1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#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;
namespace params = 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 std::string fname = (argc>1)?argv[1]:CGAL::data_file_path("images/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 < 2) {
iso_values.insert(1.5f);
iso_values.insert(2.9f);
iso_values.insert(3.5f);
} else {
for(int i = 2; i < argc; ++i) {
iso_values.insert(static_cast<float>(std::atof(argv[i])));
}
}
// Domain
Mesh_domain domain =
Mesh_domain::create_gray_image_mesh_domain
(params::image(image).
image_values_to_subdomain_indices(
Image_to_multiple_iso_level_sets<Flat_set>(iso_values)).
value_outside(0.f)
);
// Mesh criteria
Mesh_criteria criteria(params::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");
CGAL::IO::write_MEDIT(medit_file, c3t3);
medit_file.close();
return 0;
}
|
