7 This quality control criterion consists of calculation of length of the links between corner nodes of mesh faces.
9 **To apply the Length 2D quality criterion to your mesh:**
11 #. Display your mesh in the viewer.
12 #. Choose **Controls > Face Controls > Length 2D** or click **"Length 2D"** button in the toolbar.
14 .. image:: ../images/image34.png
18 **"Length 2D" button**
20 Your mesh will be displayed in the viewer with links colored according to the applied mesh quality control criterion:
22 .. image:: ../images/length2d.png
26 **See Also** a sample TUI Script of a :ref:`tui_length_2d` operation.