CGAL 6.0.1 - 3D Mesh Generation
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Mesh_3/mesh_3D_image_with_custom_initialization.cpp
#include "random_labeled_image.h"
#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 <CGAL/SMDS_3/Dump_c3t3.h>
#include <CGAL/Mesh_3/Detect_features_on_image_bbox.h>
// Domain
typedef CGAL::Labeled_mesh_domain_3<K> Image_domain;
#ifdef CGAL_CONCURRENT_MESH_3
typedef CGAL::Parallel_tag Concurrency_tag;
#else
typedef CGAL::Sequential_tag Concurrency_tag;
#endif
// Triangulation
// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;
namespace params = CGAL::parameters;
// Custom_initial_points_generator will put points on the mesh for initialisation.
// Those points are objects of type std::tuple<Weighted_point_3, int, Index>.
// Weighted_point_3 is the point's position and weight,
// int is the dimension of the minimal dimension subcomplex on which the point lies,
// Index is the underlying subcomplex index.
struct Custom_initial_points_generator
{
const CGAL::Image_3& image_;
template <typename OutputIterator>
OutputIterator operator()(OutputIterator pts, int n = 20) const
{
typedef Tr::Geom_traits Gt;
typedef Gt::Point_3 Point_3;
typedef Gt::Vector_3 Vector_3;
typedef Gt::Segment_3 Segment_3;
typedef Mesh_domain::Index Index;
Gt::Construct_weighted_point_3 cwp = Gt().construct_weighted_point_3_object();
// Add points along the segment
Segment_3 segment(Point_3( 0.0, 50.0, 66.66),
Point_3(100.0, 50.0, 66.66));
Point_3 source = segment.source();
Vector_3 vector = segment.to_vector();
double edge_size = 5;
std::size_t nb = static_cast<int>(CGAL::sqrt(segment.squared_length()) / edge_size);
const double frac = 1. / (double)nb;
for (std::size_t i = 1; i < nb; i++)
{
*pts++ = std::make_tuple( cwp(source + (i * frac) * vector), 1, Index(1) );
}
return pts;
}
};
int main()
{
const std::string fname = CGAL::data_file_path("images/420.inr");
// Loads image
if(!image.read(fname)){
std::cerr << "Error: Cannot read file " << fname << std::endl;
return EXIT_FAILURE;
}
// Domain
Mesh_domain domain = Mesh_domain::create_labeled_image_mesh_domain(image
, params::features_detector(CGAL::Mesh_3::Detect_features_on_image_bbox()));
// Mesh criteria
Mesh_criteria criteria(params::facet_angle(30).facet_size(3).facet_distance(1).edge_size(3)
.cell_radius_edge_ratio(3).cell_size(3));
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria
, params::initial_points_generator(Custom_initial_points_generator{ image }));
// Output
CGAL::dump_c3t3(c3t3, "out");
return 0;
}
The class Image_3 is a C++ wrapper around the InrImage library.
Definition: Image_3.h:11
bool read(const char *file)
Open a 3D image file.
The class Labeled_mesh_domain_3 implements indexed domains.
Definition: Labeled_mesh_domain_3.h:359
The class gathers the refinement criteria for mesh tetrahedra and surface facets where surface facets...
Definition: Mesh_criteria_3.h:186
The class Mesh_domain_with_polyline_features_3 enables the user to add some 0- and 1-dimensional feat...
Definition: Mesh_domain_with_polyline_features_3.h:535
NT sqrt(const NT &x)
std::string data_file_path(const std::string &filename)
Functor for feature detection in labeled images.
Definition: Detect_features_on_image_bbox.h:76