\page constructing_submeshes_page Constructing sub-meshes
-Sub-mesh is a mesh on a geometrical sub-object created with algorithms
-and/or hypotheses other than the algorithms and hypotheses assigned to
-the parent mesh on the parent object.
-<br><br>
+Sub-mesh is a mesh on a geometrical sub-object (sub-shape) used to assign
+different meshing algorithms and/or hypotheses than the algorithms and
+hypotheses assigned to the parent mesh on the parent geometrical
+object, that allows getting a local mesh refinement.
+
+A sub-shape to create a sub-mesh on should be retrieved from the shape
+of the parent mesh in one of the following ways: <ul>
+<li> In Geometry module, via <em>New Entity > Explode</em> menu.</li>
+<li> In Geometry module, by creation of a group (<em>New Entity >
+ Group > Create Group</em> menu).</li>
+<li> In Mesh module, by
+ \ref subshape_by_mesh_elem "selecting a mesh element" generated on a
+ sub-shape of interest. This way is accessible if the mesh is
+ already computed.</li>
+</ul>
+
If a geometrical sub-object belongs to several geometrical objects
having different meshes or sub-meshes, it will be meshed with the
hypotheses of a sub-mesh of a lower dimension.<br>
will be used. This means that an edge shared by two faces each having
its own different sub-mesh, will be meshed using algorithms and
hypotheses of any of the two, chosen randomly. This indeterminacy can
- be fixed by defining \ref submesh_order_anchor "Sub-mesh priority".
+ be fixed by defining \ref submesh_order_anchor "Sub-mesh priority". The
+ default sub-meshes priority is such that multi-dimensional algorithms
+ are processed first.
<br>
\n Construction of a sub-mesh consists of:
From the \b Mesh menu select <b>Create Sub-mesh</b> or click <em>"Create
Sum-mesh"</em> button in the toolbar.
-\image html image33.gif
-<center><em>"Create Sub-mesh" button</em></center>
+<center>
+ \image html image33.gif
+ <em>"Create Sub-mesh" button</em>
+</center>
\par
The following dialog box will appear:
+\par
\image html createmesh-inv2.png
\par
It allows to define the \b Name, the parent \b Mesh and the \b
Geometry (e.g. a face if the parent mesh has been built on box) of the
-sub-mesh. You can define algorithms and hypotheses in the same way as
+sub-mesh. You can select meshing algorithms and hypotheses in the same way as
in \ref constructing_meshes_page "Create mesh" menu.
+\par
+\anchor subshape_by_mesh_elem
+If the parent mesh is already computed, then you can define the
+\b Geometry by picking mesh elements computed on a sub-shape of interest
+in the 3D Viewer, i.e. you do not have to extract this sub-shape
+in Geometry module beforehand. To start element selection, press \a
+Selection button to the right of \b Geometry label. If this button is
+already down, then click it to release and then click it again. The
+following pop-up menu allowing to choose a way of geometry definition will
+appear.
+
+\par
+\image html choose_geom_selection_way.png
+
+\par
+<b>Direct geometry selection</b> enables selecting the sub-shape in the Object
+Browser.
+<b>Find geometry by mesh element selection</b> activates the following dialog.
+
+\par
+\image html find_geom_by_mesh_elem.png
+
+\par
+In this dialog, <b> Element Type </b> defines a kind of element to pick in the
+Viewer.
+Instead of picking an element in the Viewer, you can type its
+ID in <b> Element ID</b> field.
+<b> Geometry name </b> field allows defining a name of the sub-shape,
+with which the sub-shape will appear in the Object Browser (if not yet
+there).
+
\par
In the Object Browser the structure of the new sub-mesh will be
displayed as follows:
\par
It contains:
<ul>
-<li>a reference to the geometrical object on the basis of which the sub-mesh has been constructed;</li>
+<li>a sub-mesh name (\a SubMeshFace1)
+<li>a reference to the geometrical object on the basis of which the
+ sub-mesh has been constructed (<em>Cylindrical Face_1</em>);</li>
<li><b>Applied hypotheses</b> folder containing the references to the
-hypotheses applied to the construction of the sub-mesh;</li>
+hypotheses selected at the construction of the sub-mesh;</li>
<li><b>Applied algorithms</b> folder containing the references to the
-algorithms applied to the construction of the sub-mesh.</li>
+algorithms selected at the construction of the sub-mesh.</li>
</ul>
<br><b>See Also</b> a sample TUI Script of a
