.. _length_2d_page:

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Length 2D
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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:**

#. Display your mesh in the viewer. 
#. Choose **Controls > Face Controls > Length 2D** or click **"Length 2D"** button in the toolbar. 

.. image:: ../images/image34.png
	:align: center

.. centered::
	**"Length 2D" button**

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` operation.