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Added an example that showcase use of optimizers

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Mael Rouxel-Labbé 2017-12-01 19:09:08 +01:00
parent 1e2d920658
commit dd24c82343
1 changed files with 98 additions and 0 deletions
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Periodic_3_mesh_3/examples/Periodic_3_mesh_3/mesh_implicit_shape_with_optimizers.cpp Normal file
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#define CGAL_MESH_3_VERBOSE
//#define CGAL_MESHES_DEBUG_REFINEMENT_POINTS
//#define CGAL_MESH_3_DEBUG_FACET_CRITERIA
//#define CGAL_MESH_3_DEBUG_CELL_CRITERIA
#define CGAL_MESH_3_PROFILING
#define CGAL_MESH_3_DEBUG_SLIVERS_EXUDER
#include <CGAL/Periodic_3_mesh_3/config.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/IO/Medit_IO.h>
#include <CGAL/Implicit_periodic_3_mesh_domain_3.h>
#include <CGAL/make_periodic_3_mesh_3.h>
#include <CGAL/optimize_periodic_3_mesh_3.h>
#include <CGAL/Periodic_3_mesh_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/Mesh_criteria_3.h>
#include <CGAL/number_type_config.h> // CGAL_PI
#include <cmath>
#include <iostream>
#include <fstream>
namespace P3M3_IO = CGAL::Periodic_3_mesh_3::IO;
// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::FT FT;
typedef K::Point_3 Point;
typedef FT (Function)(const Point&);
typedef CGAL::Implicit_periodic_3_mesh_domain_3<Function,K> Periodic_mesh_domain;
// Triangulation
typedef CGAL::Periodic_3_mesh_triangulation_3<Periodic_mesh_domain>::type Tr;
typedef CGAL::Mesh_complex_3_in_triangulation_3<Tr> C3t3;
// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Periodic_mesh_criteria;
// To avoid verbose function and named parameters call
using namespace CGAL::parameters;
// Implicit function
FT schwarz_p(const Point& p) {
const FT x2 = std::cos( p.x() * 2 * CGAL_PI ),
y2 = std::cos( p.y() * 2 * CGAL_PI ),
z2 = std::cos( p.z() * 2 * CGAL_PI );
return x2 + y2 + z2;
}
int main(int argc, char** argv)
{
// 'int' because the 'schwarz_p' function is periodic over the domain only if
// the length of the side of the domain is an integer
int domain_size = (argc > 1) ? atoi(argv[1]) : 1;
Periodic_mesh_domain domain(schwarz_p, CGAL::Iso_cuboid_3<K>(0, 0, 0, domain_size, domain_size, domain_size));
Periodic_mesh_criteria criteria(facet_angle = 30,
facet_size = 0.05 * domain_size,
facet_distance = 0.025 * domain_size,
cell_radius_edge_ratio = 2.,
cell_size = 0.05);
// Mesh generation
C3t3 c3t3 = CGAL::make_periodic_3_mesh_3<C3t3>(domain, criteria,
odt(convergence=0.03, freeze_bound=0.02, time_limit=30),
lloyd(max_iteration_number=10, time_limit=30),
perturb(sliver_bound=10),
exude(sliver_bound=10, time_limit=30));
std::ofstream medit_file("output_implicit_shape.mesh");
P3M3_IO::write_complex_to_medit(medit_file, c3t3);
// Mesh generation and optimization in several call
C3t3 c3t3_bis = CGAL::make_periodic_3_mesh_3<C3t3>(domain, criteria,
no_odt(), no_lloyd(),
no_perturb(), no_exude());
std::ofstream medit_file_bis("output_implicit_shape_non-optimized.mesh");
P3M3_IO::write_complex_to_medit(medit_file_bis, c3t3_bis);
std::cout << "Optimizing..." << std::endl;
CGAL::odt_optimize_periodic_3_mesh_3(c3t3_bis, domain, convergence=0.03, freeze_bound=0.02, time_limit=30);
CGAL::lloyd_optimize_periodic_3_mesh_3(c3t3_bis, domain, max_iteration_number=10, time_limit=30);
CGAL::perturb_periodic_3_mesh_3(c3t3_bis, domain, sliver_bound=10);
CGAL::exude_periodic_3_mesh_3(c3t3_bis, sliver_bound=10, time_limit=30);
std::ofstream medit_file_ter("output_implicit_shape_two_steps.mesh");
P3M3_IO::write_complex_to_medit(medit_file_ter, c3t3_bis);
std::cout << "EXIT SUCCESS" << std::endl;
return 0;
}