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[Sebastien Loriot <>]

You can use dynamic property maps for example as documented here:
https://doc.cgal.org/latest/BGL/index.html#title25

Something like this should work fine:


  typedef boost::property_map<Polyhedron, 
CGAL::dynamic_edge_property_t<bool> >::type ECM;
ECM ecm  = get(CGAL::dynamic_edge_property_t<bool>(), polyhedron);

You need to init the value of the map using:
for (auto e : edges(polyhedron))
  put(ecm, e, false);

Best,

Sebastien


On 10/29/22 04:36, Calvin Lim ( via cgal-discuss 
Mailing List) wrote:
> Hi there,
>
>               In the example code 
> “Polygon_mesh_processing/corefinement_difference_remeshed.cpp 
> <https://doc.cgal.org/latest/Polygon_mesh_processing/Polygon_mesh_processing_2corefinement_difference_remeshed_8cpp-example.html>” , there is this method to get the constrained edges after the difference between 2 meshes are computed.
>
> /// start of code
>
>    //create a property on edges to indicate whether they are constrained
>
>    Mesh::Property_map<edge_descriptor,bool> is_constrained_map =
>
>      mesh1.add_property_map<edge_descriptor,bool>("e:is_constrained", 
> false).first;
>
>    // update mesh1 to contain the mesh bounding the difference
>
>    // of the two input volumes.
>
>    bool valid_difference =
>
>      PMP::corefine_and_compute_difference(mesh1,
>
>                                           mesh2,
>
>                                           mesh1,
>
>                                           params::all_default(), // 
> default parameters for mesh1
>
>                                           params::all_default(), // 
> default parameters for mesh2
>
>                                           
> params::edge_is_constrained_map(is_constrained_map));
>
> /// end of code
>
>                In my case, I wanted to use the Polyhedron class to 
> perform the exact same function. But I have no idea how to set the 
> property_map properly. Is there anyone that can guide me thru the 
> process? Thanks!
>
> Regards
>
> Calvin
>
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>
>
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