CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le Friday, September 29, 2017 5:32:04 PM CEST Michael Bieri a écrit :

> Hi,

>

> I attached an image of a mesh. It's a screenshot where you see the top of a

> block containing two cylinders and another material at the top and bottom.

> The data is given as a segmented image. I do protect features of the image

> as given below.

>

> I over and over again observe those relatively large, flat triangles around

> the phase boundaries as well as along the outer edges. I tried around for

> hours, but I don't get any grasp where they come from.

>

> I tried all sorts of mesh criteria, combing various of those options:

> Mesh_criteria

> criteria(facet_angle=30, facet_size=cell_size_fct,

> facet_distance=cell_size_fct, cell_radius_edge_ratio=3,

> cell_size=cell_size_fct);

> The cell_size_fct gives a value that seems to correspond to the elements

> inside the phase, but seems to be ignored in the elements at the boundary.

>

> Where does this strange behavior around the phase and outer boundary come

> from?

 

It probably comes from the mesh of 1d features. Try to add:

 

edge_size=cell_size_fc

 

to the Mesh_criteria constructor.

 

--

Laurent Rineau, PhD

R&D Engineer at GeometryFactory http://www.geometryfactory.com/

Release Manager of the CGAL Project http://www.cgal.org/