CGAL 6.2 - 3D Mesh Generation

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Mesh_3/mesh_3D_gray_vtk_image.cpp
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkDICOMImageReader.h>
#include <vtkNIFTIImageReader.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>
#include <filesystem>
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;
template <bool less_than_iso>
class Is_interior {
double iso;
public:
Is_interior(double iso): iso(iso) {}
template <typename T>
int operator()(T v) const {
return int( (v < iso) == less_than_iso);
}
};
namespace fs = std::filesystem;
int main(int argc, char* argv[])
{
// Loads image
// Usage: mesh_3D_gray_vtk_image <nii file or dicom directory> iso_level=1 facet_size=1 facet_distance=0.1 cell_size=1 interior_less_than_isolevel=true
const std::string fname = (argc>1)?argv[1]:CGAL::data_file_path("images/squircle.nii");
vtkSmartPointer<vtkImageData> vtk_image = nullptr;
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;
bool less = (argc>6)? boost::lexical_cast<bool>(argv[6]): true;
fs::path path(fname);
if(fs::is_regular_file(path)){
std::cout << "regular file" << std::endl;
if (path.has_extension()){
fs::path stem = path.stem();
if ((path.extension() == ".nii") || (stem.has_extension() && (stem.extension() == ".nii") && (path.extension() == ".gz"))) {
auto reader = vtkSmartPointer<vtkNIFTIImageReader>::New();
reader->SetFileName(fname.c_str());
reader->Update();
vtk_image = reader->GetOutput();
vtk_image->Print(std::cerr);
}
}
}
else if (fs::is_directory(path)) {
auto dicom_reader = vtkSmartPointer<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
}
auto smoother = vtkSmartPointer<vtkImageGaussianSmooth>::New();
smoother->SetStandardDeviations(1., 1., 1.);
smoother->SetInputConnection(dicom_reader->GetOutputPort());
smoother->Update();
vtk_image = smoother->GetOutput();
vtk_image->Print(std::cerr);
}
if(vtk_image == nullptr){
std::cout << "No image loaded" << std::endl;
return 0;
}
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 = less ? Mesh_domain::create_gray_image_mesh_domain(image,
params::image_values_to_subdomain_indices(Is_interior<true>(iso)).
value_outside(iso+1))
: Mesh_domain::create_gray_image_mesh_domain(image,
params::image_values_to_subdomain_indices(Is_interior<false>(iso)).
value_outside(iso+1));
// 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 holds a shared pointer to a 3D image buffer.
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:53
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:186
unspecified_type
CGAL::IO::write_MEDIT
void write_MEDIT(std::ostream &os, const T3 &t3, const NamedParameters &np=parameters::default_values())
CGAL::parameters