There are three types of groups different by their internal
organization:<ol>
<li><b>Standalone group</b> is a static set of mesh entities. Its
- contents can be explicitely controlled by the user. Upon removal of
- the entities included into the group, the group becomes empty and
- the user is to pay efforts to restore its contents. Hence it is
- resonable to create standalone groups when the mesh generation is
- finished and mesh quality is verified.
+ contents can be explicitly controlled by the user. Upon removal of
+ the entities included into the group, e.g. due to modification of
+ meshing parameter, the group becomes empty and its content can be
+ restored only manually. Hence it is reasonable to create standalone
+ groups when the mesh generation is finished and mesh quality is
+ verified.
\warning Creation and edition of large standalone groups in
\ref creating_groups_page "Create group" dialog using manual edition
is problematic due to poor performance of the dialog.</li>
-<li><b>Group on geomerty</b> is associated to one or a group of
+
+<li><b>Group on geometry</b> is associated to a sub-shape or a group of
sub-shapes of the main shape and includes mesh entities generated on
- this geometrical entities. The association to geometry is
- established at group construction and can't be changed. The group
- contents is always up-to-date without user's efforts, hence the
+ these geometrical entities. The association to a geometry is
+ established at group construction and cannot be changed. The group
+ contents are always updated automatically, hence the
group can be created even before mesh elements generation.</li>
-<li><b>Group on filter</b> encapsulates a filter which is used to
- select mesh entities composing the group from the whole
- mesh. Criteria of the filter can be changed at any time. The
- group contents is always up-to-date without user's efforts, hence
- the group can be created even before mesh elements generation.</li>
+<li><b>Group on filter</b> encapsulates a \ref filters_page "filter",
+ which is used to select mesh entities composing the group from the
+ whole mesh. Criteria of the filter can be changed at any time. The
+ group contents are always updated automatically, hence the group can
+ be created even before mesh elements generation.</li>
</ol>
The group on geometry and group on filter can be converted to
-the standalone group.
+a standalone group.
\image html groups_in_OB.png "Groups of different types look differently in the Object Browser"
The following ways of group creation are possible:
- \subpage creating_groups_page "Create group" dialog allows creation of
- a group of any of all the three types:
+ a group of any type:
\ref standalone_group "Standalone group",
\ref group_on_geom "Group on geometry" and
\ref group_on_filter "Group on filter" using dedicated tabs.
- Standalone groups of all nodes and elements of the chosen sub-mesh
(type of elements depends on dimension of sub-mesh geometry) can
be created using <b>Mesh -> Construct Group</b> menu item (available
- in context menu as well).
+ from the context menu as well).
- Standalone groups of any element type can be created basing on nodes
of other groups - using \subpage group_of_underlying_elements_page
"Group based on nodes of other groups" dialog.
- \ref importing_exporting_meshes_page "Exported" into a file as a
whole mesh.
-In the Object Browser, if groups container item includes more
-than one group, it is possible to sort the groups by name in
-ascending order. For this, select the groups container in the Object
-Browser and choose <b>Sort children</b> context menu item.
+In the Object Browser, if an item contains more than one child group,
+it is possible to sort the groups by name in ascending order
+using <b>Sort children</b> context menu item.
\image html smesh_sort_groups.png "Sorting groups"
