/*! \page free_faces_page Free faces This mesh quality control highlights the faces connected to less than two mesh volume elements. The free faces are shown with a color different from the color of shared faces. \image html free_faces.png In this picture some volume mesh elements have been removed, as a result some faces became connected only to one volume. i.e. became free. \sa A sample TUI Script of a \ref tui_free_faces "Free Faces quality control" operation. */