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84 lines
3.8 KiB
Plaintext
84 lines
3.8 KiB
Plaintext
/*!
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\page grouping_elements_page Grouping elements
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In Mesh module it is possible to create groups of mesh entities:
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nodes, edges, faces, volumes, 0D elements or balls. One group contains
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elements of only one type. Groups, unlike sub-meshes, are exported
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along with mesh entities into the files of following formats: MED, UNV,
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and CGNS. The group has a color attribute which is used for
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visualization only and is not exported.
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There are three types of groups different by their internal
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organization:<ol>
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<li><b>Standalone group</b> is a static set of mesh entities. Its
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contents can be explicitly controlled by the user. Upon removal of
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the entities included into the group, e.g. due to modification of
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meshing parameter, the group becomes empty and its content can be
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restored only manually. Hence it is reasonable to create standalone
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groups when the mesh generation is finished and mesh quality is
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verified.
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\warning Creation and edition of large standalone groups in
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\ref creating_groups_page "Create group" dialog using manual edition
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is problematic due to poor performance of the dialog.</li>
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<li><b>Group on geometry</b> is associated to a sub-shape or a group of
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sub-shapes of the main shape and includes mesh entities generated on
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these geometrical entities. The association to a geometry is
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established at group construction and cannot be changed. The group
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contents are always updated automatically, hence the
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group can be created even before mesh elements generation.</li>
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<li><b>Group on filter</b> encapsulates a \ref filters_page "filter",
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which is used to select mesh entities composing the group from the
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whole mesh. Criteria of the filter can be changed at any time. The
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group contents are always updated automatically, hence the group can
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be created even before mesh elements generation.</li>
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</ol>
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The group on geometry and group on filter can be converted to
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a standalone group.
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\image html groups_in_OB.png "Groups of different types look differently in the Object Browser"
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The following ways of group creation are possible:
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- \subpage creating_groups_page "Create group" dialog allows creation of
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a group of any type:
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\ref standalone_group "Standalone group",
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\ref group_on_geom "Group on geometry" and
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\ref group_on_filter "Group on filter" using dedicated tabs.
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- \subpage create_groups_from_geometry_page "Create Groups from Geometry"
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dialog allows creation of several groups on geometry at once.
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- Standalone groups of all nodes and elements of the chosen sub-mesh
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(type of elements depends on dimension of sub-mesh geometry) can
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be created using <b>Mesh -> Construct Group</b> menu item (available
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from the context menu as well).
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- Standalone groups of any element type can be created basing on nodes
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of other groups - using \subpage group_of_underlying_elements_page
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"Group based on nodes of other groups" dialog.
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- Standalone groups can be created by applying
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\subpage using_operations_on_groups_page "Boolean operations" to
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other groups.
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- Creation of standalone groups is an option of many
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\ref modifying_meshes_page "mesh modification" operations.
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The created groups can be later:
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- \subpage editing_groups_page "Edited"
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- \subpage deleting_groups_page "Deleted", either as an object or
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together with contained elements.
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- The group on geometry and group on filter can be
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\ref convert_to_standalone "converted into the standalone" group.
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- \ref importing_exporting_meshes_page "Exported" into a file as a
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whole mesh.
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In the Object Browser, if an item contains more than one child group,
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it is possible to sort the groups by name in ascending order
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using <b>Sort children</b> context menu item.
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\image html smesh_sort_groups.png "Sorting groups"
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An important tool, providing filters for creation of standalone
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groups and groups on filter is \ref selection_filter_library_page.
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*/
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