\page convert_to_from_quadratic_mesh_page Convert to/from Quadratic Mesh
-\n This functionality allows you to transtorm standard meshes to
-quadratic and vice versa. See \ref adding_quadratic_elements_page "Adding quadratic elements"
-for more information about quadratic meshes.
+\n This functionality allows transforming linear meshes (or
+sub-meshes) to quadratic and vice versa.
+Note that conversion of a sub-mesh most probably will produce a
+non-conformal mesh. Elements on the boundary between quadratic and
+linear sub-meshes become (or remain) quadratic.
+
+See \ref adding_quadratic_elements_page for more information about
+quadratic meshes.
<em>To produce a conversion:</em>
<ol>
-<li>From the Modification menu choose the Convert to/from Quadratic
-Mesh item, or click <em>"Convert to/from quadratic"</em> button in the
+<li>Select a mesh or a sub-mesh in the Object Browser or in the
+Viewer.</li>
+<li>From the Modification menu choose <b> Convert to/from Quadratic
+Mesh item </b>, or click <em>"Convert to/from quadratic"</em> button in the
toolbar.
-\image html image154.gif
-<center><em>"Convert to/from quadratic" button</em></center>
+<center>
+\image html image154.png
+<em>"Convert to/from quadratic" button</em>
+</center>
The following dialog box will appear:
\image html convert.png
</li>
-<li>In this dialog box you should select:
+<li>In this dialog box specify:
<ul>
-<li>if you wish to convert standard mesh to quadratic or quadratic to standard;</li>
-<li>if you wish to place medium nodes of the quadratic mesh on the geometry (meshed object).</li>
+<li>If it is necessary to convert a linear mesh to quadratic or a quadratic
+ mesh to linear. **Convert to bi-quadratic** option means same as
+ **Convert to quadratic** except that QUAD9 elements are created
+ instead of QUAD8, and HEXA27 elements are created instead of
+ HEXA20. Note that the choice is available only if the selected mesh
+ (or sub-mesh) contains both quadratic and linear elements, else the
+ direction of conversion is selected automatically.</li>
+<li>If it is necessary to place medium nodes of the quadratic mesh on the
+geometry (meshed object). This option is relevant for conversion to
+quadratic provided that the mesh is based on a geometry (not imported from file).</li>
</ul>
\image html image156.gif
-<center>Standard mesh (coarse mesh on a torus)</center>
+<center>Linear mesh (coarse mesh on a torus)</center>
\image html image155.gif
<center>Quadratic mesh</center>
<li>Click the \b Apply or \b OK button.</li>
</ol>
-*/
\ No newline at end of file
+<br><b>See Also</b> a sample TUI Script of a \ref tui_quadratic "Convert to/from quadratic" operation.
+
+*/
