smesh/src/Controls/SMESH_Controls.cxx

//  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS 
// 
//  This library is free software; you can redistribute it and/or 
//  modify it under the terms of the GNU Lesser General Public 
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License. 
// 
//  This library is distributed in the hope that it will be useful, 
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
//  Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public 
//  License along with this library; if not, write to the Free Software 
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
// 
//  See http://www.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org

#include "SMESH_Controls.hxx"

#include <set>

#include <BRep_Tool.hxx>
#include <gp_Ax3.hxx>
#include <gp_Cylinder.hxx>
#include <gp_Dir.hxx>
#include <gp_Pnt.hxx>
#include <gp_Pln.hxx>
#include <gp_Vec.hxx>
#include <gp_XYZ.hxx>
#include <Geom_Plane.hxx>
#include <Geom_CylindricalSurface.hxx>
#include <Precision.hxx>
#include <TColgp_Array1OfXYZ.hxx>
#include <TColgp_SequenceOfXYZ.hxx>
#include <TColStd_MapOfInteger.hxx>
#include <TColStd_SequenceOfAsciiString.hxx>
#include <TColStd_MapIteratorOfMapOfInteger.hxx>
#include <TopAbs.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS_Shape.hxx>

#include "SMDS_Mesh.hxx"
#include "SMDS_Iterator.hxx"
#include "SMDS_MeshElement.hxx"
#include "SMDS_MeshNode.hxx"



/*
                            AUXILIARY METHODS 
*/

static inline double getAngle( const gp_XYZ& P1, const gp_XYZ& P2, const gp_XYZ& P3 )
{
  gp_Vec v1( P1 - P2 ), v2( P3 - P2 );

  return v1.Magnitude() < gp::Resolution() ||
         v2.Magnitude() < gp::Resolution() ? 0 : v1.Angle( v2 );
}

static inline double getArea( const gp_XYZ& P1, const gp_XYZ& P2, const gp_XYZ& P3 )
{
  gp_Vec aVec1( P2 - P1 );
  gp_Vec aVec2( P3 - P1 );
  return ( aVec1 ^ aVec2 ).Magnitude() * 0.5;
}

static inline double getArea( const gp_Pnt& P1, const gp_Pnt& P2, const gp_Pnt& P3 )
{
  return getArea( P1.XYZ(), P2.XYZ(), P3.XYZ() );
}

static inline double getDistance( const gp_XYZ& P1, const gp_XYZ& P2 )
{
  double aDist = gp_Pnt( P1 ).Distance( gp_Pnt( P2 ) );
  return aDist;
}

static int getNbMultiConnection( SMDS_Mesh* theMesh, const int theId )
{
  if ( theMesh == 0 )
    return 0;

  const SMDS_MeshElement* anEdge = theMesh->FindElement( theId );
  if ( anEdge == 0 || anEdge->GetType() != SMDSAbs_Edge || anEdge->NbNodes() != 2 )
    return 0;

  TColStd_MapOfInteger aMap;

  int aResult = 0;
  SMDS_ElemIteratorPtr anIter = anEdge->nodesIterator();
  if ( anIter != 0 )
  {
    while( anIter->more() )
    {
      const SMDS_MeshNode* aNode = (SMDS_MeshNode*)anIter->next();
      if ( aNode == 0 )
        return 0;
      SMDS_ElemIteratorPtr anElemIter = aNode->GetInverseElementIterator();
      while( anElemIter->more() )
      {
        const SMDS_MeshElement* anElem = anElemIter->next();
        if ( anElem != 0 && anElem->GetType() != SMDSAbs_Edge )
        {
          int anId = anElem->GetID();

          if ( anIter->more() )              // i.e. first node
            aMap.Add( anId );
          else if ( aMap.Contains( anId ) )
            aResult++;
        }
      }
    }
  }

  return aResult;
}


using namespace SMESH::Controls;

/*
                                FUNCTORS
*/

/*
  Class       : NumericalFunctor
  Description : Base class for numerical functors
*/
NumericalFunctor::NumericalFunctor():
  myMesh(NULL)
{
  myPrecision = -1;
}

void NumericalFunctor::SetMesh( SMDS_Mesh* theMesh )
{
  myMesh = theMesh;
}

bool NumericalFunctor::GetPoints(const int             theId,
                                 TColgp_SequenceOfXYZ& theRes ) const
{
  theRes.Clear();

  if ( myMesh == 0 )
    return false;

  return GetPoints( myMesh->FindElement( theId ), theRes );
}

bool NumericalFunctor::GetPoints(const SMDS_MeshElement* anElem,
                                 TColgp_SequenceOfXYZ&   theRes )
{
  theRes.Clear();

  if ( anElem == 0)
    return false;

