Write normals in a PLY file

[stla]

Hello,

The doc claims that CGAL::IO::write_PLY includes the normals in the PLY file if they are given in the property map v:normal. But what should be the value type of this property map? A std::vector<double> of size 3?

[afabri]

A Vector_3 of the same kernel as the point type of the surface mesh.