CGAL users discussion list

[Sebastien Loriot <>]

The code used is exactly the same, so if you made it work with one 
function it should work with the second one. I suggest you look at the
difference you have in function calls to see where it could come from.
Without a minimal example showing the problem it would be hard to help more.

Best,

Sebastien.

On 5/10/23 14:32, "蓝色追风" ( via cgal-discuss Mailing 
List) wrote:
> 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
>
>
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>
> 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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