expression-list into mixed triangular/quadrangular meshes. The optional expression on the right hand side specifies the maximum difference (in degrees) allowed between the largest angle of a quadrangle and a right angle (a value of 0 would only accept quadrangles with right angles; a value of 90 would allow degenerate quadrangles; default value is 45). 
> 
> 
> I want to specify the angle which is discussed in this section, but I can’t get it to work. Namely, whatever I do the results is the same, which seems to correspond with the 45 degree default.
> 
> is the following syntax correct?
> Recombine Surface {1} = 90; 
> to allow degenerate quads?
> 
> 
> Greetings Jan

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