CGAL 6.1.2 - 3D Convex Hulls: Convex_hull_3/extreme_points_3_sm.cpp

CGAL 6.1.2 - 3D Convex Hulls

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Convex_hull_3/extreme_points_3_sm.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Extreme_points_traits_adapter_3.h>
#include <CGAL/convex_hull_3.h>
#include <vector>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_3 Point_3;
typedef CGAL::Surface_mesh<Point_3> Mesh;
int main(int argc, char* argv[])
{
const std::string filename = (argc>1) ? argv[1] : CGAL::data_file_path("meshes/star.off");
Mesh sm;
if(!CGAL::IO::read_polygon_mesh(filename, sm))
{
std::cerr<< "Cannot open input file." <<std::endl;
return 1;
}
//This will contain the extreme vertices
std::vector<Mesh::Vertex_index> extreme_vertices;
//call the function with the traits adapter for vertices
CGAL::extreme_points_3(vertices(sm), std::back_inserter(extreme_vertices),
CGAL::make_extreme_points_traits_adapter(sm.points()));
//print the number of extreme vertices
std::cout << "There are " << extreme_vertices.size() << " extreme vertices in this mesh." << std::endl;
return 0;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Surface_mesh
CGAL::IO::read_polygon_mesh
bool read_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())
CGAL::extreme_points_3
OutputIterator extreme_points_3(InputRange range, OutputIterator out, const Traits &traits)
copies in out the points on the convex hull of the points in range.
CGAL::make_extreme_points_traits_adapter
Extreme_points_traits_adapter_3< PointPropertyMap, Base_traits > make_extreme_points_traits_adapter(const PointPropertyMap &pmap, Base_traits traits)
Returns Extreme_points_traits_adapter_3<PointPropertyMap, Base_traits>(pmap, traits).