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.. _max_element_length_3d_page:
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Element Diameter 3D
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This quality control criterion consists in calculation of the maximal length of edges and diagonals of 3D mesh elements (tetrahedrons, pyramids, etc). For polyhedra the value is always zero.
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*To apply the Element Diameter 3D quality criterion to your mesh:*
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.. |img| image :: ../images/image43.png
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#. Display your mesh in the viewer.
#. Choose **Controls > Volume Controls > Element Diameter 3D** or click *"Element Diameter 3D"* button |img| in the toolbar.
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Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion:
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.. image:: ../images/max_element_length_3d.png
:align: center
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**See Also** a sample TUI Script of a :ref: `tui_max_element_length_3d` filter.
