automatically generate a 3D mesh with the most appropriate
settings. In the same way you can apply this functionality for meshing
2D objects, in which case 3D algorithms are not applied.</li>
-<li>Now, when everything is ready, select your mesh in the <b>Object
+
+\anchor preview_mesh_anchor
+
+<li> After the mesh object is created and all hypotheses are assigned and
+before the mesh computation, it is possible to see the mesh preview.
+
+For this, select the mesh in the Object Browser. From the \b Mesh menu
+select \b Preview or click "Preview" button in the
+toolbar or activate "Preview" item from the pop-up menu.
+
+\image html mesh_precompute.png
+<center><em>"Preview" button</em></center>
+
+Select <b>1D mesh</b> or <b>2D mesh</b> preview mode in the Preview dialog.
+
+
+\image html preview_mesh_1D.png "1D mesh preview shows nodes computed on geometry edges"
+
+\image html preview_mesh_2D.png "2D mesh preview shows edge mesh elements, computed on geometry faces"
+
+<b>Compute</b> button computes the whole mesh.
+
+When the Preview dialog is closed, the question about the storage of temporarily
+created mesh elements appers:
+
+\image html preview_tmp_data.png
+
+These elenents can be reused in the next mesh computation.
+</li>
+
+
+<li>It is equally possible to skip the Preview and \b Compute the mesh
+after the hypotheses are assigned. For this, select your mesh in the <b>Object
Browser</b>. From the \b Mesh menu select \b Compute or click "Compute" button of the
toolbar.
\image html failed_computation.png "Example of the invalid input mesh"
-\Note Mesh Computation Information box does not appear if you set
+\note Mesh Computation Information box does not appear if you set
"Mesh computation/Show a computation result notification" preference
to the "Never" value. This option gives the possibility to control mesh
computation reporting. There are the following possibilities: always
mesh created using these algorithms should be exported into a python
script, edited and then imported into the GUi.
-Consider trying a sample script for construction of a mesh from our
-\ref tui_creating_meshes_page "TUI Scripts" section.
+<li>It is possible to calculate the eventual mesh size
+before \b Compute operation. For this, select the mesh in the <b>Object
+Browser</b> and from the \b Mesh menu select \b Evaluate. The result of
+evaluation will be displayed in the following information box:
+
+\image html mesh_evaluation_succeed.png
+
</li>
+
+</ol>
+
+\anchor mesh_order_anchor
+It is allowed to change submesh priority in mesh computation when
+there are concurrent submeshes present. I.e. user can change priority of
+applying algorithms on shared subshapes of Mesh shape.
+<em>To change submesh priority:</em>
+<ol>
+<li>From the Mesh menu choose the "Change submesh priority" on
+selected Mesh item, or invoke from popup menu. The opened dialogue box
+shows a list of submeshes in the order of their priority. Algorithm and its
+hypotheses of a submesh being upper in the list are applied before those of
+a submesh lower in the list.
+
+There is an example of submesh order modifications of Mesh created on a Box
+shape. The main Mesh object:
+<ul>
+<li><i>3D</i> <b>Tetrahedron (Netgen)</b> with Hypothesis<b>Max Element Volume</b></li>
+<li><i>2D</i> <b>Triangle (Mefisto)</b> with Hypothesis<b>Max Element Area</b>
+</li>
+<li><i>1D</i> <b>Wire discretisation</b> with <b>Number of Segments</b>=20</li>
+</ul>
+The first submesh object <b>Submesh_1</b> created on <b>Face_1</b>
+is:
+<ul>
+<li><i>2D</i> Netgen 1D-2D with Hypothesis <b>Netgen Simple parameters</b>
+(Number of Segments = 4)</li>
+</ul>
+The second submesh object <b>Submesh_2</b> created on <b>Face_2</b>
+is:
+<ul>
+<li><i>2D</i> Netgen 1D-2D with Hypothesis <b>Netgen Simple parameters</b>
+(Number of Segments = 8)</li>
+</ul>
+
+And the last third submesh object <b>Submesh_3</b> created on <b>Face_3</b>
+is:
+<ul>
+<li><i>2D</i> Netgen 1D-2D with Hypothesis <b>Netgen Simple parameters</b>
+(Number of Segments = 12)</li>
+</ul>
+The submeshes can become concurrent if their algorithms leads to mesh shared subshape
+with different algorithms (or different algorithms parameters, i.e. hypothesises).
+In fact, we have three submeshes with concurrent algorithms, becase
+they has different hypothesises assigned to them.
+
+The first mesh computation made with:
+\image html mesh_order_123.png
+<center><em>"Mesh order SubMesh_1, SubMesh_2, SubMesh_3"</em></center>
+\image html mesh_order_123_res.png
+<center><em>"Result mesh with order SubMesh_1, SubMesh_2, SubMesh_3 "</em></center>
+
+The next mesh computation with:
+\image html mesh_order_213.png
+<center><em>"Mesh order SubMesh_2, SubMesh_1, SubMesh_3"</em></center>
+\image html mesh_order_213_res.png
+<center><em>"Result mesh with order SubMesh_2, SubMesh_1, SubMesh_3 "</em></center>
+
+And the last mesh computation with:
+\image html mesh_order_321.png
+<center><em>"Mesh order SubMesh_3, SubMesh_2, SubMesh_1"</em></center>
+\image html mesh_order_321_res.png
+<center><em>"Result mesh with order SubMesh_3, SubMesh_2, SubMesh_1 "</em></center>
+
+As we can see each mesh computation has different number of result
+elements and different mesh descretisation on shared edges (edges,
+that shared between <b>Face_1</b>, <b>Face_2</b> and <b>Face_3</b>)
+
+Additionally, submesh priority (order of algorithms to be applied) can
+be modified not only in separate dialog box, but in <b>Preview</b>
+also. This helps to preview different mesh results, modifying submesh
+order.
+\image html mesh_order_preview.png
+<center><em>"Preview with submesh priority list box"</em></center>
+
+If no concurrent submeshes under Mesh object user will see the
+following information dialog box
+\image html mesh_order_no_concurrent.png
+<center><em>"No concurrent submeshes detected"</em></center>
+and no mesh order list box appear in Preview dialog box.
+
</ol>
-*/
\ No newline at end of file
+Consider trying a sample script for construction of a mesh from our
+\ref tui_creating_meshes_page "TUI Scripts" section.
+
+*/
