Merge pull request #4203 from maxGimeno/Demo-Fix_detect_boundaries-GF

Polyhedron Demo: Fix  stitching plugin

Polyhedron/demo/Polyhedron/Plugins/IO/OFF_io_plugin.cpp

@@ -2,6 +2,7 @@
 #include "Scene_polygon_soup_item.h"
 #include "Scene_points_with_normal_item.h"
 #include <CGAL/Three/Three.h>
+#include <CGAL/Polygon_mesh_processing/repair.h>
 
 
 #include <CGAL/Polygon_mesh_processing/polygon_soup_to_polygon_mesh.h>
@@ -181,6 +182,19 @@ Polyhedron_demo_off_plugin::load_off(QFileInfo fileinfo) {
                          tr("%1 isolated vertices found")
                          .arg(item->getNbIsolatedvertices()));
   }
+  typedef boost::function_output_iterator<CGAL::internal::Throw_at_output> OutputIterator;
+  try{
+    CGAL::Polygon_mesh_processing::non_manifold_vertices(*surface_mesh, OutputIterator());
+  }
+  catch( CGAL::internal::Throw_at_output::Throw_at_output_exception& )
+  {
+
+    QApplication::restoreOverrideCursor();
+    QMessageBox::warning((QWidget*)NULL,
+                         tr("Non Manifold Vertices"),
+                         tr("Non-manifold vertices have been found"));
+  }
+
   if(item->isItemMulticolor())
     item->computeItemColorVectorAutomatically(true);
   return item;

Polyhedron/demo/Polyhedron/Plugins/PMP/Polyhedron_stitching_plugin.cpp

@@ -14,25 +14,6 @@
 #include <CGAL/boost/graph/helpers.h>
 #include <boost/graph/filtered_graph.hpp>
 
-template <typename G>
-struct Is_border {
-  const G& g;
-  Is_border(const G& g)
-    : g(g)
-  {}
-
- template <typename Descriptor>
-  bool operator()(const Descriptor& d) const {
-   return is_border(d,g);
-  }
-
-  bool operator()(typename boost::graph_traits<G>::vertex_descriptor d) const {
-    return is_border(d,g) != boost::none;
-  }
-
-};
-
-
 using namespace CGAL::Three;
 class Polyhedron_demo_polyhedron_stitching_plugin :
   public QObject,
@@ -90,30 +71,6 @@ public Q_SLOTS:
 }; // end Polyhedron_demo_polyhedron_stitching_plugin
 
 
-template <typename Poly>
-struct Polyline_visitor
-{
-  Scene_polylines_item* new_item;
-  typename boost::property_map<Poly, CGAL::vertex_point_t>::const_type vpm;
-
-  Polyline_visitor(const Poly& poly, Scene_polylines_item* new_item)
-    : new_item(new_item), vpm(get(CGAL::vertex_point,poly))
-  {}
-
-  void start_new_polyline()
-  {
-    new_item->polylines.push_back( Scene_polylines_item::Polyline() );
-  }
-
-  void add_node(typename boost::graph_traits<Poly>::vertex_descriptor vd)
-  {
-    
-    new_item->polylines.back().push_back(get(vpm,vd));
-  }
-
-  void end_polyline(){}
-};
-
 
 template <typename Item>
 void Polyhedron_demo_polyhedron_stitching_plugin::on_actionDetectBorders_triggered(Scene_interface::Item_id index)
@@ -127,17 +84,15 @@ void Polyhedron_demo_polyhedron_stitching_plugin::on_actionDetectBorders_trigger
 
       FaceGraph* pMesh = item->polyhedron();
       normalize_border(*pMesh);
-
-
-      typedef boost::filtered_graph<FaceGraph,Is_border<FaceGraph>, Is_border<FaceGraph> > BorderGraph;
-      
-      Is_border<FaceGraph> ib(*pMesh);
-      BorderGraph bg(*pMesh,ib,ib);
-      Polyline_visitor<FaceGraph> polyline_visitor(*pMesh, new_item); 
-      CGAL::split_graph_into_polylines( bg,
-                                        polyline_visitor,
-                                        CGAL::internal::IsTerminalDefault() );
-
+      for(auto ed : edges(*pMesh))
+      {
+        if(pMesh->is_border(ed))
+        {
+          new_item->polylines.push_back(Scene_polylines_item::Polyline());
+          new_item->polylines.back().push_back(pMesh->point(pMesh->source(pMesh->halfedge(ed))));
+          new_item->polylines.back().push_back(pMesh->point(pMesh->target(pMesh->halfedge(ed))));
+        }
+      }
 
