/*!

+     * Returns nodes of given face (counted from zero) for given volumic element.
+     */
+    long_array GetElemFaceNodes(in long elemId, in short faceIndex);
+
+    /*!
+     * Returns an element based on all given nodes.
+     */
+    long FindElementByNodes(in long_array nodes);

idl/SMESH_Mesh.idl

@@ -774,6 +774,16 @@ module SMESH
      */
     long ElemNbFaces(in long id);
 
+    /*!
+     * Returns nodes of given face (counted from zero) for given volumic element.
+     */
+    long_array GetElemFaceNodes(in long elemId, in short faceIndex);
+
+    /*!
+     * Returns an element based on all given nodes.
+     */
+    long FindElementByNodes(in long_array nodes);
+
     /*!
      * Returns true if given element is polygon
      */

src/SMDS/SMDS_Mesh.cxx

@@ -941,11 +941,11 @@ SMDS_MeshVolume* SMDS_Mesh::AddVolumeWithID(const SMDS_MeshFace * f1,
 /// Add a polygon defined by its nodes IDs
 ///////////////////////////////////////////////////////////////////////////////
 
-SMDS_MeshFace* SMDS_Mesh::AddPolygonalFaceWithID (std::vector<int> nodes_ids,
+SMDS_MeshFace* SMDS_Mesh::AddPolygonalFaceWithID (vector<int> nodes_ids,
                                                   const int        ID)
 {
   int nbNodes = nodes_ids.size();
-  std::vector<const SMDS_MeshNode*> nodes (nbNodes);
+  vector<const SMDS_MeshNode*> nodes (nbNodes);
   for (int i = 0; i < nbNodes; i++) {
     nodes[i] = (SMDS_MeshNode *)myNodeIDFactory->MeshElement(nodes_ids[i]);
     if (!nodes[i]) return NULL;
@@ -958,7 +958,7 @@ SMDS_MeshFace* SMDS_Mesh::AddPolygonalFaceWithID (std::vector<int> nodes_ids,
 ///////////////////////////////////////////////////////////////////////////////
 
 SMDS_MeshFace* SMDS_Mesh::AddPolygonalFaceWithID
-                          (std::vector<const SMDS_MeshNode*> nodes,
+                          (vector<const SMDS_MeshNode*> nodes,
                            const int                         ID)
 {
   SMDS_MeshFace * face;
@@ -990,7 +990,7 @@ SMDS_MeshFace* SMDS_Mesh::AddPolygonalFaceWithID
 /// An ID is automatically affected to the created face.
 ///////////////////////////////////////////////////////////////////////////////
 
-SMDS_MeshFace* SMDS_Mesh::AddPolygonalFace (std::vector<const SMDS_MeshNode*> nodes)
+SMDS_MeshFace* SMDS_Mesh::AddPolygonalFace (vector<const SMDS_MeshNode*> nodes)
 {
   return SMDS_Mesh::AddPolygonalFaceWithID(nodes, myElementIDFactory->GetFreeID());
 }
@@ -1003,12 +1003,12 @@ SMDS_MeshFace* SMDS_Mesh::AddPolygonalFace (std::vector<const SMDS_MeshNode*> no
 ///////////////////////////////////////////////////////////////////////////////
 
 SMDS_MeshVolume * SMDS_Mesh::AddPolyhedralVolumeWithID
-                             (std::vector<int> nodes_ids,
+                             (vector<int> nodes_ids,
-                              std::vector<int> quantities,
+                              vector<int> quantities,
                               const int        ID)
 {
   int nbNodes = nodes_ids.size();
-  std::vector<const SMDS_MeshNode*> nodes (nbNodes);
+  vector<const SMDS_MeshNode*> nodes (nbNodes);
   for (int i = 0; i < nbNodes; i++) {
     nodes[i] = (SMDS_MeshNode *)myNodeIDFactory->MeshElement(nodes_ids[i]);
     if (!nodes[i]) return NULL;
@@ -1023,8 +1023,8 @@ SMDS_MeshVolume * SMDS_Mesh::AddPolyhedralVolumeWithID
 ///////////////////////////////////////////////////////////////////////////////
 
