CGAL users discussion list

[Laurent Saboret <>]

Le 08/08/2011 09:24, Yifei Li a écrit :
> Hi all,
>
> read_xyz_points_and_normals(std::stream& in , OutputIterator output, 
> PointPMap point_pmap, NormalPMap normal_pmap) is used to read coordinates and 
> normals from a file (see CGAL/IO/read_xyz_points_and_normals.h). I don't 
> understand what the parameters point_pmap and normal_pmap are useful for. It 
> sounds like they are used to hold coordinates and normals respectively, but  I 
> think output is used for this purpose too. I guess I may use the function in the 
> following way:
>
> typedef std::vector< std::pair<Point,Vector> > points;
> read_xyz_points_and_normals(input,std::back_inserter(points));
>
>
> I appreciate your help.
>
> Yifei

Hi Yifei,

The "point_pmap" and "normal_pmap" property maps are used to access the point or normal 
information inside the "output" point type, so as to let the user decide upon the implementation 
of a point with normal.
See the property maps documentation at
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Point_set_processing_3/Chapter_main.html#Section_56.2

An example is provided in this documentation, and other examples are provided in 
"Surface Reconstruction from Point Sets" chapter
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Surface_reconstruction_points_3/Chapter_main.html

Best regards,
Laurent Saboret