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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_mesh_processing/interpolated_corrected_curvatures.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <CGAL/Surface_mesh.h>
#include <boost/graph/graph_traits.hpp>
#include <iostream>
#include <string>
namespace PMP = CGAL::Polygon_mesh_processing;
typedef CGAL::Exact_predicates_inexact_constructions_kernel Epic_kernel;
typedef CGAL::Surface_mesh<Epic_kernel::Point_3> Mesh;
typedef boost::graph_traits<Mesh>::vertex_descriptor vertex_descriptor;
int main(int argc, char* argv[])
{
// instantiating and reading mesh
Mesh smesh;
const std::string filename = (argc > 1) ?
argv[1] :
CGAL::data_file_path("meshes/sphere.off");
if (!CGAL::IO::read_polygon_mesh(filename, smesh))
{
std::cerr << "Invalid input file." << std::endl;
return EXIT_FAILURE;
}
// loop over vertices and use vertex_descriptor to compute a curvature on one vertex
for (vertex_descriptor v : vertices(smesh))
{
double h, g;
PMP::Principal_curvatures_and_directions<Epic_kernel> p;
PMP::interpolated_corrected_curvatures(v,
smesh,
CGAL::parameters::vertex_mean_curvature(std::ref(h))
.vertex_Gaussian_curvature(std::ref(g))
.vertex_principal_curvatures_and_directions(std::ref(p)));
// we can also specify a ball radius for expansion and a user defined vertex normals map using
// named parameters. Refer to interpolated_corrected_curvatures_SM.cpp to see example usage.
std::cout << v.idx() << ": HC = " << h
<< ", GC = " << g << "\n"
<< ", PC = [ " << p.min_curvature << " , " << p.max_curvature << " ]\n";
}
return 0;
}
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