CGAL 5.6.3 - Manual

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Poisson_surface_reconstruction_3/tutorial_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Point_set_3.h>
#include <CGAL/Point_set_3/IO.h>
#include <CGAL/remove_outliers.h>
#include <CGAL/grid_simplify_point_set.h>
#include <CGAL/jet_smooth_point_set.h>
#include <CGAL/jet_estimate_normals.h>
#include <CGAL/mst_orient_normals.h>
#include <CGAL/poisson_surface_reconstruction.h>
#include <CGAL/Advancing_front_surface_reconstruction.h>
#include <CGAL/Scale_space_surface_reconstruction_3.h>
#include <CGAL/Scale_space_reconstruction_3/Jet_smoother.h>
#include <CGAL/Scale_space_reconstruction_3/Advancing_front_mesher.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/polygon_soup_to_polygon_mesh.h>
#include <cstdlib>
#include <vector>
#include <fstream>
// types
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point_3;
typedef Kernel::Vector_3 Vector_3;
typedef Kernel::Sphere_3 Sphere_3;
typedef CGAL::Point_set_3<Point_3, Vector_3> Point_set;
int main(int argc, char*argv[])
{
Point_set points;
std::string fname = argc==1?CGAL::data_file_path("points_3/kitten.xyz") : argv[1];
if (argc < 2)
{
std::cerr << "Usage: " << argv[0] << " [input.xyz/off/ply/las]" << std::endl;
std::cerr <<"Running " << argv[0] << " data/kitten.xyz -1\n";
}
std::ifstream stream (fname, std::ios_base::binary);
if (!stream)
{
std::cerr << "Error: cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
stream >> points;
std::cout << "Read " << points.size () << " point(s)" << std::endl;
if (points.empty())
return EXIT_FAILURE;
typename Point_set::iterator rout_it = CGAL::remove_outliers<CGAL::Sequential_tag>
(points,
24, // Number of neighbors considered for evaluation
points.parameters().threshold_percent (5.0)); // Percentage of points to remove
points.remove(rout_it, points.end());
std::cout << points.number_of_removed_points()
<< " point(s) are outliers." << std::endl;
// Applying point set processing algorithm to a CGAL::Point_set_3
// object does not erase the points from memory but place them in
// the garbage of the object: memory can be freed by the user.
points.collect_garbage();
// Compute average spacing using neighborhood of 6 points
double spacing = CGAL::compute_average_spacing<CGAL::Sequential_tag> (points, 6);
// Simplify using a grid of size 2 * average spacing
typename Point_set::iterator gsim_it = CGAL::grid_simplify_point_set (points, 2. * spacing);
points.remove(gsim_it, points.end());
std::cout << points.number_of_removed_points()
<< " point(s) removed after simplification." << std::endl;
points.collect_garbage();
CGAL::jet_smooth_point_set<CGAL::Sequential_tag> (points, 24);
int reconstruction_choice
= argc==1? -1 : (argc < 3 ? 0 : atoi(argv[2]));
if (reconstruction_choice == 0 || reconstruction_choice==-1) // Poisson
{
CGAL::jet_estimate_normals<CGAL::Sequential_tag>
(points, 24); // Use 24 neighbors
// Orientation of normals, returns iterator to first unoriented point
typename Point_set::iterator unoriented_points_begin =
CGAL::mst_orient_normals(points, 24); // Use 24 neighbors
points.remove (unoriented_points_begin, points.end());
CGAL::Surface_mesh<Point_3> output_mesh;
CGAL::poisson_surface_reconstruction_delaunay
(points.begin(), points.end(),
points.point_map(), points.normal_map(),
output_mesh, spacing);
std::ofstream f ("out_poisson.ply", std::ios_base::binary);
CGAL::IO::set_binary_mode (f);
CGAL::IO::write_PLY(f, output_mesh);
f.close ();
}
if (reconstruction_choice == 1 || reconstruction_choice==-1) // Advancing front
{
typedef std::array<std::size_t, 3> Facet; // Triple of indices
std::vector<Facet> facets;
// The function is called using directly the points raw iterators
