\page selection_filter_library_page Selection filter library
+\tableofcontents
+
+\section selection_filter_library Filter library
+
\n Selection filter library allows creating and storing in files
the filters that can be later reused for operations on meshes. You can
access it from the Main Menu via <b>Tools / Selection filter library</b>.
\n In <b>Filter name</b> box you can specify the name for your
filter. By default it is prefixed with the corresponding entity type.
-\anchor filtering_elements
-<h2>Filter Dialog</h2>
+\section filtering_elements Filter Dialog
When we use filters during group creation or another operation (by
clicking <b>Set Filter</b> button in the corresponding dialog), the
is no selected mesh in the Object Browser and the filter can not be
created. You have to select the mesh and the button will be enabled.
+\section filtering_criteria Filtering Criteria
+
Some criteria are applicable to all <b>Entity types</b>:
<ul><li>
<b>Belong to Geom</b> selects entities whose all nodes lie on the
<b>Double nodes</b> selects a node coincident with other nodes
(within a given <b>Tolerance</b>).
See also \ref tui_double_nodes_control "Double Nodes quality control".
+</li><li>
+<b>Connectivity number</b> selects nodes with a number of connected
+elements, which is more, less or equal to the predefined <b>Threshold
+ Value</b>. Elements of the highest dimension are countered only.
</li>
</ul>
angular tolerance (defined in degrees). Selection continues among all neighbor faces of already
selected ones.<br>
</li><li>
+<b>Deflection 2D</b> selects 2D mesh elements having distance between their gravity
+centers and underlying surfaces, which is more, less or equal (within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>. See also a
+\ref deflection_2d_page "Deflection 2D quality control".
+</li><li>
<b>Element Diameter 2D</b> selects triangles and quadrangles composed of the edges and
diagonals with a value of length, which is more, less or equal
(within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>. See also a