 SMDS_MeshVolume* SMDS_Mesh::AddPolyhedralVolumeWithID
-                            (std::vector<const SMDS_MeshNode*> nodes,
+                            (vector<const SMDS_MeshNode*> nodes,
-                             std::vector<int>                  quantities,
+                             vector<int>                  quantities,
                              const int                         ID)
 {
   SMDS_MeshVolume* volume;
@@ -1056,8 +1056,8 @@ SMDS_MeshVolume* SMDS_Mesh::AddPolyhedralVolumeWithID
 ///////////////////////////////////////////////////////////////////////////////
 
 SMDS_MeshVolume* SMDS_Mesh::AddPolyhedralVolume
-                            (std::vector<const SMDS_MeshNode*> nodes,
+                            (vector<const SMDS_MeshNode*> nodes,
-                             std::vector<int>                  quantities)
+                             vector<int>                  quantities)
 {
   int ID = myElementIDFactory->GetFreeID();
   SMDS_MeshVolume * v = SMDS_Mesh::AddPolyhedralVolumeWithID(nodes, quantities, ID);
@@ -1763,10 +1763,10 @@ const SMDS_MeshElement* SMDS_Mesh::FindElement(int IDelem) const
 //purpose  : find polygon
 //=======================================================================
 
-const SMDS_MeshFace* SMDS_Mesh::FindFace (const std::vector<int>& nodes_ids) const
+const SMDS_MeshFace* SMDS_Mesh::FindFace (const vector<int>& nodes_ids) const
 {
   int nbnodes = nodes_ids.size();
-  std::vector<const SMDS_MeshNode *> poly_nodes (nbnodes);
+  vector<const SMDS_MeshNode *> poly_nodes (nbnodes);
   for (int inode = 0; inode < nbnodes; inode++) {
     const SMDS_MeshNode * node = FindNode(nodes_ids[inode]);
     if (node == NULL) return NULL;
@@ -1775,18 +1775,43 @@ const SMDS_MeshFace* SMDS_Mesh::FindFace (const std::vector<int>& nodes_ids) con
   return FindFace(poly_nodes);
 }
 
-const SMDS_MeshFace* SMDS_Mesh::FindFace (const std::vector<const SMDS_MeshNode *>& nodes)
+const SMDS_MeshFace* SMDS_Mesh::FindFace (const vector<const SMDS_MeshNode *>& nodes)
 {
-  if ( nodes.size() > 2 && nodes[0] ) {
+  return (const SMDS_MeshFace*) FindElement( nodes, SMDSAbs_Face );
-    SMDS_ElemIteratorPtr itF = nodes[0]->GetInverseElementIterator(SMDSAbs_Face);
+}
-    while (itF->more()) {
+
-      const SMDS_MeshElement* f = itF->next();
+
-      if ( f->NbNodes() == nodes.size() ) {
+//================================================================================
-        for ( int i = 1; f && i < nodes.size(); ++ i )
+/*!
-          if ( f->GetNodeIndex( nodes[ i ]) < 0 )
+ * \brief Return element based on all given nodes
-            f = 0;
+ *  \param nodes - node of element
-        if ( f )
+ *  \param type - type of element
-          return static_cast<const SMDS_MeshFace *> (f);
+ *  \param noMedium - true if medium nodes of quadratic element are not included in <nodes>
+ *  \retval const SMDS_MeshElement* - found element or NULL
+ */
+//================================================================================
+
+const SMDS_MeshElement* SMDS_Mesh::FindElement (const vector<const SMDS_MeshNode *>& nodes,
+                                                const SMDSAbs_ElementType            type,
+                                                const bool                           noMedium)
+{
+  if ( nodes.size() > 0 && nodes[0] )
+  {
+    SMDS_ElemIteratorPtr itF = nodes[0]->GetInverseElementIterator(type);
+    while (itF->more())
+    {
+      const SMDS_MeshElement* e = itF->next();
+      int nbNodesToCheck = noMedium ? e->NbCornerNodes() : e->NbNodes();
+      if ( nbNodesToCheck == nodes.size() )
+      {
+        for ( int i = 1; e && i < nodes.size(); ++ i )
+        {
+          int nodeIndex = e->GetNodeIndex( nodes[ i ]);
+          if ( nodeIndex < 0 || nodeIndex >= nbNodesToCheck )
+            e = 0;
+        }
+        if ( e )
+          return static_cast<const SMDS_MeshFace *> (e);
       }
     }
   }

