CGAL 5.6.3 - 3D Alpha Wrapping

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Alpha_wrap_3/triangle_soup_wrap.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/alpha_wrap_3.h>
#include <CGAL/Polygon_mesh_processing/bbox.h>
#include <CGAL/IO/polygon_soup_io.h>
#include <CGAL/Real_timer.h>
#include <array>
#include <iostream>
#include <string>
#include <vector>
namespace AW3 = CGAL::Alpha_wraps_3;
using K = CGAL::Exact_predicates_inexact_constructions_kernel;
using Point_3 = K::Point_3;
using Mesh = CGAL::Surface_mesh<Point_3>;
int main(int argc, char** argv)
{
std::cout.precision(17);
// Read the input
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/blobby-shuffled.off");
std::cout << "Reading " << filename << "..." << std::endl;
std::vector<Point_3> points;
std::vector<std::array<std::size_t, 3> > faces;
if(!CGAL::IO::read_polygon_soup(filename, points, faces) || faces.empty())
{
std::cerr << "Invalid input." << std::endl;
return EXIT_FAILURE;
}
std::cout << "Input: " << points.size() << " points, " << faces.size() << " faces" << std::endl;
// Compute the alpha and offset values
const double relative_alpha = (argc > 2) ? std::stod(argv[2]) : 20.;
const double relative_offset = (argc > 3) ? std::stod(argv[3]) : 600.;
CGAL::Bbox_3 bbox;
for(const Point_3& p : points)
bbox += p.bbox();
const double diag_length = std::sqrt(CGAL::square(bbox.xmax() - bbox.xmin()) +
CGAL::square(bbox.ymax() - bbox.ymin()) +
CGAL::square(bbox.zmax() - bbox.zmin()));
const double alpha = diag_length / relative_alpha;
const double offset = diag_length / relative_offset;
// Construct the wrap
CGAL::Real_timer t;
t.start();
Mesh wrap;
CGAL::alpha_wrap_3(points, faces, alpha, offset, wrap);
t.stop();
std::cout << "Result: " << num_vertices(wrap) << " vertices, " << num_faces(wrap) << " faces" << std::endl;
std::cout << "Took " << t.time() << " s." << std::endl;
// Save the result
std::string input_name = std::string(filename);
input_name = input_name.substr(input_name.find_last_of("/") + 1, input_name.length() - 1);
input_name = input_name.substr(0, input_name.find_last_of("."));
std::string output_name = input_name
+ "_" + std::to_string(static_cast<int>(relative_alpha))
+ "_" + std::to_string(static_cast<int>(relative_offset)) + ".off";
std::cout << "Writing to " << output_name << std::endl;
CGAL::IO::write_polygon_mesh(output_name, wrap, CGAL::parameters::stream_precision(17));
return EXIT_SUCCESS;
}
CGAL::Bbox_3
CGAL::Bbox_3::ymin
double ymin() const
CGAL::Bbox_3::xmax
double xmax() const
CGAL::Bbox_3::zmin
double zmin() const
CGAL::Bbox_3::zmax
double zmax() const
CGAL::Bbox_3::ymax
double ymax() const
CGAL::Bbox_3::xmin
double xmin() const
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::alpha_wrap_3
void alpha_wrap_3(const PointRange &points, const FaceRange &faces, const double alpha, const double offset, OutputMesh &alpha_wrap, const InputNamedParameters &in_np, const OutputNamedParameters &out_np)
computes a watertight, 2-manifold, and intersection-free triangulated surface mesh that strictly cont...
Definition: alpha_wrap_3.h:94
CGAL::IO::read_polygon_soup
bool read_polygon_soup(const std::string &fname, PointRange &points, PolygonRange &polygons, const NamedParameters &np=parameters::default_values())
CGAL::square
NT square(const NT &x)
CGAL::IO::write_polygon_mesh
bool write_polygon_mesh(const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())