PAL7451. Now RotationSweep() and ExtrusionSweep() call makeWalls()

This commit is contained in:
eap 2005-01-12 06:49:46 +00:00
parent a35771f3a5
commit 91a00132d4

View File

@ -51,8 +51,11 @@
using namespace std;
typedef map<const SMDS_MeshNode*, const SMDS_MeshNode*> TNodeNodeMap;
typedef map<const SMDS_MeshNode*, list<const SMDS_MeshNode*> > TNodeOfNodeListMap;
typedef map<const SMDS_MeshElement*, list<const SMDS_MeshNode*> > TElemOfNodeListMap;
typedef map<const SMDS_MeshElement*, list<const SMDS_MeshElement*> > TElemOfElemListMap;
typedef map<const SMDS_MeshNode*, list<const SMDS_MeshNode*> > TNodeOfNodeListMap;
typedef TNodeOfNodeListMap::iterator TNodeOfNodeListMapItr;
typedef map<const SMDS_MeshElement*, vector<TNodeOfNodeListMapItr> > TElemOfVecOfNnlmiMap;
//=======================================================================
//function : SMESH_MeshEditor
@ -1472,7 +1475,9 @@ void SMESH_MeshEditor::Smooth (set<const SMDS_MeshElement*> & theElems,
//=======================================================================
//function : isReverse
//purpose :
//purpose : Return true if normal of prevNodes is not co-directied with
// gp_Vec(prevNodes[iNotSame],nextNodes[iNotSame]).
// iNotSame is where prevNodes and nextNodes are different
//=======================================================================
static bool isReverse(const SMDS_MeshNode* prevNodes[],
@ -1505,37 +1510,34 @@ static bool isReverse(const SMDS_MeshNode* prevNodes[],
static void sweepElement(SMESHDS_Mesh* aMesh,
const SMDS_MeshElement* elem,
const TNodeOfNodeListMap& mapNewNodes )
const vector<TNodeOfNodeListMapItr> & newNodesItVec,
list<const SMDS_MeshElement*>& newElems)
{
// Loop on elem nodes:
// find new nodes and detect same nodes indices
list<const SMDS_MeshNode*>::const_iterator itNN[ 4 ];
const SMDS_MeshNode* prevNod[ 4 ], *nextNod[ 4 ];
int nbSame = 0, iNotSameNode = 0, iSameNode = 0;
int nbNodes = elem->NbNodes();
list<const SMDS_MeshNode*>::const_iterator itNN[ nbNodes ];
const SMDS_MeshNode* prevNod[ nbNodes ], *nextNod[ nbNodes ];
int iNode, nbSame = 0, iNotSameNode = 0, iSameNode = 0;
TNodeOfNodeListMap::const_iterator mapIt;
int iNode = 0;
SMDS_ElemIteratorPtr itN = elem->nodesIterator();
while ( itN->more() )
for ( iNode = 0; iNode < nbNodes; iNode++ )
{
const SMDS_MeshNode* node =
static_cast<const SMDS_MeshNode*>( itN->next() );
mapIt = mapNewNodes.find( node );
if ( mapIt == mapNewNodes.end() )
return; // not duplicated node
TNodeOfNodeListMapItr nnIt = newNodesItVec[ iNode ];
const SMDS_MeshNode* node = nnIt->first;
const list< const SMDS_MeshNode* > & listNewNodes = nnIt->second;
if ( listNewNodes.empty() )
return;
itNN[ iNode ] = (*mapIt).second.begin();
itNN[ iNode ] = listNewNodes.begin();
prevNod[ iNode ] = node;
nextNod[ iNode ] = (*mapIt).second.front();
nextNod[ iNode ] = listNewNodes.front();
if ( prevNod[ iNode ] != nextNod [ iNode ])
iNotSameNode = iNode;
else {
iSameNode = iNode;
nbSame++;
}