src/SMDS/SMDS_Mesh.hxx

@@ -492,6 +492,9 @@ public:
 
   const SMDS_MeshFace *FindFace(const std::vector<int>& nodes_ids) const;
   static const SMDS_MeshFace* FindFace(const std::vector<const SMDS_MeshNode *>& nodes);
+  static const SMDS_MeshElement* FindElement(const std::vector<const SMDS_MeshNode *>& nodes,
+                                             const SMDSAbs_ElementType                 type=SMDSAbs_All,
+                                             const bool                                noMedium=true);
 
   /*!
    * \brief Raise an exception if free memory (ram+swap) too low

src/SMESH_I/SMESH_Mesh_i.cxx

@@ -3195,6 +3195,57 @@ CORBA::Long SMESH_Mesh_i::ElemNbFaces(const CORBA::Long id)
   return elem->NbFaces();
 }
 
+//=======================================================================
+//function : GetElemFaceNodes
+//purpose  : Returns nodes of given face (counted from zero) for given element.
+//=======================================================================
+
+SMESH::long_array* SMESH_Mesh_i::GetElemFaceNodes(CORBA::Long  elemId,
+                                                  CORBA::Short faceIndex)
+{
+  SMESH::long_array_var aResult = new SMESH::long_array();
+  if ( SMESHDS_Mesh* aSMESHDS_Mesh = _impl->GetMeshDS() )
+  {
+    if ( const SMDS_MeshElement* elem = aSMESHDS_Mesh->FindElement(elemId) )
+    {
+      SMDS_VolumeTool vtool( elem );
+      if ( faceIndex < vtool.NbFaces() )
+      {
+        aResult->length( vtool.NbFaceNodes( faceIndex ));
+        const SMDS_MeshNode** nn = vtool.GetFaceNodes( faceIndex );
+        for ( int i = 0; i < aResult->length(); ++i )
+          aResult[ i ] = nn[ i ]->GetID();
+      }
+    }
+  }
+  return aResult._retn();
+}
+
+//=======================================================================
+//function : FindElementByNodes
+//purpose  : Returns an element based on all given nodes.
+//=======================================================================
+
+CORBA::Long SMESH_Mesh_i::FindElementByNodes(const SMESH::long_array& nodes)
+{
+  CORBA::Long elemID(0);
+  if ( SMESHDS_Mesh* mesh = _impl->GetMeshDS() )
+  {
+    vector< const SMDS_MeshNode * > nn( nodes.length() );
+    for ( int i = 0; i < nodes.length(); ++i )
+      if ( !( nn[i] = mesh->FindNode( nodes[i] )))
+        return elemID;
+
+    const SMDS_MeshElement* elem = mesh->FindElement( nn );
+    if ( !elem && ( _impl->NbEdges( ORDER_QUADRATIC ) ||
+                    _impl->NbFaces( ORDER_QUADRATIC ) ||
+                    _impl->NbVolumes( ORDER_QUADRATIC )))
+      elem = mesh->FindElement( nn, SMDSAbs_All, /*noMedium=*/true );
+
+    if ( elem ) elemID = CORBA::Long( elem->GetID() );
+  }
+  return elemID;
+}
 
 //=============================================================================
 /*!

src/SMESH_I/SMESH_Mesh_i.hxx

@@ -455,7 +455,16 @@ public:
    * Returns number of faces for given element
    */
   CORBA::Long ElemNbFaces(CORBA::Long id);
-  
+  /*!
+   * Returns nodes of given face (counted from zero) for given element.
+   */
+  SMESH::long_array* GetElemFaceNodes(CORBA::Long elemId, CORBA::Short faceIndex);
+
+  /*!
+   * Returns an element based on all given nodes.
+   */
+  CORBA::Long FindElementByNodes(const SMESH::long_array& nodes);
+
   /*!
    * Returns true if given element is polygon
    */