Make IsFreeFace() fast, the old implementation of IsFreeFace() is renamed -> IsFreeFaceAdv()

bool IsFreeFace(  int faceIndex, const SMDS_MeshElement** otherVol=0 ) const;
-  // Check that all volumes built on the face nodes lays on one side
+  // Fast check that only one volume is built on nodes of a given face
+  // otherVol returns another volume sharing the given facet
+
+  bool IsFreeFaceAdv(  int faceIndex, const SMDS_MeshElement** otherVol=0 ) const;
+  // Thorough check that all volumes built on the face nodes lays on one side

+  bool IsPoly() const { return myPolyedre; }

src/SMDS/SMDS_VolumeTool.cxx

@@ -1493,9 +1493,7 @@ double SMDS_VolumeTool::MaxLinearSize2() const
 
 //================================================================================
 /*!
- * \brief check that only one volume is build on the face nodes
+ * \brief fast check that only one volume is build on the face nodes
- *
- * If a face is shared by one of <ignoreVolumes>, it is considered free
  */
 //================================================================================
 
@@ -1503,6 +1501,45 @@ bool SMDS_VolumeTool::IsFreeFace( int faceIndex, const SMDS_MeshElement** otherV
 {
   const bool isFree = true;
 
+  if (!setFace( faceIndex ))
+    return !isFree;
+
+  const SMDS_MeshNode** nodes = GetFaceNodes( faceIndex );
+
+  // a set of facet nodes w/o medium ones and w/o nodes[0]
+  set< const SMDS_MeshNode* > nodeSet;
+  const int di = myVolume->IsQuadratic() ? 2 : 1;
+  for ( int i = di; i < myFaceNbNodes; i += di )
+    nodeSet.insert( nodes[i] );
+
+  SMDS_ElemIteratorPtr eIt = nodes[0]->GetInverseElementIterator( SMDSAbs_Volume );
+  while ( eIt->more() ) {
+    const SMDS_MeshElement* vol = eIt->next();
+    if ( vol != myVolume ) {
+      size_t nbShared = 0;
+      SMDS_NodeIteratorPtr nIt = vol->nodeIterator();
+      while ( nIt->more() )
+        if (( nbShared += nodeSet.count( nIt->next() )) == nodeSet.size() )
+        {
+          if ( otherVol ) *otherVol = vol;
+          return !isFree;
+        }
+    }
+  }
+  if ( otherVol ) *otherVol = 0;
+  return isFree;
+}
+
+//================================================================================
+/*!
+ * \brief Thorough check that only one volume is build on the face nodes
+ */
+//================================================================================
+
+bool SMDS_VolumeTool::IsFreeFaceAdv( int faceIndex, const SMDS_MeshElement** otherVol/*=0*/ ) const
+{
+  const bool isFree = true;
+
   if (!setFace( faceIndex ))
     return !isFree;
 
@@ -1621,15 +1658,17 @@ bool SMDS_VolumeTool::IsFreeFace( int faceIndex, const SMDS_MeshElement** otherV
 
 int SMDS_VolumeTool::GetFaceIndex( const set<const SMDS_MeshNode*>& theFaceNodes ) const
 {
-  for ( int iFace = 0; iFace < myNbFaces; iFace++ ) {
+  for ( int iFace = 0; iFace < myNbFaces; iFace++ )
+  {
+    const int nbNodes = NbFaceNodes( iFace );
+    if ( nbNodes == (int) theFaceNodes.size() )
+    {
       const SMDS_MeshNode** nodes = GetFaceNodes( iFace );
-    int nbFaceNodes = NbFaceNodes( iFace );
+      set<const SMDS_MeshNode*> nodeSet( nodes, nodes + nbNodes);
-    set<const SMDS_MeshNode*> nodeSet;
-    for ( int iNode = 0; iNode < nbFaceNodes; iNode++ )
-      nodeSet.insert( nodes[ iNode ] );
       if ( theFaceNodes == nodeSet )
         return iFace;
     }
+  }
   return -1;
 }
 

src/SMDS/SMDS_VolumeTool.hxx

@@ -73,6 +73,8 @@ class SMDS_EXPORT SMDS_VolumeTool
   int ID() const;
   // return element ID
 
+  bool IsPoly() const { return myPolyedre; }
+
   // -----------------------
   // general info
   // -----------------------
@@ -177,7 +179,11 @@ class SMDS_EXPORT SMDS_VolumeTool
   // SetExternalNormal() is taken into account.
 
   bool IsFreeFace(  int faceIndex, const SMDS_MeshElement** otherVol=0 ) const;
-  // Check that all volumes built on the face nodes lays on one side
+  // Fast check that only one volume is built on nodes of a given face
+  // otherVol returns another volume sharing the given facet
+
+  bool IsFreeFaceAdv(  int faceIndex, const SMDS_MeshElement** otherVol=0 ) const;
+  // Thorough check that all volumes built on the face nodes lays on one side
   // otherVol returns another volume sharing the given facet
 
   bool GetFaceNormal (int faceIndex, double & X, double & Y, double & Z) const;