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#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <iostream>
#include <fstream>
#include <CGAL/boost/graph/prim_minimum_spanning_tree.h>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_3 Point;
typedef CGAL::Surface_mesh<Point> Mesh;
typedef boost::graph_traits<Mesh>::vertex_descriptor vertex_descriptor;
int main(int argc, char* argv[])
{
const std::string filename = (argc>1) ? argv[1] : CGAL::data_file_path("meshes/prim.off");
Mesh P;
if(!CGAL::IO::read_polygon_mesh(filename, P))
{
std::cerr << "Invalid input." << std::endl;
return 1;
}
Mesh::Property_map<vertex_descriptor,vertex_descriptor> predecessor;
predecessor = P.add_property_map<vertex_descriptor,vertex_descriptor>("v:predecessor").first;
boost::prim_minimum_spanning_tree(P, predecessor, boost::root_vertex(*vertices(P).first));
std::cout << "#VRML V2.0 utf8\n"
"DirectionalLight {\n"
"direction 0 -1 0\n"
"}\n"
"Shape {\n"
" appearance Appearance {\n"
" material Material { emissiveColor 1 0 0}}\n"
" geometry\n"
" IndexedLineSet {\n"
" coord Coordinate {\n"
" point [ \n";
for(vertex_descriptor vd : vertices(P)){
std::cout << " " << P.point(vd) << "\n";
}
std::cout << " ]\n"
" }\n"
" coordIndex [\n";
for(vertex_descriptor vd : vertices(P)){
if(predecessor[vd]!=vd){
std::cout << " " << std::size_t(vd) << ", " << std::size_t(predecessor[vd]) << ", -1\n";
}
}
std::cout << "]\n"
" }#IndexedLineSet\n"
"}# Shape\n";
P.remove_property_map(predecessor);
return 0;
}
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