mirror of https://github.com/CGAL/cgal
69 lines
2.9 KiB
C++
69 lines
2.9 KiB
C++
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
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#include <CGAL/Surface_mesh.h>
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#include <CGAL/Octree.h>
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#include <CGAL/Orthtree_traits_face_graph.h>
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#include <CGAL/boost/graph/IO/polygon_mesh_io.h>
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using K = CGAL::Exact_predicates_inexact_constructions_kernel;
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using Mesh = CGAL::Surface_mesh<K::Point_3>;
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using OTraits = CGAL::Orthtree_traits_face_graph<Mesh, Mesh::Property_map<Mesh::Vertex_index, K::Point_3>>;
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using Octree = CGAL::Orthtree<OTraits>;
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void dump_as_polylines(const Octree& ot)
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{
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std::ofstream out("octree.polylines.txt");
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for (Octree::Node_index node : ot.traverse(CGAL::Orthtrees::Leaves_traversal<Octree>(ot)))
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{
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if (!ot.is_leaf(node))
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continue;
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auto bb = ot.bbox(node);
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out << "2 " << bb.xmin() << " " << bb.ymin() << " " << bb.zmin()
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<< " " << bb.xmax() << " " << bb.ymin() << " " << bb.zmin() << "\n";
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out << "2 " << bb.xmin() << " " << bb.ymin() << " " << bb.zmin()
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<< " " << bb.xmin() << " " << bb.ymax() << " " << bb.zmin() << "\n";
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out << "2 " << bb.xmax() << " " << bb.ymin() << " " << bb.zmin()
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<< " " << bb.xmax() << " " << bb.ymax() << " " << bb.zmin() << "\n";
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out << "2 " << bb.xmin() << " " << bb.ymax() << " " << bb.zmin()
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<< " " << bb.xmax() << " " << bb.ymax() << " " << bb.zmin() << "\n";
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//
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out << "2 " << bb.xmin() << " " << bb.ymin() << " " << bb.zmin()
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<< " " << bb.xmin() << " " << bb.ymin() << " " << bb.zmax() << "\n";
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out << "2 " << bb.xmax() << " " << bb.ymin() << " " << bb.zmin()
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<< " " << bb.xmax() << " " << bb.ymin() << " " << bb.zmax() << "\n";
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out << "2 " << bb.xmin() << " " << bb.ymax() << " " << bb.zmin()
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<< " " << bb.xmin() << " " << bb.ymax() << " " << bb.zmax() << "\n";
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out << "2 " << bb.xmax() << " " << bb.ymax() << " " << bb.zmin()
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<< " " << bb.xmax() << " " << bb.ymax() << " " << bb.zmax() << "\n";
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//
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out << "2 " << bb.xmin() << " " << bb.ymin() << " " << bb.zmax()
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<< " " << bb.xmax() << " " << bb.ymin() << " " << bb.zmax() << "\n";
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out << "2 " << bb.xmin() << " " << bb.ymin() << " " << bb.zmax()
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<< " " << bb.xmin() << " " << bb.ymax() << " " << bb.zmax() << "\n";
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out << "2 " << bb.xmax() << " " << bb.ymin() << " " << bb.zmax()
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<< " " << bb.xmax() << " " << bb.ymax() << " " << bb.zmax() << "\n";
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out << "2 " << bb.xmin() << " " << bb.ymax() << " " << bb.zmax()
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<< " " << bb.xmax() << " " << bb.ymax() << " " << bb.zmax() << "\n";
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}
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}
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int main(int argc, char** argv)
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{
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const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/elephant.off");
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Mesh mesh;
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if(!CGAL::IO::read_polygon_mesh(filename, mesh))
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{
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std::cerr << "Error: cannot read file" << std::endl;
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return EXIT_FAILURE;
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}
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Octree tree(mesh, mesh.points());
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OTraits::Split_predicate_node_min_extent sp(0.01);
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tree.refine(sp);
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dump_as_polylines(tree);
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}
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