+ void add(Object3D &);
+ Object3D &get(Object &) const;
+ const ObjectMap &get_all() const { return objects; }
+ void remove(Object3D &);
+
+ template<typename T>
+ T &get(Object &o) const
+ { return dynamic_cast<T &>(get(o)); }
+
+ void add(Utility3D &);
+ void remove(Utility3D &);
+
+ Msp::GL::Scene &get_scene() { return scene; }
+ Msp::GL::Scene &get_endpoint_scene() { return ep_scene; }
+ Msp::GL::Scene &get_path_scene() { return path_scene; }
+ const Msp::GL::Lighting &get_lighting() const { return lighting; }
+
+private:
+ void object_added(Object &);
+ void object_removed(Object &);