       if (new_item->polylines.empty())
         {

Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp

@@ -260,6 +260,7 @@ struct Scene_surface_mesh_item_priv{
   double volume, area;
   unsigned int number_of_null_length_edges;
   unsigned int number_of_degenerated_faces;
+  bool has_nm_vertices;
   int genus;
   bool self_intersect;
   mutable QSlider* alphaSlider;
@@ -1515,6 +1516,7 @@ invalidate_stats()
 {
   number_of_degenerated_faces = (unsigned int)(-1);
   number_of_null_length_edges = (unsigned int)(-1);
+  has_nm_vertices = false;
   volume = -std::numeric_limits<double>::infinity();
   area = -std::numeric_limits<double>::infinity();
   self_intersect = false;
@@ -1568,11 +1570,30 @@ QString Scene_surface_mesh_item::computeStats(int type)
     }
     faces_aspect_ratio(d->smesh_, min_altitude, min_ar, max_ar, mean_ar);
   }
+  if(type == HAS_NM_VERTICES)
+  {
 
+    d->has_nm_vertices = false;
+    typedef boost::function_output_iterator<CGAL::internal::Throw_at_output> OutputIterator;
+    try{
+      CGAL::Polygon_mesh_processing::non_manifold_vertices(*d->smesh_, OutputIterator());
+    }
+    catch( CGAL::internal::Throw_at_output::Throw_at_output_exception& )
+    {
+      d->has_nm_vertices = true;
+    }
+
+  }
   switch(type)
   {
   case NB_VERTICES:
     return QString::number(num_vertices(*d->smesh_));
+  case HAS_NM_VERTICES:
+  {
+    if(d->has_nm_vertices)
+      return QString("Yes");
+    return QString("No");
+  }
 
   case NB_FACETS:
     return QString::number(num_faces(*d->smesh_));
@@ -1721,14 +1742,15 @@ CGAL::Three::Scene_item::Header_data Scene_surface_mesh_item::header() const
   CGAL::Three::Scene_item::Header_data data;
   //categories
 
-  data.categories.append(std::pair<QString,int>(QString("Properties"),9));
+  data.categories.append(std::pair<QString,int>(QString("Properties"),11));
   data.categories.append(std::pair<QString,int>(QString("Faces"),10));
-  data.categories.append(std::pair<QString,int>(QString("Edges"),7));
-  data.categories.append(std::pair<QString,int>(QString("Angles"),2));
+  data.categories.append(std::pair<QString,int>(QString("Edges"),6));
+  data.categories.append(std::pair<QString,int>(QString("Angles"),3));
 
 
   //titles
   data.titles.append(QString("#Vertices"));
+  data.titles.append(QString("Has Non-manifold Vertices"));
   data.titles.append(QString("#Connected Components"));
   data.titles.append(QString("#Border Edges"));
   data.titles.append(QString("Pure Triangle"));

Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.h

@@ -106,6 +106,7 @@ public:
   //statistics
   enum STATS {
     NB_VERTICES = 0,
+    HAS_NM_VERTICES,
     NB_CONNECTED_COMPOS,
     NB_BORDER_EDGES,
     IS_PURE_TRIANGLE,

Surface_mesh/include/CGAL/Surface_mesh/Surface_mesh.h

@@ -1758,6 +1758,8 @@ public:
     /// With `check_all_incident_halfedges == false` the function returns `true`, if the incident
     /// halfedge associated to vertex `v` is a border halfedge, or if the vertex is isolated.
     /// \cgalAdvancedEnd
+    /// \attention If the data contained in the `Surface_mesh` is not a 2-manifold, then
+    /// this operation is not guaranteed to return the right result.
   bool is_border(Vertex_index v, bool check_all_incident_halfedges = true) const
     {
         Halfedge_index h(halfedge(v));