CGAL users discussion list

[Stephane Tayeb <>]

Ramin H wrote:
> Hi everyone,
>
> I am using the Meshe_3 in CGAL 3.6. The meshing criteria is as follows:
> Cell Aspect Ratio: 3.0
> Facet Angle: 25
>
> And I have turned on Exuding. When I inspect the mesh, I can still see
> plenty of tetrahedra that are violating the aspect ratio rule. I am using
> the resulting mesh for a Finite Element Analysis and the quality of mesh has
> a significant impact on the accuracy of the results.
>
> How can I get rid of all (or most) of bad tetrahedra?
>
> Thanks,
> -Ramin

Hi Ramin,

After the mesh generation step, you should have a mesh that fulfills 
your criteria, i.e. every tetrahedron of the mesh should have a 
*radius-edge ratio <= 3* (is that what you call aspect ratio ?)

As the sliver exudation process tries to increase the smallest dihedral 
angle in the mesh, there is no guarantee that the radius-edge ratio 
would not decrease during exudation.

What are your criteria to consider a tetrahedron is bad ?

Best,
Stéphane.

--
Stephane Tayeb
Software engineer - INRIA Sophia Antipolis
Geometrica Project-Team