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#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_mesh_processing/transform.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/corefinement.h>
#include <CGAL/Polygon_mesh_processing/repair.h>
#include <tbb/parallel_for.h>
#include <tbb/blocked_range.h>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::Point_3 Point_3;
typedef Kernel::Aff_transformation_3 Aff_transformation_3;
typedef CGAL::Surface_mesh<Point_3> Mesh;
namespace PMP = CGAL::Polygon_mesh_processing;
int main(int argc, char** argv)
{
std::ifstream in(argc>1?argv[1]:CGAL::data_file_path("meshes/eight.off"));
int nb_copies = argc > 2 ? atoi(argv[2]) : 100;
if (nb_copies<=0) return 1;
std::vector<Mesh> meshes(nb_copies);
in >> meshes[0];
for (int i=1; i<nb_copies; ++i)
{
Aff_transformation_3 trans(CGAL::Translation(), Kernel::Vector_3(i*0.2, 0, 0));
meshes[i]=meshes[0];
PMP::transform(trans, meshes[i]);
}
// lambda function used to do the union of two meshes:
// we join the left part of the mesh vector with the right part
// as the right part will be discarded by the resize in the while loop
auto f = [&meshes](const tbb::blocked_range<std::size_t>& range)
{
for( std::size_t k = range.begin(); k != range.end(); ++k)
{
PMP::corefine_and_compute_union(meshes[k], meshes[meshes.size() - k - 1], meshes[k]);
}
};
// do the union of meshes in parallel
while (meshes.size()>1)
{
tbb::parallel_for(tbb::blocked_range<std::size_t>(0, meshes.size()/2), f);
meshes.resize((meshes.size() + 1) / 2);
}
std::ofstream out("multiple_union.off");
out << std::setprecision(17) << meshes[0];
return 0;
}
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