1 .. _convert_to_from_quadratic_mesh_page:
3 ****************************************
4 Convert to/from Quadratic Mesh
5 ****************************************
7 This functionality allows transforming linear meshes (or sub-meshes) to quadratic and vice versa.
10 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.
12 See :ref:`adding_quadratic_elements_page` for more information about quadratic meshes.
14 *To produce a conversion:*
16 .. |img| image:: ../images/image154.png
18 #. Select a mesh or a sub-mesh in the Object Browser or in the Viewer.
19 #. From the Modification menu or from the contextual menu in the Object Browser choose **Convert to/from Quadratic Mesh** item, or click *"Convert to/from quadratic"* button |img| in the toolbar.
21 The following dialog box will appear:
23 .. image:: ../images/convert.png
26 #. In this dialog box specify:
28 * If it is necessary to convert a linear mesh to quadratic or a quadratic mesh to linear. **Convert to bi-quadratic** creates some types of quadratic elements with additional central nodes: TRIA7, QUAD9 and HEXA27 elements instead of TRIA6, QUAD8, and HEXA20 elements respectively.
29 * If it is necessary to place **medium nodes** of the quadratic mesh **on the geometry** (meshed shape). This option is relevant for conversion to quadratic provided that the mesh is based on a geometry (not imported from file).
31 .. image:: ../images/image156.gif
35 Linear mesh (coarse mesh on a torus)
38 .. image:: ../images/image155.gif
45 #. Click the **Apply** or **Apply and Close** button.
48 **See Also** a sample TUI Script of a :ref:`tui_quadratic` operation.