CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

I think if you do the same approach but within the original mesh it 
should be working. Let me explain:

You have your selection a faces within the input mesh. Then mark as 
constrained edge any edge incident to a face on the boundary of your 
selection (this reduce the selection by one layer of faces basically).
Then mark all the faces outside this sub-selection as exterior of the
mesh domain and run the refinement.

Sebastien.

On 9/6/19 12:18 AM, Renato Poli wrote:
> I need to refine only a selection of a coarse mesh, and I am using CGAL's CDT
> (2D).
> The boundary of the selection must be kept identical to the original one (no
> hanging nodes allowed!).
>
> I go through the following steps:
>         (1) extract the submesh set from the original mesh
>         (2) define the boundary of the submesh and add as a constrain Polygon
> in CDT
>         (3) refine the submesh using a sizing field with the reference point
> in the center of the submesh (I don't want to refine in the boundaries to
> avoid hanging nodes!).
>         (4) reintegrate the submesh in the main mesh.
>
> The problem is I am not able to avoid hanging nodes.
> Please refer to the attached picture.
>
> Is there an algorithm to ensure only the center of the submesh will be
> refined, avoiding _completely_ the creation of hanging nodes on the
> boundaries?
>
> <http://cgal-discuss.949826.n4.nabble.com/file/t376144/delaunay_trriangulation.png>
>
> Thanks for the help,
> Renato
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/