From ada534c4acfd08bcb538960d3d91c439ee5f85ed Mon Sep 17 00:00:00 2001
From: Jane Tournois <jane.tournois@geometryfactory.com>
Date: Mon, 16 Mar 2015 14:18:04 +0100
Subject: [PATCH] compute_normals_example

---
 .../compute_normals_example.cpp               |  46 +-
 .../Polygon_mesh_processing/data/eight.off    | 951 ++++++++++++++++++
 2 files changed, 992 insertions(+), 5 deletions(-)
 create mode 100644 Polygon_mesh_processing/examples/Polygon_mesh_processing/data/eight.off

diff --git a/Polygon_mesh_processing/examples/Polygon_mesh_processing/compute_normals_example.cpp b/Polygon_mesh_processing/examples/Polygon_mesh_processing/compute_normals_example.cpp
index 43bca02dc75..226dffdd7c6 100644
--- a/Polygon_mesh_processing/examples/Polygon_mesh_processing/compute_normals_example.cpp
+++ b/Polygon_mesh_processing/examples/Polygon_mesh_processing/compute_normals_example.cpp
@@ -1,13 +1,49 @@
+#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
+#include <CGAL/Surface_mesh.h>
+
 #include <CGAL/Polygon_mesh_processing/compute_normal.h>
 
-//CGAL::Polygon_mesh_processing::compute_face_normal()
-//CGAL::Polygon_mesh_processing::compute_vertex_normal()
-//CGAL::Polygon_mesh_processing::compute_normals()
-//CGAL::Polygon_mesh_processing::compute_face_normals()
-//CGAL::Polygon_mesh_processing::compute_vertex_normals()
+#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()
 {
+  Surface_mesh mesh;
+  std::ifstream input("data/elephant.off");
+  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;
+  Surface_mesh::Property_map<vertex_descriptor, Vector> vnormals;
+  bool created;
+  boost::tie(fnormals, created)
+    = mesh.add_property_map<face_descriptor, Vector>("f:normals", Vector(0, 0, 0));
+  boost::tie(vnormals, created)
+    = mesh.add_property_map<vertex_descriptor, Vector>("v:normals", Vector(0, 0, 0));
+
+  CGAL::Polygon_mesh_processing::compute_normals(mesh,
+                                                 vnormals,
+                                                 fnormals,
+                                                 mesh.points(),//optional
+                                                 K());         //optional
+
+  std::cout << "Face normals :" << std::endl;
+  BOOST_FOREACH(face_descriptor fd, faces(mesh)){
+    std::cout << fnormals[fd] << std::endl;
+  }
+  std::cout << "Normals at vertices :" << std::endl;
+  BOOST_FOREACH(vertex_descriptor vd, vertices(mesh)){
+    std::cout << vnormals[vd] << std::endl;
+  }
   return 0;
 }
diff --git a/Polygon_mesh_processing/examples/Polygon_mesh_processing/data/eight.off b/Polygon_mesh_processing/examples/Polygon_mesh_processing/data/eight.off
new file mode 100644
index 00000000000..45eca33e155
--- /dev/null
+++ b/Polygon_mesh_processing/examples/Polygon_mesh_processing/data/eight.off
@@ -0,0 +1,951 @@
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