CGAL 6.2 - Polygon Mesh Processing: Polygon_mesh_processing/point_inside_example.cpp

CGAL 6.2 - Polygon Mesh Processing

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Polygon_mesh_processing/point_inside_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <CGAL/point_generators_3.h>
#include <CGAL/Side_of_triangle_mesh.h>
#include <iostream>
#include <limits>
#include <string>
#include <vector>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_3 Point;
typedef CGAL::Polyhedron_3<K> Mesh;
namespace PMP = CGAL::Polygon_mesh_processing;
double max_coordinate(const Mesh& poly)
{
double max_coord = -std::numeric_limits<double>::infinity();
for(Mesh::Vertex_handle v : vertices(poly))
{
Point p = v->point();
max_coord = (std::max)(max_coord, CGAL::to_double(p.x()));
max_coord = (std::max)(max_coord, CGAL::to_double(p.y()));
max_coord = (std::max)(max_coord, CGAL::to_double(p.z()));
}
return max_coord;
}
int main(int argc, char* argv[])
{
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/eight.off");
Mesh poly;
if(!PMP::IO::read_polygon_mesh(filename, poly) || CGAL::is_empty(poly) || !CGAL::is_triangle_mesh(poly))
{
std::cerr << "Invalid input." << std::endl;
return 1;
}
CGAL::Side_of_triangle_mesh<Mesh, K> inside(poly);
double size = max_coordinate(poly);
unsigned int nb_points = 100;
std::vector<Point> points;
points.reserve(nb_points);
CGAL::Random_points_in_cube_3<Point> gen(size);
for (unsigned int i = 0; i < nb_points; ++i)
points.push_back(*gen++);
std::cout << "Test " << nb_points << " random points in cube "
<< "[-" << size << "; " << size <<"]" << std::endl;
int nb_inside = 0;
int nb_boundary = 0;
for (std::size_t i = 0; i < nb_points; ++i)
{
CGAL::Bounded_side res = inside(points[i]);
if (res == CGAL::ON_BOUNDED_SIDE) { ++nb_inside; }
if (res == CGAL::ON_BOUNDARY) { ++nb_boundary; }
}
std::cerr << "Total query size: " << points.size() << std::endl;
std::cerr << " " << nb_inside << " points inside " << std::endl;
std::cerr << " " << nb_boundary << " points on boundary " << std::endl;
std::cerr << " " << points.size() - nb_inside - nb_boundary << " points outside " << std::endl;
return 0;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Polyhedron_3
CGAL::Random_points_in_cube_3
CGAL::Side_of_triangle_mesh
This class provides an efficient point location functionality with respect to a domain bounded by one...
Definition: Side_of_triangle_mesh.h:77
CGAL::to_double
double to_double(const NT &x)
CGAL::is_triangle_mesh
bool is_triangle_mesh(const FaceGraph &g)
CGAL::is_empty
bool is_empty(const FaceGraph &g)
CGAL::Bounded_side
Bounded_side
CGAL::ON_BOUNDARY
ON_BOUNDARY
CGAL::ON_BOUNDED_SIDE
ON_BOUNDED_SIDE