/*!
-\page group_of_underlying_elements_page Create Group of Underlying Elements
+\page group_of_underlying_elements_page Group Based on Nodes of Other Groups
-To create groups of entities from existing groups of superior dimensions, in the \b Mesh menu select <b>Group of underlying entities</b>.<br>
+To create a standalone group of entities basing on nodes of existing
+reference groups, in the \b Mesh menu select <b>Group of underlying entities</b>.
The following dialog box will appear:
\image html dimgroup_dlg.png
-In this dialog box specify the name of the resulting group, types of entities and set of source groups.
-
-In the figure below, there are two source Volume groups:
+In this dialog box specify <ul>
+ <li> the resulting <b>Group name</b>, </li>
+ <li> the <b>Elements Type</b> of entities of the resulting group,</li>
+ <li> the criterion of inclusion of a mesh entity to the result group,
+ which is <b>Number of common nodes</b> of the entity and the
+ reference groups: <ul>
+ <li>\b All - include if all nodes are common;</li>
+ <li>\b Main - include if all corner nodes are common (meaningful for
+ a quadratic mesh) </li>
+ <li><b>At least one</b> - include if one or more nodes are common</li>
+ <li>\b Majority - include if half or more nodes are common</li></ul>
+ </li>
+ <li> select reference groups,</li>
+ <li> If <b>Include underlying entities only</b> option is activated
+ an entity can be included if it is based on nodes of
+ one element of a reference group.</li>
+</ul>
+
+In the figure below, there are two reference Volume groups:
\image html dimgroup_src.png
-<center>Source groups</center>
+<center>Reference groups</center>
-In this case the following results for Faces, Edges and Nodes are obtained:
+In this case the following results for Faces, Edges and Nodes are obtained:
\image html dimgroup_2d.png
<center>Faces</center>
\image html dimgroup_0d.png
<center>Nodes</center>
-<b>See Also</b> a sample TUI Script of a
-\ref tui_create_dim_group "Creating groups of entities from existing groups of superior dimensions"
+<b>See Also</b> a sample TUI Script of a
+\ref tui_create_dim_group "Creating groups basing on nodes of other groups"
operation.
*/
