.. _length_2d_page: ********* Length 2D ********* 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:* .. |img| image:: ../images/image34.png #. Display your mesh in the viewer. #. Choose **Controls > Face Controls > Length 2D** or click *"Length 2D"* button |img| in the toolbar. Your mesh will be displayed in the viewer with links colored according to the applied mesh quality control criterion: .. image:: ../images/length2d.png :align: center **See Also** a sample TUI Script of a :ref:`tui_length_2d` filter.