Lloydスムージング(CGALライブラリ)

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#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_image_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
#include <CGAL/Image_3.h>
 
#include <CGAL/IO/Complex_3_in_triangulation_3_to_vtk.h>
 
#include <vtkMetaImageReader.h>
#include <vtkSmartPointer.h>
#include <vtkUnstructuredGrid.h>
#include <vtkXMLUnstructuredGridWriter.h>
 
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Labeled_image_mesh_domain_3<CGAL::Image_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;
 
// To avoid verbose function and named parameters call
using namespace CGAL::parameters;
 
int main()
{
  // Loads image
  vtkSmartPointer<vtkMetaImageReader> reader =
    vtkSmartPointer<vtkMetaImageReader>::New();
  reader->SetFileName("data/image.mha");
  reader->Update();
 
  CGAL::Image_3 image;
  if (!image.read_vtk_image_data(reader->GetOutput()))
  {
    return 0;
  }
 
  // Domain
  Mesh_domain domain(image);
 
  // Mesh criteria
  Mesh_criteria criteria(facet_angle=30, facet_size=0.1, facet_distance=1,
                         cell_radius_edge_ratio=3, cell_size=0.1);
 
  // Meshing
  C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, no_perturb(), no_exude());
 
  CGAL::lloyd_optimize_mesh_3(c3t3, domain, time_limit=30);
  //CGAL::odt_optimize_mesh_3(c3t3, domain, time_limit=30);
  //CGAL::perturb_mesh_3(c3t3, domain, time_limit=10);
  //CGAL::exude_mesh_3(c3t3, sliver_bound=10, time_limit=10);
 
  // Output
  vtkSmartPointer<vtkUnstructuredGrid> output =
    vtkSmartPointer<vtkUnstructuredGrid>::New();
  CGAL::output_c3t3_to_vtk_unstructured_grid(c3t3, output);
 
  vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer =
    vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
  writer->SetFileName("out.vtu");
  writer->SetInput(output);
  writer->Update();
 
  return 0;
}