/*! \page taper_page Taper \n \b Taper mesh quality criterion represents the ratio of the areas of two triangles separated by a diagonal. So it can be calculated only for elements consisting of 4 nodes. \image html image25.png <br><em>To apply the Taper quality criterion to your mesh:</em> <ol> <li>Display your mesh in the viewer.</li> <li>Choose <b>Controls > Face Controls > Taper</b> or click <em>"Taper"</em> button in the toolbar. \image html image36.png <center><em>"Taper" button</em></center> Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion: \image html image90.jpg </li> </ol> <br><b>See Also</b> a sample TUI Script of a \ref tui_taper "Taper quality control" operation. */