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["蓝色追风" <>]

Yes, with "PMP::corefine_and_compute_union" I can distinguish which sub-mesh of the union belongs to which original mesh, just like the example code you sent me. But it seems that this does not work with "corefine_and_compute_intersection". Is it because some meshes are recreated during the intersection operation? Do you have any suggestions on how to distinguish the faces in the resulting mesh after "intersection"?

Best wishes,

Daye

---

蓝色追风

Original Email

Sender:"cgal-discuss"< >;

Sent Time:2023/5/10 11:27

To:"cgal-discuss"< >;

Subject:Re: [cgal-discuss] Have trouble using NamedParameters"face_index_map" in "corefine_and_compute_intersection"

The corresponding mesh is passed as a reference in visitor calls so you
can compare the address of the mesh with the one you are interested in.

Best,

Sebastien.

On 5/10/23 11:19, "蓝色追风" ( via cgal-discuss Mailing
List) wrote:
> Hi, again,
>
> I tried your suggestion and implemented the example code you gave me.
> However, for many faces of intersection, the visitor cannot recognize
> whether they come from "mesh1" or "mesh2". Taking this example
> (https://github.com/CGAL/cgal/blob/master/Polygon_mesh_processing/examples/Polygon_mesh_processing/corefinement_mesh_union_with_attributes.cpp ) as an example, many "out_id" of the intersected mesh are "-1". Do I need to handle the intersected mesh specially for a relatively complicated mesh?
>
> Thanks again.
>
> Best wishes,
> Daye
> ------------------------------------------------------------------------
>
>
> 蓝色追风
>
>
>
>
>
>
>
> Original Email
>
> Sender:"cgal-discuss"< >;
>
> Sent Time:2023/5/10 8:48
>
> To:"cgal-discuss"< >;
>
> Subject:Re: [cgal-discuss] Have trouble using Named
> Parameters"face_index_map" in "corefine_and_compute_intersection"
>
>
> face_index_map is not an output parameter. It is used internally by the
> code to avoid using a hash map. If you want to track correspondance
> between input and output, you should use the visitor:
>
> https://doc.cgal.org/latest/Polygon_mesh_processing/classPMPCorefinementVisitor.html
>
> https://github.com/CGAL/cgal/blob/master/Polygon_mesh_processing/examples/Polygon_mesh_processing/corefinement_mesh_union_with_attributes.cpp
>
> Best,
>
> Sebastien.
>
> On 5/9/23 21:43, "蓝色追风" ( via cgal-discuss Mailing
> List)
> wrote:
> > Hi, all,
> >
> > I am currently using the CGAL command
> > "corefine_and_compute_intersection" to compute the intersection between
> > two surface meshes. At the same time, I want to determine the face index
> > of the intersection mesh in the original mesh. I noticed that the
> > "face_index_map" in the Named Parameters of
> > "corefine_and_compute_intersection" seems to be able to achieve this
> > functionality, but I am having trouble using it. Could you please
> > provide me with an example code to help me use the "face_index_map"
> feature?
> >
> > Thank you for your time and help!
> >
> > Best wishes,
> > Daye
> >
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