\page creating_groups_page Creating groups
-\n In MESH you can create a group of elements of a certain type. The
-contents of the group can be defined in different ways. To create a group, in the \b
-Mesh menu select <b>Create Group</b> item (also available in the
-context menu of the mesh).<br>
-To create a group of any type you should define the following:
+\n In MESH you can create a \ref grouping_elements_page "group" of
+elements of a certain type. The main way to create a group, is to
+select in the \b Mesh menu <b>Create Group</b> item (also available in
+the context menu of the mesh).<br>
+To create a group you should define the following:
<ul>
<li><b>Mesh</b> - the mesh whose elements will form your
group. You can select your mesh in the Objet Browser or in the 3D
elements which will form your group:</li>
<ul>
<li><b>Nodes</b></li>
+<li><b>0D Element</b></li>
+<li><b>Ball</b></li>
<li><b>Edges</b></li>
<li><b>Faces</b></li>
<li><b>Volumes</b></li>
</ul>
<li><b>Name</b> field allows to enter the name of your new group.</li>
-<li><b>Color</b> - allows to assign to the group a certain color, for
-example, defining boundary conditions. The chosen color is used to
-display the elements of the group. The color attribute of the group is
-not persistent, it is lost if you save and then load the study from
-the file.</li>
+<li><b>Color</b> - allows to assign to the group a certain color. The
+ chosen color is used to display the elements of the group.<br>
+ Activation of <em>Auto Color</em> item in mesh context menu
+ switches on a random choice of a color for a new group.</li>
</ul>
-SALOME Platform distinguishes between the three Group types:
+Mesh module distinguishes between the three Group types:
<b>Standalone Group</b>, <b>Group on Geometry</b> and <b>Group on Filter</b>.
\anchor standalone_group <br><h2>"Standalone Group"</h2>
the following ways:
<ul>
<li>By adding all entities of the chosen type existing in the
- mesh. For this, turn on the <b>Select All</b> check box. In this mode
- all controls, which allow selecting the entities in other ways, are
+ mesh. For this, turn on the <b>Select All</b> check-box. In this mode
+ all controls, which allow selecting the entities, are
disabled.</li>
-<li>By applying the Filter. The <b>Set filter</b> button allows to
- define the filter for selection of the elements for your group. See more
- about filters on the
- \ref selection_filter_library_page "Selection filter library" page.<br>
- If the <b>Enable manual edition</b> check box is turned off, the
- filter entirely defines the group contents. In this mode, the filter is
- applied to all elements of the mesh. If there are no entities
- corresponding to the filter, the \b Apply button is disabled.<br>
- If the <b>Enable manual edition</b> check box is turned on, the defined
- filter can be used to for selection of entities for the group.</li>
<li>By choosing entities manually with the mouse in the 3D Viewer. For
this, turn on the <b>Enable manual edition</b> check box. You can
click on an element in the 3D viewer and it will be highlighted. After
that click the \b Add button and the ID of this element will be
- added to the list.</li>
-<li>By adding entities from either a submesh or an existing
- group. For this, turn on the <b>Enable manual edition</b> check
- box. <b>Select from</b> set of fields allows to select a submesh or
- a group of the appropriate type.</li>
+ added to the list.<br>
+ The <b>Set filter</b> button allows to define the filter for
+ selection of the elements for your group. See more about filters on
+ the \ref selection_filter_library_page "Selection filter library"
+ page.</li>
+<li>By adding entities from either a sub-mesh or another
+ group. For this, turn on the <b>Enable manual edition</b> check
+ box. <b>Select from</b> fields group allows to select a sub-mesh or
+ a group of the appropriate type and to \b Add their elements to the
+ group.</li>
</ul>
In the <b>manual edition</b> mode you can
<ul>
-<li>click the \b Remove button to remove the selected elements from the list</li>
+<li>click the \b Remove button to remove the selected items from
+ the list.</li>
<li>click the <b>Sort List</b> button to sort the list of IDs of
-mesh elements.</li>
+ mesh elements.</li>
</ul>
\image html creategroup.png
<ul>
<li> Select the \b Face type of entities and input the name of the new group.</li>
<li> Check the \b Group checkbox in <b>Select From</b> group.</li>
-<li> Select the existing group of faces in the object browser or in the viewer</li>
+<li> Select the existing group of faces in the object browser or in the viewer.</li>
<li> Click \b Add in \b Content group. <b>Id Elements</b> list will be filled
-with IDs of faces belonging to the exising group.</li>
+with IDs of faces belonging to the selected group.</li>
<li> Select other faces in the viewer.</li>
<li> Click \b Add in \b Content group.</li>
<li> Click \b Apply button to create the new group.</li>
<center>In this picture the brown cells belong to a group defined
manually.</center>
-\image html image131.gif
-<center>In this picture the brown cells belong to the group defined by
- the criterion <b>Taper > 0</b>.</center>
-
<b>See Also</b> a sample TUI Script of a
\ref tui_create_standalone_group "Create a Standalone Group"
operation.
To create a group on geometry check <b>Group on geometry</b> in the \b
Group \b type field. The group on geometry contains the elements
of a certain type generated on the selected geometrical object. Group
-contents are dynamically updated if the mesh is modified.<br>
-To define a group, select in the Objet Browser or in the 3D viewer a
-geometrical object from which the elements will be taken. After
-confirmation of the operation a new group of mesh elements will be
-created.
+contents are dynamically updated if the mesh is modified. The group on
+geometry can be created only if the mesh is based on geometry.
+
+To define a group, click the \a Selection button and choose
+- <em>Direct geometry selection</em> to select a shape in the Object
+ Browser or in the Viewer;
+- <em>Find geometry by mesh element selection</em> to activate a
+ dialog which retrieves a shape by the selected element generated on
+ this shape.
+
+Note that this choice is available only if the mesh elements are
+already generated.
\image html a-creategroup.png
+After confirmation of the operation a new group of mesh elements will
+be created.
+
\image html image132.gif
<center>In this picture the cells which belong to a certain
geometrical face are selected in green.</center>
To create a group on filter check <b>Group on filter</b> in the <b>
Group type</b> field. The group on filter contains the elements
of a certain type satisfying the defined filter. Group contents are
-dynamically updated if the mesh is modified.<br> To define a group,
-click the <b>Set filter</b> button and define criteria of the
-filter in the opened dialog. After confirmation of the operation a
-new group of mesh elements will be created. See more about filters on
-the \ref selection_filter_library_page "Selection filter library" page.
+dynamically updated if the mesh is modified.
+
+To define a group, click the <b>Set filter</b> button and define
+criteria of the filter in the opened dialog. After the
+operation is confirmed, a new group of mesh elements will be created. See more about
+filters on the
+\ref selection_filter_library_page "Selection filter library" page.
\image html creategroup_on_filter.png
