1 .. _group_of_underlying_elements_page:
3 ************************************
4 Group Based on Nodes of Other Groups
5 ************************************
8 To create a standalone group of entities basing on nodes of existing reference groups, in the **Mesh** menu select **Group of underlying entities**.
10 The following dialog box will appear:
12 .. image:: ../images/dimgroup_dlg.png
15 In this dialog box specify
17 * the resulting **Group name**,
18 * the **Elements Type** of entities of the resulting group,
19 * the criterion of inclusion of a mesh entity to the result group, which is **Number of common nodes** of the entity and the reference groups:
20 * **All** - include if all nodes are common;
21 * **Main** - include if all corner nodes are common (meaningful for a quadratic mesh)
22 * **At least one** - include if one or more nodes are common
23 * **Majority** - include if half or more nodes are common
25 * select reference groups,
26 * If **Include underlying entities only** option is activated an entity can be included if it is based on nodes of one element of a reference group.
29 In the figure below, there are two reference Volume groups:
31 .. image:: ../images/dimgroup_src.png
37 In this case the following results for Faces, Edges and Nodes are obtained:
39 .. image:: ../images/dimgroup_2d.png
45 .. image:: ../images/dimgroup_1d.png
51 .. image:: ../images/dimgroup_0d.png
57 **See Also** a sample TUI Script of a :ref:`tui_create_dim_group` operation.