iNode++;
}
int nbNodes = iNode;
if ( nbSame == nbNodes || nbSame > 2) {
MESSAGE( " Too many same nodes of element " << elem->GetID() );
return;
@ -1550,8 +1552,8 @@ static void sweepElement(SMESHDS_Mesh* aMesh,
// check element orientation
int i0 = 0, i2 = 2;
if ( nbNodes > 2 && isReverse( prevNod, nextNod, nbNodes, iNotSameNode )) {
// MESSAGE("Reversed elem " << elem->GetID() );
if ( nbNodes > 2 && !isReverse( prevNod, nextNod, nbNodes, iNotSameNode )) {
//MESSAGE("Reversed elem " << elem );
i0 = 2;
i2 = 0;
if ( nbSame > 0 ) {
@ -1562,7 +1564,7 @@ static void sweepElement(SMESHDS_Mesh* aMesh,
}
// make new elements
int iStep, nbSteps = (*mapIt).second.size();
int iStep, nbSteps = newNodesItVec[ 0 ]->second.size();
for (iStep = 0; iStep < nbSteps; iStep++ )
{
// get next nodes
@ -1570,69 +1572,76 @@ static void sweepElement(SMESHDS_Mesh* aMesh,
nextNod[ iNode ] = *itNN[ iNode ];
itNN[ iNode ]++;
}
SMDS_MeshElement* aNewElem = 0;
switch ( nbNodes )
{
case 1: { // NODE
if ( nbSame == 0 )
aNewElem = aMesh->AddEdge( prevNod[ 0 ], nextNod[ 0 ] );
break;
}
case 2: { // EDGE
if ( nbSame == 0 )
aMesh->AddFace( prevNod[ 0 ], prevNod[ 1 ], nextNod[ 1 ], nextNod[ 0 ] );
aNewElem = aMesh->AddFace(prevNod[ 0 ], prevNod[ 1 ],
nextNod[ 1 ], nextNod[ 0 ] );
else
aMesh->AddFace( prevNod[ 0 ], prevNod[ 1 ], nextNod[ iNotSameNode ] );
aNewElem = aMesh->AddFace(prevNod[ 0 ], prevNod[ 1 ],
nextNod[ iNotSameNode ] );
break;
}
case 3: { // TRIANGLE
if ( nbSame == 0 ) // --- 1 pentahedron
{
aMesh->AddVolume (prevNod[ i2 ], prevNod[ 1 ], prevNod[ i0 ],
nextNod[ i2 ], nextNod[ 1 ], nextNod[ i0 ] );
}
else if ( nbSame == 1 ) // --- 2 tetrahedrons
{
aMesh->AddVolume (prevNod[ i0 ], prevNod[ 1 ], prevNod[ i2 ],
nextNod[ iBeforeSame ]);
aMesh->AddVolume (nextNod[ i2 ], nextNod[ 1 ], nextNod[ i0 ],
prevNod[ iAfterSame ]);
}
else // 2 same nodes: --- 1 tetrahedron
{
aMesh->AddVolume (prevNod[ i0 ], prevNod[ 1 ], prevNod[ i2 ],
if ( nbSame == 0 ) // --- pentahedron
aNewElem = aMesh->AddVolume (prevNod[ i0 ], prevNod[ 1 ], prevNod[ i2 ],
nextNod[ i0 ], nextNod[ 1 ], nextNod[ i2 ] );
else if ( nbSame == 1 ) // --- pyramid
aNewElem = aMesh->AddVolume (prevNod[ iAfterSame ], prevNod[ iBeforeSame ],
nextNod[ iBeforeSame ], nextNod[ iAfterSame ],
nextNod[ iSameNode ]);
else // 2 same nodes: --- tetrahedron
aNewElem = aMesh->AddVolume (prevNod[ i0 ], prevNod[ 1 ], prevNod[ i2 ],
nextNod[ iNotSameNode ]);
}
break;
}
case 4: { // QUADRANGLE
if ( nbSame == 0 ) // --- 1 hexahedron
{
aMesh->AddVolume (prevNod[ i0 ], prevNod[ 1 ], prevNod[ i2 ], prevNod[ 3 ],
if ( nbSame == 0 ) // --- hexahedron
aNewElem = aMesh->AddVolume (prevNod[ i0 ], prevNod[ 1 ], prevNod[ i2 ], prevNod[ 3 ],
nextNod[ i0 ], nextNod[ 1 ], nextNod[ i2 ], nextNod[ 3 ]);
}
else if ( nbSame == 1 ) // --- 2 tetrahedrons + 1 pentahedron
else if ( nbSame == 1 ) // --- pyramid + pentahedron
{
aMesh->AddVolume (prevNod[ iBeforeSame ], prevNod[ iSameNode ],
prevNod[ iAfterSame ], nextNod[ iBeforeSame ]);
