/*!

\page aspect_ratio_page Aspect Ratio

\n The <b>Aspect Ratio</b> quality criterion for mesh elements reveals
the degree of conformity of a mesh element to the regular element of
its type (with all edges having the same length).

  

- The <b>Aspect Ratio</b> of a \b triangle 2D element consisting of 3
nodes is calculated using The Verdict Geometric Quality Library
available within VTK. The calculation formula is:

\image html formula4.png

- The <b>Aspect Ratio</b> of a \b quadrangle 2D element consisting of 4
nodes is calculated using The Verdict Geometric Quality Library
available within VTK. The calculation formula is:

\image html formula5.png

<em>To apply the Aspect Ratio quality criterion to your mesh:</em>
<ol>
<li>Display your mesh in the viewer.</li>

<li>Choose <b>Controls > Face Controls > Aspect Ratio</b> or click
<em>"Aspect Ratio"</em> button in the toolbar.

<center>
\image html image37.png
<em>"Aspect Ratio" button</em>
</center>

Your mesh will be displayed in the viewer with its elements colored
according to the applied mesh quality control criterion:

\image html image94.jpg
</li>
</ol>

<br><b>See Also</b> a sample TUI Script of an 
\ref tui_aspect_ratio "Aspect Ratio quality control" operation.

*/