\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - dD Spatial Searching

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Spatial_searching/searching_surface_mesh_vertices.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Search_traits_3.h>
#include <CGAL/Search_traits_adapter.h>
#include <CGAL/Orthogonal_k_neighbor_search.h>
#include <CGAL/Surface_mesh.h>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::Point_3 Point_3;
typedef CGAL::Surface_mesh<Point_3> Mesh;
typedef boost::graph_traits<Mesh>::vertex_descriptor Point;
typedef boost::graph_traits<Mesh>::vertices_size_type size_type;
typedef boost::property_map<Mesh,CGAL::vertex_point_t>::type Vertex_point_pmap;
typedef CGAL::Search_traits_3<Kernel> Traits_base;
typedef CGAL::Search_traits_adapter<Point,Vertex_point_pmap,Traits_base> Traits;
typedef CGAL::Orthogonal_k_neighbor_search<Traits> K_neighbor_search;
typedef K_neighbor_search::Tree Tree;
typedef Tree::Splitter Splitter;
typedef K_neighbor_search::Distance Distance;
int main(int argc, char* argv[]) {
Mesh mesh;
std::cerr << argc <<std::endl;
std::ifstream in((argc>1)?argv[1]:"data/tripod.off");
in >> mesh;
const unsigned int K = 5;
Vertex_point_pmap vppmap = get(CGAL::vertex_point,mesh);
// Insert number_of_data_points in the tree
Tree tree(
vertices(mesh).begin(),
vertices(mesh).end(),
Splitter(),
Traits(vppmap)
);
Point_3 query(0.0, 0.0, 0.0);
Distance tr_dist(vppmap);
// search K nearest neighbours
K_neighbor_search search(tree, query, K,0,true,tr_dist);
std::cout <<"The "<< K << " nearest vertices to the query point at (0,0,0) are:" << std::endl;
for(K_neighbor_search::iterator it = search.begin(); it != search.end(); it++){
std::cout << "vertex " << it->first << " : " << vppmap[it->first] << " at distance "
<< tr_dist.inverse_of_transformed_distance(it->second) << std::endl;
}
return 0;
}