aMesh->AddVolume (nextNod[ iAfterSame ], nextNod[ iSameNode ],
nextNod[ iBeforeSame ], prevNod[ iAfterSame ]);
aMesh->AddVolume (prevNod[ iBeforeSame ], prevNod[ iOpposSame ], prevNod[ iAfterSame ],
nextNod[ iBeforeSame ], nextNod[ iOpposSame ], nextNod[ iAfterSame ] );
aNewElem = aMesh->AddVolume (prevNod[ iAfterSame ], prevNod[ iBeforeSame ],
nextNod[ iBeforeSame ], nextNod[ iAfterSame ],
nextNod[ iSameNode ]);
newElems.push_back( aNewElem );
aNewElem = aMesh->AddVolume (prevNod[ iBeforeSame ], prevNod[ iOpposSame ],
prevNod[ iAfterSame ], nextNod[ iBeforeSame ],
nextNod[ iOpposSame ], nextNod[ iAfterSame ] );
}
else if ( nbSame == 2 ) // 1 pentahedron
else if ( nbSame == 2 ) // pentahedron
{
if ( prevNod[ iBeforeSame ] == nextNod[ iBeforeSame ] )
// iBeforeSame is same too
aMesh->AddVolume (prevNod[ iOpposSame ], prevNod[ iBeforeSame ], nextNod[ iOpposSame ],
prevNod[ iAfterSame ], prevNod[ iSameNode ], nextNod[ iAfterSame ]);
aNewElem = aMesh->AddVolume (prevNod[ iOpposSame ], prevNod[ iBeforeSame ],
nextNod[ iOpposSame ], prevNod[ iAfterSame ],
prevNod[ iSameNode ], nextNod[ iAfterSame ]);
else
// iAfterSame is same too
aMesh->AddVolume (prevNod[ iBeforeSame ], prevNod[ iSameNode ], nextNod[ iBeforeSame ],
prevNod[ iOpposSame ], prevNod[ iAfterSame ], nextNod[ iOpposSame ]);
aNewElem = aMesh->AddVolume (prevNod[ iBeforeSame ], prevNod[ iSameNode ],
nextNod[ iBeforeSame ], prevNod[ iOpposSame ],
prevNod[ iAfterSame ], nextNod[ iOpposSame ]);
}
break;
}
default:
return;
}
if ( aNewElem )
newElems.push_back( aNewElem );
// set new prev nodes
for ( iNode = 0; iNode < nbNodes; iNode++ )
@ -1641,6 +1650,156 @@ static void sweepElement(SMESHDS_Mesh* aMesh,
} // for steps
}
//=======================================================================
//function : makeWalls
//purpose : create 1D and 2D elements around swept elements
//=======================================================================
static void makeWalls (SMESHDS_Mesh* aMesh,
TNodeOfNodeListMap& mapNewNodes,
TElemOfElemListMap& newElemsMap,
TElemOfVecOfNnlmiMap& elemNewNodesMap,
set<const SMDS_MeshElement*>& elemSet)
{
ASSERT( newElemsMap.size() == elemNewNodesMap.size() );
// Find nodes belonging to only one initial element - sweep them to get edges.
TNodeOfNodeListMapItr nList = mapNewNodes.begin();
for ( ; nList != mapNewNodes.end(); nList++ )
{
const SMDS_MeshNode* node =
static_cast<const SMDS_MeshNode*>( nList->first );
SMDS_ElemIteratorPtr eIt = node->GetInverseElementIterator();
int nbInitElems = 0;
while ( eIt->more() && nbInitElems < 2 )
if ( elemSet.find( eIt->next() ) != elemSet.end() )
nbInitElems++;
if ( nbInitElems < 2 ) {
vector<TNodeOfNodeListMapItr> newNodesItVec( 1, nList );
list<const SMDS_MeshElement*> newEdges;
sweepElement( aMesh, node, newNodesItVec, newEdges );
}
}
// Make a ceiling for each element ie an equal element of last new nodes.
// Find free links of faces - make edges and sweep them into faces.
