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#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/boost/graph/graph_traits_Surface_mesh.h>
#include <CGAL/subdivision_method_3.h>
#include <CGAL/Timer.h>
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <fstream>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef CGAL::Surface_mesh<Kernel::Point_3> PolygonMesh;
using namespace std;
using namespace CGAL;
namespace params = CGAL::parameters;
// ======================================================================
template <class Poly>
class WLoop_mask_3 {
typedef Poly PolygonMesh;
typedef typename boost::graph_traits<PolygonMesh>::vertex_descriptor vertex_descriptor;
typedef typename boost::graph_traits<PolygonMesh>::halfedge_descriptor halfedge_descriptor;
typedef typename boost::property_map<PolygonMesh, vertex_point_t>::type Vertex_pmap;
typedef typename boost::property_traits<Vertex_pmap>::value_type Point;
typedef typename boost::property_traits<Vertex_pmap>::reference Point_ref;
PolygonMesh& pmesh;
Vertex_pmap vpm;
public:
WLoop_mask_3(PolygonMesh& pmesh)
: pmesh(pmesh), vpm(get(CGAL::vertex_point, pmesh))
{}
void edge_node(halfedge_descriptor hd, Point& pt) {
Point_ref p1 = get(vpm, target(hd,pmesh));
Point_ref p2 = get(vpm, target(opposite(hd,pmesh),pmesh));
Point_ref f1 = get(vpm, target(next(hd,pmesh),pmesh));
Point_ref f2 = get(vpm, target(next(opposite(hd,pmesh),pmesh),pmesh));
pt = Point((3*(p1[0]+p2[0])+f1[0]+f2[0])/8,
(3*(p1[1]+p2[1])+f1[1]+f2[1])/8,
(3*(p1[2]+p2[2])+f1[2]+f2[2])/8 );
}
void vertex_node(vertex_descriptor vd, Point& pt) {
double R[] = {0.0, 0.0, 0.0};
Point_ref S = get(vpm,vd);
std::size_t n = 0;
for(halfedge_descriptor hd : halfedges_around_target(vd, pmesh)){
++n;
Point_ref p = get(vpm, target(opposite(hd,pmesh),pmesh));
R[0] += p[0]; R[1] += p[1]; R[2] += p[2];
}
if (n == 6) {
pt = Point((10*S[0]+R[0])/16, (10*S[1]+R[1])/16, (10*S[2]+R[2])/16);
} else if (n == 3) {
double B = (5.0/8.0 - std::sqrt(3+2*std::cos(6.283/n))/64.0)/n;
double A = 1-n*B;
pt = Point((A*S[0]+B*R[0]), (A*S[1]+B*R[1]), (A*S[2]+B*R[2]));
} else {
double B = 3.0/8.0/n;
double A = 1-n*B;
pt = Point((A*S[0]+B*R[0]), (A*S[1]+B*R[1]), (A*S[2]+B*R[2]));
}
}
void border_node(halfedge_descriptor hd, Point& ept, Point& vpt) {
Point_ref ep1 = get(vpm, target(hd,pmesh));
Point_ref ep2 = get(vpm, target(opposite(hd,pmesh),pmesh));
ept = Point((ep1[0]+ep2[0])/2, (ep1[1]+ep2[1])/2, (ep1[2]+ep2[2])/2);
Halfedge_around_target_circulator<Poly> vcir(hd,pmesh);
Point_ref vp1 = get(vpm, target(opposite(*vcir,pmesh),pmesh));
Point_ref vp0 = get(vpm, target(*vcir,pmesh));
--vcir;
Point_ref vp_1 = get(vpm,target(opposite(*vcir,pmesh),pmesh));
vpt = Point((vp_1[0] + 6*vp0[0] + vp1[0])/8,
(vp_1[1] + 6*vp0[1] + vp1[1])/8,
(vp_1[2] + 6*vp0[2] + vp1[2])/8 );
}
};
int main(int argc, char **argv) {
if (argc > 4) {
cerr << "Usage: Customized_subdivision [d] [filename_in] [filename_out] \n";
cerr << " d -- the depth of the subdivision (default: 1) \n";
cerr << " filename_in -- the input mesh (.off) (default: data/quint_tris.off) \n";
cerr << " filename_out -- the output mesh (.off) (default: result.off)" << endl;
return 1;
}
int d = (argc > 1) ? boost::lexical_cast<int>(argv[1]) : 1;
const std::string in_file = (argc > 2) ? argv[2] : CGAL::data_file_path("meshes/quint_tris.off");
const char* out_file = (argc > 3) ? argv[3] : "result.off";
PolygonMesh pmesh;
std::ifstream in(in_file);
if(in.fail()) {
std::cerr << "Could not open input file " << in_file << std::endl;
return 1;
}
in >> pmesh;
Timer t;
t.start();
Subdivision_method_3::PTQ(pmesh, WLoop_mask_3<PolygonMesh>(pmesh), params::number_of_iterations(d));
std::cerr << "Done (" << t.time() << " s)" << std::endl;
std::ofstream out(out_file);
out << pmesh;
return 0;
}
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