\n Each <b>Entity type</b> has its specific list of criteria, however all
filters have common syntax. For each criterion you should specify the
<b>Threshold Value</b> and whether we search for the elements that should be
-\b More, \b Less or \b Equal to this \b Value. You should also specify if the
-criterion is \b Unary or \b Binary.
+\b More, \b Less or \b Equal to this \b Value. You can also reverse the
+sense of a criterion using \b Unary operator Not and you should
+specify logical relations between criteria using \b Binary operators
+Or and And.
\n Some criteria should have the additional parameter of \b Tolerance.
When we create a <b>Standalone Group</b> using filters (for this click
existing filter from <b>Selection filter library</b> and <b>Add
to...</b> button gives you a possibility to save your current filter
in the Library.
+\n <b>Note:</b> If the button <b>Apply and Close</b> is disabled, there
+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.
-\image html a-filteronedges.png
+\image html a-filteronfaces.png
-*/
\ No newline at end of file
+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 shape defined by <b>Threshold Value</b>.
+If the threshold shape is a sub-shape of the main shape of the mesh
+the algorithm works faster, if this is any other
+shape the algorithm works slower.
+</li><li>
+<b>Lying on Geom</b> selects entities whose at least one node
+lies on the shape defined by the <b>Threshold Value</b>.
+If the hreshold shape is a sub-shape of the main shape of the mesh the
+algorithm works faster, if this is any other
+shape, the algorithm works slower.
+</li><li>
+<b>Range of IDs</b> allows selection of entities with the specified
+IDs.
+<b>Threshold Value</b> can be, for example: "1,2,3,50-60,63,67,70-78"
+</li><li>
+<b>Color of Group</b> allows selection of entities belonging to the Group with
+the color defined by the <b>Threshold Value</b>.
+</li>
+</ul>
+
+Some criteria are applicable to all <b>Entity types</b>, except for
+<b>Nodes</b>
+<ul><li>
+<b>Linear</b> allows selection of Linear or Quadratic elements (if Unary is set to "Not")
+</li><li>
+<b>Geometry type</b> allows selection of elements by their geometric type
+defined by the <b>Threshold Value</b>. The list of available geometric
+types depends on the element entity type defined by the <b>Threshold Value</b>.
+</li>
+</ul>
+
+The following criteria are applicable to all <b>Entity types</b>
+except for <b>Volumes</b>:
+<ul><li>
+<b>Belong to Plane</b> selects entities whose all nodes belong to a
+specified plane within a given <b>Tolerance</b>.
+</li><li>
+<b>Belong to Cylinder</b> selects entities whose all nodes belong to a
+specified cylinder within a given <b>Tolerance</b>.
+</li><li>
+<b>Belong to Surface</b> selects entities whose all nodes belong to a
+specified arbitrary surface within a given <b>Tolerance</b>.
+</li>
+</ul>
+
+Additional criteria to select mesh <b>Edges</b> are the following:
+<ul><li>
+<b>Free Borders</b> selects free 1D mesh elements, i.e. edges belonging to
+one face only. See also a
+\ref free_borders_page "Free Borders quality control".
+</li><li>
+<b>Borders at Multi-Connections</b> selects edges belonging to several faces.
+The number of faces should be more, less or equal (within a given <b>Tolerance</b>)
+to the predefined <b>Threshold Value</b>. See also a
+\ref borders_at_multi_connection_page "Borders at Multi-Connection quality control".
+</li><li>
+<b>Length</b> selects edges 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
+\ref length_page "Length quality control".
+</li>
+</ul>
+
+Additional criteria to select mesh <b>Faces</b> are the following:
+<ul><li>
+<b>Aspect ratio</b> selects 2D mesh elements with an aspect ratio (see also an
+\ref aspect_ratio_page "Aspect Ratio quality control"), which is more, less or equal
+(within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Warping</b> selects quadrangles with warping angle (see also a
+\ref warping_page "Warping quality control"), which is more, less or equal
+(within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Minimum angle</b> selects triangles and quadrangles with minimum angle (see also a
+\ref minimum_angle_page "Minimum angle quality control"), which is more, less or equal
+(within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Taper</b> selects quadrangles cells with taper value (see also a
+\ref taper_page "Taper quality control"), which is more, less or equal (within a given
+<b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Skew</b> selects triangles and quadrangles with skew value (see also a
+\ref skew_page "Skew quality control"), which is more, less or equal (within a given
+<b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Area</b> selects triangles and quadrangles with a value of area (see also an
+\ref area_page "Area quality control"), which is more, less or equal (within a given
+<b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Free edges</b> selects 2D mesh elements consisting of edges belonging to
+one element of mesh only. See also a
+\ref free_edges_page "Free Edges quality control".
+</li><li>
+<b>Free faces</b> selects 3D mesh elements wich belong to less than two volumes.
+</li><li>
+<b>Borders at Multi-Connections 2D</b> selects cells consisting of edges belonging to
+several elements of mesh. The number of mesh elements should be more, less or equal
+(within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+See also a
+\ref borders_at_multi_connection_2d_page "Borders at Multi-Connection 2D quality control".
+</li><li>
+<b>Length 2D</b> selects triangles and quadrangles combining of the edges 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
+\ref length_2d_page "Length 2D quality control".
+</li>
+</ul>
+
+Additional criteria to select mesh <b>Volumes</b> are the following:
+<ul><li>
+<b>Aspect ratio 3D</b> selects 3D mesh elements with an aspect ratio (see also an
+\ref aspect_ratio_3d_page "Aspect Ratio 3D quality control"), which is more, less or equal
+(within a given <b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Volume</b> selects 3D mesh elements with a value of volume (see also a
+\ref volume_page "Volume quality control"), which is more, less or equal (within a given
+<b>Tolerance</b>) to the predefined <b>Threshold Value</b>.
+</li><li>
+<b>Bad oriented volume</b> selects mesh volumes, which are incorrectly oriented from
+the point of view of MED convention.
+</li>
+</ul>
+
+
+*/
