Secure the invalid c3t3_items to keep from calling algorithm that won't work on them.

Polyhedron/demo/Polyhedron/Plugins/Mesh_3/C3t3_io_plugin.cpp

@@ -97,6 +97,7 @@ Polyhedron_demo_c3t3_binary_io_plugin::load(QFileInfo fileinfo) {
       Scene_c3t3_item* item = new Scene_c3t3_item();
       item->setName(fileinfo.baseName());
       item->setScene(scene);
+      item->set_valid(false);
       std::vector<bool> border_infos;
       bool facets_in_complex = false;
       if(CGAL::build_triangulation_from_file<C3t3::Triangulation, true>(in, item->c3t3().triangulation(), border_infos))

Polyhedron/demo/Polyhedron/Plugins/Mesh_3/C3t3_rib_exporter_plugin.cpp

@@ -47,7 +47,9 @@ public:
   {
     return QList<QAction*>() << actionCreateRib;
   }
-  bool applicable(QAction*)const{return qobject_cast<Scene_c3t3_item*>(scene->item(scene->mainSelectionIndex()));}
+  bool applicable(QAction*)const{
+    Scene_c3t3_item* item = qobject_cast<Scene_c3t3_item*>(scene->item(scene->mainSelectionIndex()));
+    return item && item->is_valid();}
   
 public Q_SLOTS:
   void create_rib();

Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Optimization_plugin.cpp

@@ -90,7 +90,7 @@ public:
   bool applicable(QAction* a) const {
     Scene_c3t3_item* item
       = qobject_cast<Scene_c3t3_item*>(scene->item(scene->mainSelectionIndex()));
-    if (NULL == item)
+    if (NULL == item || !item->is_valid())
       return false;
 
     if (a == actionOdt || a == actionLloyd)

Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp

@@ -231,6 +231,7 @@ struct Scene_c3t3_item_priv {
     , histogram_()
     , surface_patch_indices_()
     , subdomain_indices_()
+    , is_valid(true)
   {
     init_default_values();
   }
@@ -241,6 +242,7 @@ struct Scene_c3t3_item_priv {
     , histogram_()
     , surface_patch_indices_()
     , subdomain_indices_()
+    , is_valid(true)
   {
     init_default_values();
   }
@@ -389,6 +391,7 @@ struct Scene_c3t3_item_priv {
   bool show_tetrahedra;
   bool is_aabb_tree_built;
   bool cnc_are_shown;
+  bool is_valid;
 };
 
 struct Set_show_tetrahedra {
@@ -1129,20 +1132,22 @@ QMenu* Scene_c3t3_item::contextMenu()
       SIGNAL(triggered()), this,
       SLOT(export_facets_in_complex()));
 
-    QAction* actionShowSpheres =
-      menu->addAction(tr("Show protecting &spheres"));
-    actionShowSpheres->setCheckable(true);
-    actionShowSpheres->setObjectName("actionShowSpheres");
-    connect(actionShowSpheres, SIGNAL(toggled(bool)),
-            this, SLOT(show_spheres(bool)));
-
-    QAction* actionShowCNC =
-      menu->addAction(tr("Show cells not in complex"));
-    actionShowCNC->setCheckable(true);
-    actionShowCNC->setObjectName("actionShowCNC");
-    connect(actionShowCNC, SIGNAL(toggled(bool)),
-            this, SLOT(show_cnc(bool)));
+    if(is_valid())
+    {
+      QAction* actionShowSpheres =
+          menu->addAction(tr("Show protecting &spheres"));
+      actionShowSpheres->setCheckable(true);
+      actionShowSpheres->setObjectName("actionShowSpheres");
+      connect(actionShowSpheres, SIGNAL(toggled(bool)),
+              this, SLOT(show_spheres(bool)));
 
+      QAction* actionShowCNC =
+          menu->addAction(tr("Show cells not in complex"));
+      actionShowCNC->setCheckable(true);
+      actionShowCNC->setObjectName("actionShowCNC");
+      connect(actionShowCNC, SIGNAL(toggled(bool)),
+              this, SLOT(show_cnc(bool)));
+    }
     QAction* actionShowTets =
       menu->addAction(tr("Show &tetrahedra"));
     actionShowTets->setCheckable(true);
@@ -1624,4 +1629,13 @@ void Scene_c3t3_item::copyProperties(Scene_item *item)
 
   show_grid(c3t3_item->has_grid());
 }
+
+bool Scene_c3t3_item::is_valid() const
+{
+  return d->is_valid;
+}
+void Scene_c3t3_item::set_valid(bool b)
+{
+  d->is_valid = b;
+}
 #include "Scene_c3t3_item.moc"

Polyhedron/demo/Polyhedron/Scene_c3t3_item.h

@@ -59,6 +59,8 @@ public:
 
   void c3t3_changed();
 
+  void set_valid(bool);
+
   const C3t3& c3t3() const;
   C3t3& c3t3();
 
@@ -70,6 +72,7 @@ public:
   bool has_grid() const;
   bool has_cnc() const;
   bool has_tets() const;
+  bool is_valid() const;//true if the c3t3 is correct, false if it was made from a .mesh, for example
   ManipulatedFrame* manipulatedFrame();
 
   void setPosition(float x, float y, float z) ;