CGAL 5.6.3 - 3D Mesh Generation

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Mesh_3/mesh_3D_gray_vtk_image.cpp
#include <vtkImageData.h>
#include <vtkDICOMImageReader.h>
#include <vtkImageReader.h>
#include <vtkImageGaussianSmooth.h>
#include <vtkDemandDrivenPipeline.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/IO/read_vtk_image_data.h>
#include <boost/lexical_cast.hpp>
#include <boost/functional.hpp>
typedef short 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;
class Less {
double iso;
public:
Less(double iso): iso(iso) {}
template <typename T>
int operator()(T v) const {
return int(v < iso);
}
};
int main(int argc, char* argv[])
{
// Loads image
if(argc == 1){
std::cerr << "Usage: " << argv[0] << " <directory with dicom data> iso_level=1 facet_size=1 facet_distance=0.1 cell_size=1\n";
return 0;
}
Image_word_type iso = (argc>2)? boost::lexical_cast<Image_word_type>(argv[2]): 1;
double fs = (argc>3)? boost::lexical_cast<double>(argv[3]): 1;
double fd = (argc>4)? boost::lexical_cast<double>(argv[4]): 0.1;
double cs = (argc>5)? boost::lexical_cast<double>(argv[5]): 1;
vtkDICOMImageReader*dicom_reader = vtkDICOMImageReader::New();
dicom_reader->SetDirectoryName(argv[1]);
vtkDemandDrivenPipeline*executive =
vtkDemandDrivenPipeline::SafeDownCast(dicom_reader->GetExecutive());
if (executive)
{
executive->SetReleaseDataFlag(0, 0); // where 0 is the port index
}
vtkImageGaussianSmooth* smoother = vtkImageGaussianSmooth::New();
smoother->SetStandardDeviations(1., 1., 1.);
smoother->SetInputConnection(dicom_reader->GetOutputPort());
smoother->Update();
vtkImageData* vtk_image = smoother->GetOutput();
vtk_image->Print(std::cerr);
CGAL::Image_3 image = CGAL::IO::read_vtk_image_data(vtk_image);
if(image.image() == nullptr){
std::cerr << "could not create a CGAL::Image_3 from the vtk image\n";
return 0;
}
namespace params = CGAL::parameters;
Mesh_domain domain = Mesh_domain::create_gray_image_mesh_domain
(image,
params::image_values_to_subdomain_indices(Less(iso)).
value_outside(0));
// Mesh criteria
Mesh_criteria criteria(params::facet_angle(30).facet_size(fs).facet_distance(fd).
cell_radius_edge_ratio(3).cell_size(cs));
// 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;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Image_3
The class Image_3 is a C++ wrapper around the InrImage library.
Definition: Image_3.h:11
CGAL::Labeled_mesh_domain_3
The class Labeled_mesh_domain_3 implements indexed domains.
Definition: Labeled_mesh_domain_3.h:357
CGAL::Mesh_complex_3_in_triangulation_3
CGAL::Mesh_criteria_3
The class gathers the refinement criteria for mesh tetrahedra and surface facets where surface facets...
Definition: Mesh_criteria_3.h:192
unspecified_type
CGAL::IO::write_MEDIT
void write_MEDIT(std::ostream &os, const T3 &t3, const NamedParameters &np=parameters::default_values())
CGAL::parameters