CGAL 6.2 - Boolean Operations on Meshes

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PMP_Boolean_operations/corefinement_consecutive_bool_op.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/corefinement.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <iostream>
#include <string>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Exact_predicates_exact_constructions_kernel EK;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef boost::graph_traits<Mesh>::vertex_descriptor vertex_descriptor;
typedef Mesh::Property_map<vertex_descriptor,EK::Point_3> Exact_point_map;
namespace PMP = CGAL::Polygon_mesh_processing;
namespace params = CGAL::parameters;
// One could perform Boolean operations directly on inexact meshes as an exact computation
// is done internally. However, if we want to perform consecutive Boolean operations,
// we can avoid multiple conversions and possible precision issues by maintaining
// explicitly the exact points in the meshes.
struct Exact_vertex_point_map
{
// typedef for the property map
typedef boost::property_traits<Exact_point_map>::value_type value_type;
typedef boost::property_traits<Exact_point_map>::reference reference;
typedef boost::property_traits<Exact_point_map>::key_type key_type;
typedef boost::read_write_property_map_tag category;
// exterior references
Exact_point_map exact_point_map;
Mesh* tm_ptr;
// Converters
CGAL::Cartesian_converter<K, EK> to_exact;
CGAL::Cartesian_converter<EK, K> to_input;
Exact_vertex_point_map()
: tm_ptr(nullptr)
{}
Exact_vertex_point_map(const Exact_point_map& ep, Mesh& tm)
: exact_point_map(ep)
, tm_ptr(&tm)
{
for (Mesh::Vertex_index v : vertices(tm))
exact_point_map[v]=to_exact(tm.point(v));
}
friend
reference get(const Exact_vertex_point_map& map, key_type k)
{
CGAL_precondition(map.tm_ptr!=nullptr);
return map.exact_point_map[k];
}
friend
void put(const Exact_vertex_point_map& map, key_type k, const EK::Point_3& p)
{
CGAL_precondition(map.tm_ptr!=nullptr);
map.exact_point_map[k]=p;
// create the input point from the exact one
map.tm_ptr->point(k)=map.to_input(p);
}
};
int main(int argc, char* argv[])
{
const std::string filename1 = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/blobby.off");
const std::string filename2 = (argc > 2) ? argv[2] : CGAL::data_file_path("meshes/eight.off");
Mesh mesh1, mesh2;
if(!PMP::IO::read_polygon_mesh(filename1, mesh1) || !PMP::IO::read_polygon_mesh(filename2, mesh2))
{
std::cerr << "Invalid input." << std::endl;
return 1;
}
Exact_point_map mesh1_exact_points =
mesh1.add_property_map<vertex_descriptor,EK::Point_3>("v:exact_point").first;
Exact_point_map mesh2_exact_points =
mesh2.add_property_map<vertex_descriptor,EK::Point_3>("v:exact_point").first;
Exact_vertex_point_map mesh1_vpm(mesh1_exact_points, mesh1);
Exact_vertex_point_map mesh2_vpm(mesh2_exact_points, mesh2);
if ( PMP::corefine_and_compute_intersection(mesh1,
mesh2,
mesh1,
params::vertex_point_map(mesh1_vpm),
params::vertex_point_map(mesh2_vpm),
params::vertex_point_map(mesh1_vpm) ) )
{
if ( PMP::corefine_and_compute_union(mesh1,
mesh2,
mesh2,
params::vertex_point_map(mesh1_vpm),
params::vertex_point_map(mesh2_vpm),
params::vertex_point_map(mesh2_vpm) ) )
{
std::cout << "Intersection and union were successfully computed\n";
CGAL::IO::write_polygon_mesh("inter_union.off", mesh2, CGAL::parameters::stream_precision(17));
return 0;
}
std::cout << "Union could not be computed\n";
return 1;
}
std::cout << "Intersection could not be computed\n";
return 1;
}
CGAL::Cartesian_converter
CGAL::Exact_predicates_exact_constructions_kernel
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Surface_mesh
CGAL::Polygon_mesh_processing::corefine_and_compute_intersection
bool corefine_and_compute_intersection(TriangleMesh &tm1, TriangleMesh &tm2, TriangleMesh &tm_out, const NamedParameters1 &np1=parameters::default_values(), const NamedParameters2 &np2=parameters::default_values(), const NamedParametersOut &np_out=parameters::default_values())
corefines tm1 and tm2 and puts in tm_out a triangulated surface mesh bounding the intersection of t...
Definition: corefinement.h:637
CGAL::Polygon_mesh_processing::corefine_and_compute_union
bool corefine_and_compute_union(TriangleMesh &tm1, TriangleMesh &tm2, TriangleMesh &tm_out, const NamedParameters1 &np1=parameters::default_values(), const NamedParameters2 &np2=parameters::default_values(), const NamedParametersOut &np_out=parameters::default_values())
corefines tm1 and tm2 and puts in tm_out a triangulated surface mesh bounding the union of the volu...
Definition: corefinement.h:605
CGAL::IO::write_polygon_mesh
bool write_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())
CGAL::parameters