/*! \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. To apply the Length 2D quality criterion to your mesh:
  1. Display your mesh in the viewer.
  2. Choose Controls > Face Controls > Length 2D or click "Length 2D" button in the toolbar. \image html image34.png
    "Length 2D" button
    Your mesh will be displayed in the viewer with links colored according to the applied mesh quality control criterion: \image html length2d.png

See Also a sample TUI Script of a \ref tui_length_2d "Length 2D quality control" operation. */