.. _double_elements_page: ******************************************** Double edge, Double faces and Double volumes ******************************************** These mesh quality controls highlight the mesh elements basing on the same set of nodes. .. image:: ../images/double_faces.png :align: center In this picture some faces are coincident after copying all elements with translation with subsequent Merge of nodes. **See also** a sample TUI Script of a :ref:`filter_double_elements` filters.