\sa \ref tui_over_constrained_faces
+\section filter_double_elements Double edges, Double faces, Double volumes
+
+filter mesh elements basing on the same set of nodes:
+- element type is either \a smesh.EGDE, \a smesh.FACE or \a smesh.VOLUME
+- functor type is either \a smesh.FT_EqualEdges, \a
+ smesh.FT_EqualFaces or \a smesh.FT_EqualVolumes,
+- threshold value is not required
+
+\code
+from smesh import *
+# make a mesh on a box
+box = geompy.MakeBoxDXDYDZ(100,100,100)
+mesh = Mesh( box, "Box" )
+mesh.Segment().NumberOfSegments(10)
+mesh.Quadrangle()
+mesh.Hexahedron()
+mesh.Compute()
+# copy all elements with translation and Merge nodes
+mesh.TranslateObject( mesh, MakeDirStruct( 10,0,0), Copy=True )
+mesh.MergeNodes( mesh.FindCoincidentNodes(1e-7) )
+# create filters to find equal elements
+equalEdgesFilter = GetFilter(SMESH.EDGE, FT_EqualEdges)
+equalFacesFilter = GetFilter(SMESH.FACE, FT_EqualFaces)
+equalVolumesFilter = GetFilter(SMESH.VOLUME, FT_EqualVolumes)
+# get equal elements
+print "Number of equal edges:", len( mesh.GetIdsFromFilter( equalEdgesFilter ))
+print "Number of equal faces:", len( mesh.GetIdsFromFilter( equalFacesFilter ))
+print "Number of equal volumes:", len( mesh.GetIdsFromFilter( equalVolumesFilter ))
+\endcode
+
+
+\section tui_double_nodes_control Double nodes
+
+filters mesh nodes which are coincident with other nodes (within a given tolerance):
+- element type is \a smesh.NODE
+- functor type is \a smesh.FT_EqualNodes
+- threshold value is not required
+- default tolerance is 1.0e-7
+
+\code
+from smesh import *
+# make a mesh on a box
+box = geompy.MakeBoxDXDYDZ(100,100,100)
+mesh = Mesh( box, "Box" )
+mesh.Segment().NumberOfSegments(10)
+mesh.Quadrangle()
+mesh.Hexahedron()
+mesh.Compute()
+# copy all elements with translation
+mesh.TranslateObject( mesh, MakeDirStruct( 10,0,0), Copy=True )
+# create filters to find nodes equal within tolerance of 1e-5
+filter = GetFilter(SMESH.NODE, FT_EqualNodes, Tolerance=1e-5)
+# get equal nodes
+print "Number of equal nodes:", len( mesh.GetIdsFromFilter( filter ))
+\endcode
+
+
\section filter_borders_multiconnection Borders at multi-connection
Filter border 1D mesh elements (edges) according to the specified number of
print "Number of pyramids:", len(ids_pyr)
\endcode
+\section combining_filters How to combine filters with Criterion structures?
+
+Filters can be combined by making use of "criteria".
+
+Example :
+
+\code
+# create mesh
+from SMESH_mechanic import *
+# get all the quadrangle faces ...
+criterion1 = smesh.GetCriterion(smesh.FACE, smesh.FT_ElemGeomType, smesh.Geom_QUADRANGLE, smesh.FT_LogicalAND)
+# ... AND do NOT get those from sub_face3
+criterion2 = smesh.GetCriterion(smesh.FACE, smesh.FT_BelongToGeom, sub_face3, smesh.FT_LogicalNOT)
+filter = smesh.CreateFilterManager().CreateFilter()
+filter.SetCriteria([criterion1,criterion2])
+ids = mesh.GetIdsFromFilter(filter)
+
+myGroup = mesh.MakeGroupByIds("Quads_on_cylindrical_faces",smesh.FACE,ids)
+\endcode
+
+
*/
