/*! \page length_2d_page Length 2D \n This quality control criterion consists of calculation of length of the links between corner nodes of mesh faces. <em>To apply the Length 2D quality criterion to your mesh:</em> <ol> <li>Display your mesh in the viewer. </li> <li>Choose <b>Controls > Face Controls > Length 2D</b> or click <em>"Length 2D"</em> button in the toolbar. \image html image34.png <center><em>"Length 2D" button</em></center> Your mesh will be displayed in the viewer with links colored according to the applied mesh quality control criterion: \image html length2d.png </li> </ol> <br><b>See Also</b> a sample TUI Script of a \ref tui_length_2d "Length 2D quality control" operation. */