CGAL 5.6.2 - Shape Detection
Shape_detection/region_growing_lines_on_segment_set.cpp
#include <CGAL/IO/PLY.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Shape_detection/Region_growing/Region_growing.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/boost/graph/IO/polygon_mesh_io.h>
#include "include/utils.h"
// Typedefs.
using Point_3 = typename Kernel::Point_3;
using Surface_mesh = CGAL::Surface_mesh<Point_3>;
using Face_range = typename Surface_mesh::Face_range;
using Edge_range = typename Surface_mesh::Edge_range;
using Segment_range = typename Polyline_graph::Segment_range;
using Segment_map = typename Polyline_graph::Segment_map;
int main(int argc, char *argv[]) {
// Load data either from a local folder or a user-provided file.
const bool is_default_input = argc > 1 ? false : true;
const std::string filename = is_default_input ? CGAL::data_file_path("meshes/am.off") : argv[1];
Surface_mesh surface_mesh;
if (!CGAL::IO::read_polygon_mesh(filename, surface_mesh)) {
std::cerr << "ERROR: cannot read the input file!" << std::endl;
return EXIT_FAILURE;
}
const Face_range face_range = faces(surface_mesh);
const Edge_range edge_range = edges(surface_mesh);
std::cout << "* number of input faces: " << face_range.size() << std::endl;
std::cout << "* number of input edges: " << edge_range.size() << std::endl;
assert(!is_default_input || face_range.size() == 7320);
assert(!is_default_input || edge_range.size() == 10980);
// Find planar regions.
One_ring_query one_ring_query(surface_mesh);
Plane_region plane_region(surface_mesh);
RG_planes rg_planes(face_range, one_ring_query, plane_region);
std::vector<typename RG_planes::Primitive_and_region> regions;
rg_planes.detect(std::back_inserter(regions));
std::cout << "* number of found planar regions: " << regions.size() << std::endl;
assert(!is_default_input || regions.size() == 9);
std::string fullpath = (argc > 2 ? argv[2] : "regions_sm.ply");
utils::save_polygon_mesh_regions(surface_mesh, regions, fullpath);
// Find linear regions.
Polyline_graph pgraph(surface_mesh, rg_planes.region_map());
const auto& segment_range = pgraph.segment_range();
std::cout << "* number of extracted segments: " << segment_range.size() << std::endl;
Line_region line_region(CGAL::parameters::segment_map(pgraph.segment_map()));
Line_sorting line_sorting(
segment_range, pgraph, CGAL::parameters::segment_map(pgraph.segment_map()));
line_sorting.sort();
RG_lines rg_lines(
segment_range, line_sorting.ordered(), pgraph, line_region);
std::vector<typename RG_lines::Primitive_and_region> subregions;
rg_lines.detect(std::back_inserter(subregions));
std::cout << "* number of found linear regions: " << subregions.size() << std::endl;
assert(!is_default_input || subregions.size() == 21);
fullpath = (argc > 2 ? argv[2] : "subregions_sm.ply");
utils::save_segment_regions_3<Kernel, std::vector<typename RG_lines::Primitive_and_region>, Segment_map>(
subregions, fullpath, pgraph.segment_map());
return EXIT_SUCCESS;
}