TElemOfElemListMap::iterator itElem = newElemsMap.begin();
TElemOfVecOfNnlmiMap::iterator itElemNodes = elemNewNodesMap.begin();
for ( ; itElem != newElemsMap.end(); itElem++, itElemNodes++ )
{
const SMDS_MeshElement* elem = itElem->first;
vector<TNodeOfNodeListMapItr>& vecNewNodes = itElemNodes->second;
bool hasFreeLinks = false;
set<const SMDS_MeshElement*> avoidSet;
avoidSet.insert( elem );
// loop on element nodes
int iNode, nbNodes = vecNewNodes.size();
vector<const SMDS_MeshNode*> lastNewNode( nbNodes ); // to make ceiling
for ( iNode = 0; iNode < nbNodes; iNode++ )
{
lastNewNode[ iNode ] = vecNewNodes[ iNode ]->second.back();
// look for free links of a face
if ( elem->GetType() == SMDSAbs_Face )
{
// get 2 nodes
int iNext = ( iNode + 1 == nbNodes ) ? 0 : iNode + 1;
const SMDS_MeshNode* n1 = vecNewNodes[ iNode ]->first;
const SMDS_MeshNode* n2 = vecNewNodes[ iNext ]->first;
// check if a link is free
if ( ! SMESH_MeshEditor::FindFaceInSet ( n1, n2, elemSet, avoidSet ))
{
hasFreeLinks = true;
// make an edge and a ceiling for a new edge
if ( !aMesh->FindEdge( n1, n2 ))
aMesh->AddEdge( n1, n2 );
n1 = vecNewNodes[ iNode ]->second.back();
n2 = vecNewNodes[ iNext ]->second.back();
if ( !aMesh->FindEdge( n1, n2 ))
aMesh->AddEdge( n1, n2 );
}
}
}
// sweep free links into faces
if ( hasFreeLinks )
{
list<const SMDS_MeshElement*> & newVolumes = itElem->second;
int iStep, nbSteps = vecNewNodes[0]->second.size();
int iVol, volNb, nbVolumesByStep = newVolumes.size() / nbSteps;
set<const SMDS_MeshNode*> initNodeSet, faceNodeSet;
for ( iNode = 0; iNode < nbNodes; iNode++ )
initNodeSet.insert( vecNewNodes[ iNode ]->first );
for ( volNb = 0; volNb < nbVolumesByStep; volNb++ )
{
list<const SMDS_MeshElement*>::iterator v = newVolumes.begin();
iVol = 0;
while ( iVol++ < volNb ) v++;
// find indices of free faces of a volume
list< int > fInd;
SMDS_VolumeTool vTool( *v );
int iF, nbF = vTool.NbFaces();
for ( iF = 0; iF < nbF; iF ++ )
if (vTool.IsFreeFace( iF ) &&
vTool.GetFaceNodes( iF, faceNodeSet ) &&
initNodeSet != faceNodeSet) // except an initial face
fInd.push_back( iF );
if ( fInd.empty() )
continue;
// create faces for all steps
for ( iStep = 0; iStep < nbSteps; iStep++ )
{
vTool.Set( *v );
vTool.SetExternalNormal();
list< int >::iterator ind = fInd.begin();
for ( ; ind != fInd.end(); ind++ )
{
const SMDS_MeshNode** nodes = vTool.GetFaceNodes( *ind );
switch ( vTool.NbFaceNodes( *ind ) ) {
case 3:
aMesh->AddFace( nodes[ 0 ], nodes[ 1 ], nodes[ 2 ] ); break;
case 4:
aMesh->AddFace( nodes[ 0 ], nodes[ 1 ], nodes[ 2 ], nodes[ 3 ] ); break;
}
}
// go to the next volume
iVol = 0;
while ( iVol++ < nbVolumesByStep ) v++;
}
}
} // sweep free links into faces
// create a ceiling element, faces will be reversed
switch ( nbNodes ) {
case 2:
aMesh->AddEdge(lastNewNode[ 0 ], lastNewNode[ 1 ]);
break;
case 3:
if (!hasFreeLinks ||
!aMesh->FindFace( lastNewNode[ 0 ], lastNewNode[ 2 ], lastNewNode[ 1 ]))
aMesh->AddFace (lastNewNode[ 0 ], lastNewNode[ 2 ], lastNewNode[ 1 ]);
break;
case 4:
if (!hasFreeLinks ||
!aMesh->FindFace (lastNewNode[ 0 ], lastNewNode[ 3 ],
lastNewNode[ 2 ], lastNewNode[ 1 ]))
aMesh->AddFace (lastNewNode[ 0 ], lastNewNode[ 3 ],
lastNewNode[ 2 ], lastNewNode[ 1 ]);
break;
}
} // loop on elements
}
//=======================================================================
