typedef CGAL::Exact_predicates_inexact_constructions_kernel K;

typedef CGAL::Polyhedron_3<K> Polyhedron;

typedef CGAL::Polyhedral_mesh_domain_3<Polyhedron, K> Mesh_domain;

typedef CGAL::Mesh_triangulation_3<

Mesh_domain,

CGAL::Kernel_traits<Mesh_domain>::Kernel, // Same as sequential

CGAL::Parallel_tag // Tag to activate parallelism

>::type Tr;

typedef CGAL::Mesh_triangulation_3<Mesh_domain>::type Tr;

typedef CGAL::Mesh_complex_3_in_triangulation_3<Tr> C3t3;

typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;

using namespace CGAL::parameters;

int main()

{

// Create input polyhedron

Polyhedron polyhedron;

std::ifstream input("data/elephant.off");

input >> polyhedron;

// Create domain

Mesh_domain domain(polyhedron);

// Mesh criteria (no cell_size set)

Mesh_criteria criteria(facet_angle=25, facet_size=0.15, facet_distance=0.008,

cell_radius_edge_ratio=3);

// Mesh generation

C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria, no_perturb(), no_exude());

// Output

std::ofstream medit_file("out_1.mesh");

c3t3.output_to_medit(medit_file);

medit_file.close();

// Set tetrahedron size (keep cell_radius_edge_ratio), ignore facets

Mesh_criteria new_criteria(cell_radius_edge_ratio=3, cell_size=0.03);

// Mesh refinement

CGAL::refine_mesh_3(c3t3, domain, new_criteria);

// Output

medit_file.open("out_2.mesh");

c3t3.output_to_medit(medit_file);

return 0;

}