  // Get nodes of the element
  SMDS_ElemIteratorPtr anIter = anElem->nodesIterator();
  if ( anIter != 0 )
  {
    while( anIter->more() )
    {
      const SMDS_MeshNode* aNode = (SMDS_MeshNode*)anIter->next();
      if ( aNode != 0 )
        theRes.Append( gp_XYZ( aNode->X(), aNode->Y(), aNode->Z() ) );
    }
  }

  return true;
}

long  NumericalFunctor::GetPrecision() const
{
  return myPrecision;
}

void  NumericalFunctor::SetPrecision( const long thePrecision )
{
  myPrecision = thePrecision;
}

double NumericalFunctor::GetValue( long theId )
{
  TColgp_SequenceOfXYZ P;
  if ( GetPoints( theId, P ))
  {
    double aVal = GetValue( P );
    if ( myPrecision >= 0 )
    {
      double prec = pow( 10., (double)( myPrecision ) );
      aVal = floor( aVal * prec + 0.5 ) / prec;
    }
    
    return aVal;
  }

  return 0.;
}

/*
  Class       : MinimumAngle
  Description : Functor for calculation of minimum angle
*/

double MinimumAngle::GetValue( const TColgp_SequenceOfXYZ& P )
{
  double aMin;

  if ( P.Length() == 3 )
  {
    double A0 = getAngle( P( 3 ), P( 1 ), P( 2 ) );
    double A1 = getAngle( P( 1 ), P( 2 ), P( 3 ) );
    double A2 = getAngle( P( 2 ), P( 3 ), P( 1 ) );

    aMin = Min( A0, Min( A1, A2 ) );
  }
  else if ( P.Length() == 4 )
  {
    double A0 = getAngle( P( 4 ), P( 1 ), P( 2 ) );
    double A1 = getAngle( P( 1 ), P( 2 ), P( 3 ) );
    double A2 = getAngle( P( 2 ), P( 3 ), P( 4 ) );
    double A3 = getAngle( P( 3 ), P( 4 ), P( 1 ) );
    
    aMin = Min( Min( A0, A1 ), Min( A2, A3 ) );
  }
  else
    return 0.;
  
  return aMin * 180 / PI;
}

double MinimumAngle::GetBadRate( double Value, int nbNodes ) const
{
  const double aBestAngle = PI / nbNodes;
  return ( fabs( aBestAngle - Value ));
}

SMDSAbs_ElementType MinimumAngle::GetType() const
{
  return SMDSAbs_Face;
}


/*
  Class       : AspectRatio
  Description : Functor for calculating aspect ratio
*/
double AspectRatio::GetValue( const TColgp_SequenceOfXYZ& P )
{
  int nbNodes = P.Length();

  if ( nbNodes != 3 && nbNodes != 4 )
    return 0;

  // Compute lengths of the sides

  double aLen[ nbNodes ];
  for ( int i = 0; i < nbNodes - 1; i++ )
    aLen[ i ] = getDistance( P( i + 1 ), P( i + 2 ) );
  aLen[ nbNodes - 1 ] = getDistance( P( 1 ), P( nbNodes ) );

  // Compute aspect ratio

  if ( nbNodes == 3 ) 
  {
    double anArea = getArea( P( 1 ), P( 2 ), P( 3 ) );
    if ( anArea <= Precision::Confusion() )
      return 0.;
    double aMaxLen = Max( aLen[ 0 ], Max( aLen[ 1 ], aLen[ 2 ] ) );
    static double aCoef = sqrt( 3. ) / 4;

    return aCoef * aMaxLen * aMaxLen / anArea;
  }
  else
  {
    double aMinLen = Min( Min( aLen[ 0 ], aLen[ 1 ] ), Min( aLen[ 2 ], aLen[ 3 ] ) );
    if ( aMinLen <= Precision::Confusion() )
      return 0.;
    double aMaxLen = Max( Max( aLen[ 0 ], aLen[ 1 ] ), Max( aLen[ 2 ], aLen[ 3 ] ) );
    
    return aMaxLen / aMinLen;
  }
}

double AspectRatio::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  // the aspect ratio is in the range [1.0,infinity]
  // 1.0 = good
  // infinity = bad
  return Value / 1000.;
}