//function : RotationSweep
//purpose :
@ -1652,6 +1811,7 @@ void SMESH_MeshEditor::RotationSweep(set<const SMDS_MeshElement*> & theElems,
const int theNbSteps,
const double theTol)
{
MESSAGE( "RotationSweep()");
gp_Trsf aTrsf;
aTrsf.SetRotation( theAxis, theAngle );
@ -1661,17 +1821,18 @@ void SMESH_MeshEditor::RotationSweep(set<const SMDS_MeshElement*> & theElems,
SMESHDS_Mesh* aMesh = GetMeshDS();
TNodeOfNodeListMap mapNewNodes;
TElemOfVecOfNnlmiMap mapElemNewNodes;
TElemOfElemListMap newElemsMap;
// loop on theElems
set< const SMDS_MeshElement* >::iterator itElem;
for ( itElem = theElems.begin(); itElem != theElems.end(); itElem++ )
{
// check element type
const SMDS_MeshElement* elem = (*itElem);
if ( !elem ||
(elem->GetType() != SMDSAbs_Face &&
elem->GetType() != SMDSAbs_Edge ))
if ( !elem )
continue;
vector<TNodeOfNodeListMapItr> & newNodesItVec = mapElemNewNodes[ elem ];
newNodesItVec.reserve( elem->NbNodes() );
// loop on elem nodes
SMDS_ElemIteratorPtr itN = elem->nodesIterator();
@ -1680,10 +1841,11 @@ void SMESH_MeshEditor::RotationSweep(set<const SMDS_MeshElement*> & theElems,
// check if a node has been already sweeped
const SMDS_MeshNode* node =
static_cast<const SMDS_MeshNode*>( itN->next() );
if (mapNewNodes.find( node ) != mapNewNodes.end() )
continue;
list<const SMDS_MeshNode*>& listNewNodes = mapNewNodes[ node ];
TNodeOfNodeListMapItr nIt = mapNewNodes.find( node );
if ( nIt == mapNewNodes.end() )
{
nIt = mapNewNodes.insert( make_pair( node, list<const SMDS_MeshNode*>() )).first;
list<const SMDS_MeshNode*>& listNewNodes = nIt->second;
// make new nodes
gp_XYZ aXYZ( node->X(), node->Y(), node->Z() );
@ -1699,9 +1861,14 @@ void SMESH_MeshEditor::RotationSweep(set<const SMDS_MeshElement*> & theElems,
listNewNodes.push_back( newNode );
}
}
// make new elements
sweepElement( aMesh, elem, mapNewNodes );
newNodesItVec.push_back( nIt );
}
// make new elements
sweepElement( aMesh, elem, newNodesItVec, newElemsMap[elem] );
}
makeWalls( aMesh, mapNewNodes, newElemsMap, mapElemNewNodes, theElems );
}
//=======================================================================
//function : ExtrusionSweep
@ -1718,6 +1885,8 @@ void SMESH_MeshEditor::ExtrusionSweep(set<const SMDS_MeshElement*> & theElems,
SMESHDS_Mesh* aMesh = GetMeshDS();
TNodeOfNodeListMap mapNewNodes;
TElemOfVecOfNnlmiMap mapElemNewNodes;
TElemOfElemListMap newElemsMap;
// loop on theElems
set< const SMDS_MeshElement* >::iterator itElem;
@ -1725,11 +1894,12 @@ void SMESH_MeshEditor::ExtrusionSweep(set<const SMDS_MeshElement*> & theElems,
{
// check element type
const SMDS_MeshElement* elem = (*itElem);
if ( !elem ||
(elem->GetType() != SMDSAbs_Face &&
elem->GetType() != SMDSAbs_Edge))
if ( !elem )
continue;
vector<TNodeOfNodeListMapItr> & newNodesItVec = mapElemNewNodes[ elem ];
newNodesItVec.reserve( elem->NbNodes() );
// loop on elem nodes
SMDS_ElemIteratorPtr itN = elem->nodesIterator();
while ( itN->more() ) {
@ -1737,25 +1907,28 @@ void SMESH_MeshEditor::ExtrusionSweep(set<const SMDS_MeshElement*> & theElems,
// check if a node has been already sweeped
const SMDS_MeshNode* node =
static_cast<const SMDS_MeshNode*>( itN->next() );
if (mapNewNodes.find( node ) != mapNewNodes.end() )
continue;
list<const SMDS_MeshNode*>& listNewNodes = mapNewNodes[ node ];
TNodeOfNodeListMap::iterator nIt = mapNewNodes.find( node );
