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

CGAL 4.8 - Polygon Mesh Processing

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Polygon_mesh_processing/compute_normals_example.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Polygon_mesh_processing/compute_normal.h>
#include <iostream>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_3 Point;
typedef K::Vector_3 Vector;
typedef CGAL::Surface_mesh<Point> Surface_mesh;
typedef boost::graph_traits<Surface_mesh>::vertex_descriptor vertex_descriptor;
typedef boost::graph_traits<Surface_mesh>::face_descriptor face_descriptor;
int main(int argc, char* argv[])
{
const char* filename = (argc > 1) ? argv[1] : "data/eight.off";
std::ifstream input(filename);
Surface_mesh mesh;
if (!input || !(input >> mesh) || mesh.is_empty()) {
std::cerr << "Not a valid off file." << std::endl;
return 1;
}
Surface_mesh::Property_map<face_descriptor, Vector> fnormals =
mesh.add_property_map<face_descriptor, Vector>
("f:normals", CGAL::NULL_VECTOR).first;
Surface_mesh::Property_map<vertex_descriptor, Vector> vnormals =
mesh.add_property_map<vertex_descriptor, Vector>
("v:normals", CGAL::NULL_VECTOR).first;
CGAL::Polygon_mesh_processing::compute_normals(mesh,
vnormals,
fnormals,
CGAL::Polygon_mesh_processing::parameters::vertex_point_map(mesh.points()).
geom_traits(K()));
std::cout << "Face normals :" << std::endl;
BOOST_FOREACH(face_descriptor fd, faces(mesh)){
std::cout << fnormals[fd] << std::endl;
}
std::cout << "Vertex normals :" << std::endl;
BOOST_FOREACH(vertex_descriptor vd, vertices(mesh)){
std::cout << vnormals[vd] << std::endl;
}
return 0;
}