SMDSAbs_ElementType AspectRatio::GetType() const
{
  return SMDSAbs_Face;
}


/*
  Class       : AspectRatio3D
  Description : Functor for calculating aspect ratio
*/

static inline double getHalfPerimeter(double theTria[3]){
  return (theTria[0] + theTria[1] + theTria[2])/2.0;
}

static inline double getArea(double theHalfPerim, double theTria[3]){
  return sqrt(theHalfPerim*
	      (theHalfPerim-theTria[0])*
	      (theHalfPerim-theTria[1])*
	      (theHalfPerim-theTria[2]));
}

static inline double getVolume(double theLen[6]){
  double a2 = theLen[0]*theLen[0];
  double b2 = theLen[1]*theLen[1];
  double c2 = theLen[2]*theLen[2];
  double d2 = theLen[3]*theLen[3];
  double e2 = theLen[4]*theLen[4];
  double f2 = theLen[5]*theLen[5];
  double P = 4.0*a2*b2*d2;
  double Q = a2*(b2+d2-e2)-b2*(a2+d2-f2)-d2*(a2+b2-c2);
  double R = (b2+d2-e2)*(a2+d2-f2)*(a2+d2-f2);
  return sqrt(P-Q+R)/12.0;
}

static inline double getHeight( const gp_Pnt& P1, const gp_Pnt& P2, 
				const gp_Pnt& P3, const gp_Pnt& P4)
{
  gp_Vec aVec1( P2.XYZ() - P1.XYZ() );
  gp_Vec aVec2( P3.XYZ() - P1.XYZ() );
  gp_Vec aNorm = aVec1 ^ aVec2;
  aNorm /= aNorm.Magnitude();
  gp_Vec aVec3( P4.XYZ() - P1.XYZ() );
  double aDist = aVec1 * aVec2;
  return fabs( aDist );
}

static inline double getMaxHeight( const TColgp_SequenceOfXYZ& P )
{
  double aHeight = getHeight(P(1),P(2),P(3),P(4));
  aHeight = max(aHeight,getHeight(P(1),P(2),P(4),P(3)));
  aHeight = max(aHeight,getHeight(P(1),P(3),P(4),P(2)));
  aHeight = max(aHeight,getHeight(P(2),P(3),P(4),P(1)));
  return aHeight;
}

double AspectRatio3D::GetValue( const TColgp_SequenceOfXYZ& P )
{
  double aQuality = 0.0;
  int nbNodes = P.Length();
  switch(nbNodes){
  case 4:{
    double aLen[6] = {
      getDistance(P(1),P(2)), // a
      getDistance(P(2),P(3)), // b
      getDistance(P(3),P(1)), // c
      getDistance(P(2),P(4)), // d
      getDistance(P(3),P(4)), // e
      getDistance(P(1),P(4))  // f
    };
    double aTria[4][3] = {
      {aLen[0],aLen[1],aLen[2]}, // abc
      {aLen[0],aLen[3],aLen[5]}, // adf
      {aLen[1],aLen[3],aLen[4]}, // bde
      {aLen[2],aLen[4],aLen[5]}  // cef
    };
    double aHalfPerim = getHalfPerimeter(aTria[0]);
    double anArea = getArea(aHalfPerim,aTria[0]);
    aHalfPerim = getHalfPerimeter(aTria[1]);
    anArea += getArea(aHalfPerim,aTria[1]);
    aHalfPerim = getHalfPerimeter(aTria[2]);
    anArea += getArea(aHalfPerim,aTria[2]);
    double aVolume = getVolume(aLen);
    double aHeight = getMaxHeight(P);
    aQuality = 1.0/3.0*aHeight*anArea/aVolume;
    break;
  }
  }
  return aQuality;
}

double AspectRatio3D::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  // the aspect ratio is in the range [1.0,infinity]
  // 1.0 = good
  // infinity = bad
  return Value / 1000.;
}

SMDSAbs_ElementType AspectRatio3D::GetType() const
{
  return SMDSAbs_Volume;
}


/*
  Class       : Warping
  Description : Functor for calculating warping
*/
double Warping::GetValue( const TColgp_SequenceOfXYZ& P )
{
  if ( P.Length() != 4 )
    return 0;

  gp_XYZ G = ( P( 1 ) + P( 2 ) + P( 3 ) + P( 4 ) ) / 4;

  double A1 = ComputeA( P( 1 ), P( 2 ), P( 3 ), G );
  double A2 = ComputeA( P( 2 ), P( 3 ), P( 4 ), G );
  double A3 = ComputeA( P( 3 ), P( 4 ), P( 1 ), G );
  double A4 = ComputeA( P( 4 ), P( 1 ), P( 2 ), G );

  return Max( Max( A1, A2 ), Max( A3, A4 ) );
}

double Warping::ComputeA( const gp_XYZ& thePnt1,
                          const gp_XYZ& thePnt2,
                          const gp_XYZ& thePnt3,
                          const gp_XYZ& theG ) const
{
  double aLen1 = gp_Pnt( thePnt1 ).Distance( gp_Pnt( thePnt2 ) );
  double aLen2 = gp_Pnt( thePnt2 ).Distance( gp_Pnt( thePnt3 ) );
  double L = Min( aLen1, aLen2 ) * 0.5;
  if ( L < Precision::Confusion())
    return 0.;

  gp_XYZ GI = ( thePnt2 - thePnt1 ) / 2. - theG;
  gp_XYZ GJ = ( thePnt3 - thePnt2 ) / 2. - theG;
  gp_XYZ N  = GI.Crossed( GJ );

  if ( N.Modulus() < gp::Resolution() )
    return PI / 2;

