virtual void connectEntities( const scene::Path& e1, const scene::Path& e2, int index ) = 0;
virtual void setLightRadii( bool lightRadii ) = 0;
-virtual bool getLightRadii() = 0;
+virtual bool getLightRadii() const = 0;
virtual void setShowNames( bool showNames ) = 0;
virtual bool getShowNames() = 0;
virtual void setShowAngles( bool showAngles ) = 0;