\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)
CGAL 5.0.2 - Point Set Processing
Point_set_processing_3/structuring_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/IO/read_xyz_points.h>
#include <CGAL/IO/write_xyz_points.h>
#include <CGAL/property_map.h>
#include <CGAL/Shape_detection/Efficient_RANSAC.h>
#include <CGAL/structure_point_set.h>
#include <iostream>
#include <fstream>
// Type declarations
typedef Kernel::Point_3 Point;
typedef std::pair<Kernel::Point_3, Kernel::Vector_3> Point_with_normal;
typedef std::vector<Point_with_normal> Pwn_vector;
// Efficient RANSAC types
<Kernel, Pwn_vector, Point_map, Normal_map> Traits;
int main (int argc, char** argv)
{
// Points with normals.
Pwn_vector points;
// Loading point set from a file.
std::ifstream stream(argc>1 ? argv[1] : "data/cube.pwn");
if (!stream ||
std::back_inserter(points),
CGAL::parameters::point_map(Point_map()).
normal_map(Normal_map())))
{
std::cerr << "Error: cannot read file cube.pwn" << std::endl;
return EXIT_FAILURE;
}
std::cerr << points.size() << " point(s) read." << std::endl;
// Shape detection
Efficient_ransac ransac;
ransac.set_input(points);
ransac.add_shape_factory<Plane>();
ransac.detect();
Efficient_ransac::Plane_range planes = ransac.planes();
Pwn_vector structured_pts;
planes,
std::back_inserter (structured_pts),
0.015, // epsilon for structuring points
CGAL::parameters::point_map (Point_map()).
normal_map (Normal_map()).
plane_index_map (CGAL::Shape_detection::Point_to_shape_index_map<Traits>(points, planes)));
std::cerr << structured_pts.size ()
<< " structured point(s) generated." << std::endl;
std::ofstream out ("out.pwn");
CGAL::write_xyz_points (out, structured_pts,
CGAL::parameters::point_map(Point_map()).normal_map(Normal_map()));
out.close();
return EXIT_SUCCESS;
}