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
|
#define CGAL_BGL_TESTSUITE
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/Mesh/PolyMesh_ArrayKernelT.hh>
#include <CGAL/boost/graph/graph_traits_PolyMesh_ArrayKernelT.h>
#include <CGAL/mesh_segmentation.h>
#include <CGAL/property_map.h>
#include <iostream>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef OpenMesh::PolyMesh_ArrayKernelT</* MyTraits*/> Mesh;
typedef boost::graph_traits<Mesh>::face_descriptor face_descriptor;
typedef boost::graph_traits<Mesh>::face_iterator face_iterator;
int main(int argc, char** argv )
{
Mesh mesh;
if (argc==2)
OpenMesh::IO::read_mesh(mesh, argv[1]);
else
OpenMesh::IO::read_mesh(mesh, "data/cactus.off");
// create a property-map for SDF values
typedef std::map<face_descriptor, double> Facet_double_map;
Facet_double_map internal_sdf_map;
boost::associative_property_map<Facet_double_map> sdf_property_map(internal_sdf_map);
typedef boost::property_map<Mesh, boost::vertex_point_t>::type Ppmap;
Ppmap ppmap(mesh);
// compute SDF values
// We can't use default parameters for number of rays, and cone angle
// and the postprocessing
CGAL::sdf_values(mesh, sdf_property_map, 2.0 / 3.0 * CGAL_PI, 25, true, ppmap);
// create a property-map for segment-ids
typedef std::map<face_descriptor, std::size_t> Facet_int_map;
Facet_int_map internal_segment_map;
boost::associative_property_map<Facet_int_map> segment_property_map(internal_segment_map);
// segment the mesh using default parameters for number of levels, and smoothing lambda
// Any other scalar values can be used instead of using SDF values computed using the CGAL function
std::size_t number_of_segments = CGAL::segmentation_from_sdf_values(mesh, sdf_property_map, segment_property_map);
std::cout << "Number of segments: " << number_of_segments << std::endl;
// print segment-ids
face_iterator facet_it, fend;
for(boost::tie(facet_it,fend) = faces(mesh);
facet_it != fend; ++facet_it) {
// ids are between [0, number_of_segments -1]
std::cout << segment_property_map[*facet_it] << " ";
}
std::cout << std::endl;
const std::size_t number_of_clusters = 4; // use 4 clusters in soft clustering
const double smoothing_lambda = 0.3; // importance of surface features, suggested to be in-between [0,1]
// Note that we can use the same SDF values (sdf_property_map) over and over again for segmentation.
// This feature is relevant for segmenting the mesh several times with different parameters.
CGAL::segmentation_from_sdf_values(mesh, sdf_property_map, segment_property_map, number_of_clusters, smoothing_lambda);
}
|
