\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - Point Set Processing

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Point_set_processing_3/wlop_simplify_and_regularize_point_set_example.cpp
#include <CGAL/Simple_cartesian.h>
#include <CGAL/wlop_simplify_and_regularize_point_set.h>
#include <CGAL/IO/read_xyz_points.h>
#include <CGAL/IO/write_xyz_points.h>
#include <vector>
#include <fstream>
#include <iostream>
// types
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point;
// Concurrency
#ifdef CGAL_LINKED_WITH_TBB
typedef CGAL::Parallel_tag Concurrency_tag;
#else
typedef CGAL::Sequential_tag Concurrency_tag;
#endif
int main(int argc, char** argv)
{
const char* input_filename = (argc>1)?argv[1]:"data/sphere_20k.xyz";
const char* output_filename = (argc>2)?argv[2]:"data/sphere_20k_WLOPED.xyz";
// Reads a .xyz point set file in points[]
std::vector<Point> points;
std::ifstream stream(input_filename);
if (!stream || !CGAL::read_xyz_points(stream, std::back_inserter(points)))
{
std::cerr << "Error: cannot read file " << input_filename << std::endl;
return EXIT_FAILURE;
}
std::vector<Point> output;
//parameters
const double retain_percentage = 2; // percentage of points to retain.
const double neighbor_radius = 0.5; // neighbors size.
CGAL::wlop_simplify_and_regularize_point_set
<Concurrency_tag>
(points.begin(),
points.end(),
std::back_inserter(output),
retain_percentage,
neighbor_radius
);
std::ofstream out(output_filename);
if (!out || !CGAL::write_xyz_points(
out, output.begin(), output.end()))
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}