.. _over_constrained_faces_page:

**********************
Over-constrained faces
**********************

This mesh quality control highlights faces sharing only one border
with other faces. In other words, the faces having all their nodes on
the free border of the 2D mesh are highlighted.

.. note::
	The highlighted faces are actually over-constrained only if, at the computation time, the boundary conditions on the borders where the nodes are located are all Dirichlet boundary conditions.

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

.. centered::
	In this picture the over-constrained face is displayed in red.

**See Also** a sample TUI Script of a :ref:`tui_over_constrained_faces` filter.