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// Copyright (C) 2014 Benjamin Kehlet
//
// This file is part of mshr.
//
// mshr is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// mshr is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with mshr. If not, see <http://www.gnu.org/licenses/>.
//
#include <mshr.h>
#include <dolfin.h>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/variables_map.hpp>
#include <boost/program_options/parsers.hpp>
#include <boost/filesystem.hpp>
#include <string>
#include <iostream>
namespace po = boost::program_options;
// This program reads in a surface from file and generates mesh
namespace
{
void print_mesh_statistics(const dolfin::Mesh& m)
{
std::cout << "Dolfin mesh of topological dimension " << m.topology().dim() << std::endl;
std::cout << " " << m.num_vertices() << " vertices" << std::endl;
std::cout << " " << m.num_cells() << " cells" << std::endl;
const std::pair<double, double> volume_min_max = mshr::DolfinMeshUtils::cell_volume_min_max(m);
std::cout << "Min cell volume: " << volume_min_max.first << std::endl;
std::cout << "Max cell volume: " << volume_min_max.second << std::endl;
const std::pair<double, double> radii_ratio = dolfin::MeshQuality::radius_ratio_min_max(m);
std::cout << "Minimum cell radii ratio: " << radii_ratio.first << std::endl;
std::cout << "Maximum cell radii ratio: " << radii_ratio.second << std::endl;
}
//-----------------------------------------------------------------------------
// Define options and parse command line
void handle_commandline(int argc, char** argv, po::variables_map &vm)
{
// Command line options
po::options_description visible("Generate mesh from surface file");
visible.add_options()
("outfile,o", po::value<std::string>(), "Filename of generated Dolfin mesh")
("resolution,r", po::value<double>()->default_value(15.0), "Resolution of result mesh")
("stats,s", "Write some statistics of the mesh to stdout")
("polyout", po::value<std::string>(), "Write the polyhedron to a .off file (and do not create a mesh)")
("polystats", "Write statistics of polyhedron (and do not create a mesh")
("backend,b", po::value<std::string>()->default_value("cgal"), "Use 3D mesh generation backend [tetgen|cgal]")
("degenerate_tolerance", po::value<double>()->default_value(1e-12), "Tolerance for considering a facet as degenerate. Set to 0 to not remove degenerate facets")
("check-mesh", "Check consistency of output mesh (most for debugging/testing")
("verbose,v", "Output more information about what is going on")
("help,h", "write help message");
// Options not shown to the user
po::options_description hidden("Hidden options");
hidden.add_options()
("input-file", po::value<std::string>(), "Input file")
;
po::options_description cmdline("Generate mesh from surface file");
cmdline.add(visible).add(hidden);
//Command line positional arguments
po::positional_options_description p;
p.add("input-file", 1);
// parse command line
po::store(po::command_line_parser(argc, argv)
.options(cmdline)
.positional(p).run(), vm);
// Print help message if requested
// (before notify to avoid error messages if only --help is given)
if (vm.count("help"))
{
std::cout << visible << std::endl;
exit(EXIT_SUCCESS);
}
po::notify(vm);
}
} //end anonymous namespace
//-----------------------------------------------------------------------------
int main(int argc, char** argv)
{
// Ensure Dolfin initializes MPI correctly.
#ifdef HAS_MPI
dolfin::SubSystemsManager::init_mpi();
#endif
po::variables_map vm;
handle_commandline(argc, argv, vm);
if (vm.count("verbose"))
dolfin::set_log_level(dolfin::TRACE);
// Read the infile
if (!boost::filesystem::exists(vm["input-file"].as<std::string>()))
{
std::cerr << "File " << vm["input-file"].as<std::string>() << "does not exist" << std::endl;
exit(1);
}
std::shared_ptr<mshr::Surface3D> surf(new mshr::Surface3D(vm["input-file"].as<std::string>()));
surf->degenerate_tolerance = vm["degenerate_tolerance"].as<double>();
// Operations that disable mesh generation
if (vm.count("polyout") || vm.count("polystats"))
{
mshr::CSGCGALDomain3D domain(surf);
if (vm.count("polyout"))
{
std::string extension = boost::filesystem::extension(vm["polyout"].as<std::string>());
if (extension != ".off")
{
std::cerr << "Unknown file type: " << extension << std::endl;
exit(1);
}
domain.save_off(vm["polyout"].as<std::string>());
}
if (vm.count("polystats"))
std::cout << domain.str(true) << std::endl;
exit(EXIT_SUCCESS);
}
// Generate the mesh
std::shared_ptr<dolfin::Mesh> m = mshr::generate_mesh(surf,
vm["resolution"].as<double>(),
vm["backend"].as<std::string>());
// Output mesh if requested
if (vm.count("outfile"))
{
dolfin::File f(vm["outfile"].as<std::string>());
f << *m;
}
if (vm.count("stats"))
print_mesh_statistics(*m);
if (vm.count("check-mesh"))
{
if (!mshr::DolfinMeshUtils::check_mesh(*m))
{
std::cout << " Error: Mesh check failed" << std::endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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