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>
+the parent mesh on the parent geometrical object.
+
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
sub-mesh. You can define algorithms and hypotheses in the same way as
in \ref constructing_meshes_page "Create mesh" menu.
+\par
+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 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.
+
+
\par
In the Object Browser the structure of the new sub-mesh will be
displayed as follows:
