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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Mesh_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/Mesh_criteria_3.h>
#include <CGAL/Labeled_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/Image_3.h>
#include <cstdlib>
#include <iostream>
#include <boost/container/flat_set.hpp>
typedef float Image_word_type;
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Labeled_mesh_domain_3<K> Mesh_domain;
// Triangulation
typedef CGAL::Mesh_triangulation_3<Mesh_domain>::type Tr;
typedef CGAL::Mesh_complex_3_in_triangulation_3<Tr> C3t3;
// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
// To avoid verbose function and named parameters call
using namespace CGAL::parameters;
template <typename Set>
struct Image_to_multiple_iso_level_sets {
const Set& set;
Image_to_multiple_iso_level_sets(const Set& set) : set(set) {}
int operator()(double v) const {
return int(std::distance(set.begin(),
set.lower_bound(float(v))));
}
};
int main(int argc, char*argv[])
{
const char* fname = (argc>1)?argv[1]:"data/skull_2.9.inr";
// Load image
CGAL::Image_3 image;
if(!image.read(fname)){
std::cerr << "Error: Cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
typedef boost::container::flat_set<float> Flat_set;
Flat_set iso_values;
if(argc < 3) {
iso_values.insert(2.9f);
} else {
for(int i = 2; i < argc; ++i) {
iso_values.insert(static_cast<float>(std::atof(argv[i])));
}
}
// Domain
namespace p = CGAL::parameters;
Mesh_domain domain =
Mesh_domain::create_gray_image_mesh_domain
(p::image = image,
p::image_values_to_subdomain_indices =
Image_to_multiple_iso_level_sets<Flat_set>(iso_values),
p::value_outside = 0.f
);
// Mesh criteria
Mesh_criteria criteria(facet_angle=30, facet_size=6, facet_distance=2,
cell_radius_edge_ratio=3, cell_size=8);
// Meshing
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria);
// Output
std::ofstream medit_file("out.mesh");
c3t3.output_to_medit(medit_file);
return 0;
}
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