if ( nIt == mapNewNodes.end() )
{
nIt = mapNewNodes.insert( make_pair( node, list<const SMDS_MeshNode*>() )).first;
list<const SMDS_MeshNode*>& listNewNodes = nIt->second;
// make new nodes
double coord[3];
coord[0] = node->X();
coord[1] = node->Y();
coord[2] = node->Z();
double coord[] = { node->X(), node->Y(), node->Z() };
for ( int i = 0; i < theNbSteps; i++ ) {
aTrsf.Transforms( coord[0], coord[1], coord[2] );
const SMDS_MeshNode * newNode = aMesh->AddNode( coord[0], coord[1], coord[2] );
listNewNodes.push_back( newNode );
}
}
// make new elements
sweepElement( aMesh, elem, mapNewNodes );
newNodesItVec.push_back( nIt );
}
// make new elements
sweepElement( aMesh, elem, newNodesItVec, newElemsMap[elem] );
}
makeWalls( aMesh, mapNewNodes, newElemsMap, mapElemNewNodes, theElems );
}
//=======================================================================
@ -2353,23 +2526,31 @@ void SMESH_MeshEditor::MergeEqualElements()
}
//=======================================================================
//function : findAdjacentFace
//purpose :
//function : FindFaceInSet
//purpose : Return a face having linked nodes n1 and n2 and which is
// - not in avoidSet,
// - in elemSet provided that !elemSet.empty()
//=======================================================================
#define CHECKIND(max,val) {if ( (val) >= (max) ) \
static const SMDS_MeshElement* findAdjacentFace(const SMDS_MeshNode* n1,
const SMDS_MeshElement*
SMESH_MeshEditor::FindFaceInSet(const SMDS_MeshNode* n1,
const SMDS_MeshNode* n2,
const SMDS_MeshElement* elem)
const set<const SMDS_MeshElement*>& elemSet,
const set<const SMDS_MeshElement*>& avoidSet)
{
SMDS_ElemIteratorPtr invElemIt = n1->facesIterator();
SMDS_ElemIteratorPtr invElemIt = n1->GetInverseElementIterator();
while ( invElemIt->more() ) { // loop on inverse elements of n1
const SMDS_MeshElement* adjElem = invElemIt->next();
if ( elem != adjElem ) {
const SMDS_MeshElement* elem = invElemIt->next();
if (elem->GetType() != SMDSAbs_Face ||
avoidSet.find( elem ) != avoidSet.end() )
continue;
if ( !elemSet.empty() && elemSet.find( elem ) == elemSet.end())
continue;
// get face nodes and find index of n1
int i1, nbN = adjElem->NbNodes(), iNode = 0;
int i1, nbN = elem->NbNodes(), iNode = 0;
const SMDS_MeshNode* faceNodes[ nbN ], *n;
SMDS_ElemIteratorPtr nIt = adjElem->nodesIterator();
SMDS_ElemIteratorPtr nIt = elem->nodesIterator();
while ( nIt->more() ) {
faceNodes[ iNode ] = static_cast<const SMDS_MeshNode*>( nIt->next() );
if ( faceNodes[ iNode++ ] == n1 )
@ -2382,13 +2563,27 @@ static const SMDS_MeshElement* findAdjacentFace(const SMDS_MeshNode* n1,
else // node after n1
n = faceNodes[ i1 + 1 == nbN ? 0 : i1 + 1 ];
if ( n == n2 )
return adjElem;
}
return elem;
}
}
return 0;
}
//=======================================================================
//function : findAdjacentFace
//purpose :
//=======================================================================
static const SMDS_MeshElement* findAdjacentFace(const SMDS_MeshNode* n1,
const SMDS_MeshNode* n2,
const SMDS_MeshElement* elem)
{
set<const SMDS_MeshElement*> elemSet, avoidSet;
if ( elem )
avoidSet.insert ( elem );
SMESH_MeshEditor::FindFaceInSet( n1, n2, elemSet, avoidSet );
}
//=======================================================================
//function : findFreeBorder
//purpose :