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#include "output_helper.h"
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/alpha_wrap_3.h>
#include <CGAL/IO/read_points.h>
#include <CGAL/Real_timer.h>
#include <iostream>
#include <string>
using K = CGAL::Exact_predicates_inexact_constructions_kernel;
using Point_3 = K::Point_3;
using Point_container = std::vector<Point_3>;
using Mesh = CGAL::Surface_mesh<Point_3>;
int main(int argc, char** argv)
{
// Read the input
const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("points_3/oni.pwn");
std::cout << "Reading " << filename << "..." << std::endl;
Point_container points;
if(!CGAL::IO::read_points(filename, std::back_inserter(points)) || points.empty())
{
std::cerr << "Invalid input:" << filename << std::endl;
return EXIT_FAILURE;
}
std::cout << points.size() << " points" << std::endl;
// Compute the alpha and offset values
const double relative_alpha = (argc > 2) ? std::stod(argv[2]) : 10.;
const double relative_offset = (argc > 3) ? std::stod(argv[3]) : 300.;
CGAL::Bbox_3 bbox = CGAL::bbox_3(std::cbegin(points), std::cend(points));
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;
std::cout << "absolute alpha = " << alpha << " absolute offset = " << offset << std::endl;
// Construct the wrap
CGAL::Real_timer t;
t.start();
Mesh wrap;
CGAL::alpha_wrap_3(points, 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
const std::string output_name = generate_output_name(filename, relative_alpha, relative_offset);
std::cout << "Writing to " << output_name << std::endl;
CGAL::IO::write_polygon_mesh(output_name, wrap, CGAL::parameters::stream_precision(17));
return EXIT_SUCCESS;
}
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