CGAL::advancing_front_surface_reconstruction(points.points().begin(),
points.points().end(),
std::back_inserter(facets));
std::cout << facets.size ()
<< " facet(s) generated by reconstruction." << std::endl;
// copy points for random access
std::vector<Point_3> vertices;
vertices.reserve (points.size());
std::copy (points.points().begin(), points.points().end(), std::back_inserter (vertices));
CGAL::Surface_mesh<Point_3> output_mesh;
CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh (vertices, facets, output_mesh);
std::ofstream f ("out_af.off");
f << output_mesh;
f.close ();
}
if (reconstruction_choice == 2 || reconstruction_choice==-1) // Scale space
{
CGAL::Scale_space_surface_reconstruction_3<Kernel> reconstruct
(points.points().begin(), points.points().end());
// Smooth using 4 iterations of Jet Smoothing
reconstruct.increase_scale (4, CGAL::Scale_space_reconstruction_3::Jet_smoother<Kernel>());
// Mesh with the Advancing Front mesher with a maximum facet length of 0.5
reconstruct.reconstruct_surface (CGAL::Scale_space_reconstruction_3::Advancing_front_mesher<Kernel>(0.5));
std::ofstream f ("out_sp.off");
f << "OFF" << std::endl << points.size () << " "
<< reconstruct.number_of_facets() << " 0" << std::endl;
for (Point_set::Index idx : points)
f << points.point (idx) << std::endl;
for (const auto& facet : CGAL::make_range (reconstruct.facets_begin(), reconstruct.facets_end()))
f << "3 "<< facet[0] << " " << facet[1] << " " << facet[2] << std::endl;
f.close ();
}
else // Handle error
{
std::cerr << "Error: invalid reconstruction id: " << reconstruction_choice << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Point_set_3
CGAL::Scale_space_reconstruction_3::Advancing_front_mesher
CGAL::Scale_space_reconstruction_3::Jet_smoother
CGAL::Scale_space_surface_reconstruction_3
CGAL::Scale_space_surface_reconstruction_3::reconstruct_surface
void reconstruct_surface(const Mesher &mesher=Mesher())
CGAL::Scale_space_surface_reconstruction_3::facets_end
Facet_iterator facets_end()
CGAL::Scale_space_surface_reconstruction_3::facets_begin
Facet_iterator facets_begin()
CGAL::Scale_space_surface_reconstruction_3::number_of_facets
std::size_t number_of_facets() const
CGAL::Scale_space_surface_reconstruction_3::increase_scale
void increase_scale(std::size_t iterations=1, const Smoother &smoother=Smoother())
CGAL::Surface_mesh
Kernel::Point_3
Kernel::Sphere_3
Kernel::Vector_3
CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh
void polygon_soup_to_polygon_mesh(const PointRange &points, const PolygonRange &polygons, PolygonMesh &out, const NamedParameters_PS &np_ps=parameters::default_values(), const NamedParameters_PM &np_pm=parameters::default_values())
CGAL::advancing_front_surface_reconstruction
IndicesOutputIterator advancing_front_surface_reconstruction(PointInputIterator b, PointInputIterator e, IndicesOutputIterator out, double radius_ratio_bound=5, double beta=0.52)
CGAL::mst_orient_normals
PointRange::iterator mst_orient_normals(PointRange &points, unsigned int k, const NamedParameters &np=parameters::default_values())
CGAL::grid_simplify_point_set
PointRange::iterator grid_simplify_point_set(PointRange &points, double epsilon, const NamedParameters &np=parameters::default_values())
CGAL::poisson_surface_reconstruction_delaunay
bool poisson_surface_reconstruction_delaunay(PointInputIterator begin, PointInputIterator end, PointMap point_map, NormalMap normal_map, PolygonMesh &output_mesh, double spacing, double sm_angle=20.0, double sm_radius=30.0, double sm_distance=0.375, Tag tag=Tag())
CGAL::IO::set_binary_mode
Mode set_binary_mode(std::ios &s)
CGAL::IO::write_PLY
bool write_PLY(std::ostream &os, const Surface_mesh< P > &sm, const std::string &comments, const NamedParameters &np=parameters::default_values())
Kernel