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Re:[cgal-discuss] Have trouble using Named Parameters"face_index_map" in "corefine_and_compute_intersection"


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  • From: "蓝色追风" <>
  • To: "cgal-discuss" <>
  • Subject: Re:[cgal-discuss] Have trouble using Named Parameters"face_index_map" in "corefine_and_compute_intersection"
  • Date: Wed, 10 May 2023 11:19:20 +0200
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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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> You are currently subscribed to cgal-discuss.
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