  N.Normalize();

  double H = ( thePnt2 - theG ).Dot( N );
  return asin( fabs( H / L ) ) * 180 / PI;
}

double Warping::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  // the warp is in the range [0.0,PI/2]
  // 0.0 = good (no warp)
  // PI/2 = bad  (face pliee)
  return Value;
}

SMDSAbs_ElementType Warping::GetType() const
{
  return SMDSAbs_Face;
}


/*
  Class       : Taper
  Description : Functor for calculating taper
*/
double Taper::GetValue( const TColgp_SequenceOfXYZ& P )
{
  if ( P.Length() != 4 )
    return 0;

  // Compute taper
  double J1 = getArea( P( 4 ), P( 1 ), P( 2 ) ) / 2;
  double J2 = getArea( P( 3 ), P( 1 ), P( 2 ) ) / 2;
  double J3 = getArea( P( 2 ), P( 3 ), P( 4 ) ) / 2;
  double J4 = getArea( P( 3 ), P( 4 ), P( 1 ) ) / 2;

  double JA = 0.25 * ( J1 + J2 + J3 + J4 );
  if ( JA <= Precision::Confusion() )
    return 0.;

  double T1 = fabs( ( J1 - JA ) / JA );
  double T2 = fabs( ( J2 - JA ) / JA );
  double T3 = fabs( ( J3 - JA ) / JA );
  double T4 = fabs( ( J4 - JA ) / JA );

  return Max( Max( T1, T2 ), Max( T3, T4 ) );
}

double Taper::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  // the taper is in the range [0.0,1.0]
  // 0.0  = good (no taper)
  // 1.0 = bad  (les cotes opposes sont allignes)
  return Value;
}

SMDSAbs_ElementType Taper::GetType() const
{
  return SMDSAbs_Face;
}


/*
  Class       : Skew
  Description : Functor for calculating skew in degrees
*/
static inline double skewAngle( const gp_XYZ& p1, const gp_XYZ& p2, const gp_XYZ& p3 )
{
  gp_XYZ p12 = ( p2 + p1 ) / 2;
  gp_XYZ p23 = ( p3 + p2 ) / 2;
  gp_XYZ p31 = ( p3 + p1 ) / 2;

  gp_Vec v1( p31 - p2 ), v2( p12 - p23 );

  return v1.Magnitude() < gp::Resolution() || v2.Magnitude() < gp::Resolution() ? 0 : v1.Angle( v2 );
}

double Skew::GetValue( const TColgp_SequenceOfXYZ& P )
{
  if ( P.Length() != 3 && P.Length() != 4 )
    return 0;

  // Compute skew
  static double PI2 = PI / 2;
  if ( P.Length() == 3 )
  {
    double A0 = fabs( PI2 - skewAngle( P( 3 ), P( 1 ), P( 2 ) ) );
    double A1 = fabs( PI2 - skewAngle( P( 1 ), P( 2 ), P( 3 ) ) );
    double A2 = fabs( PI2 - skewAngle( P( 2 ), P( 3 ), P( 1 ) ) );

    return Max( A0, Max( A1, A2 ) ) * 180 / PI;
  }
  else 
  {
    gp_XYZ p12 = ( P( 1 ) + P( 2 ) ) / 2;
    gp_XYZ p23 = ( P( 2 ) + P( 3 ) ) / 2;
    gp_XYZ p34 = ( P( 3 ) + P( 4 ) ) / 2;
    gp_XYZ p41 = ( P( 4 ) + P( 1 ) ) / 2;

    gp_Vec v1( p34 - p12 ), v2( p23 - p41 );
    double A = v1.Magnitude() <= gp::Resolution() || v2.Magnitude() <= gp::Resolution()
      ? 0 : fabs( PI2 - v1.Angle( v2 ) );

    return A * 180 / PI;
  }
}

double Skew::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  // the skew is in the range [0.0,PI/2].
  // 0.0 = good
  // PI/2 = bad
  return Value;
}

SMDSAbs_ElementType Skew::GetType() const
{
  return SMDSAbs_Face;
}


/*
  Class       : Area
  Description : Functor for calculating area
*/
double Area::GetValue( const TColgp_SequenceOfXYZ& P )
{
  if ( P.Length() == 3 )
    return getArea( P( 1 ), P( 2 ), P( 3 ) );
  else if ( P.Length() == 4 )
    return getArea( P( 1 ), P( 2 ), P( 3 ) ) + getArea( P( 1 ), P( 3 ), P( 4 ) );
  else
    return 0;
}

double Area::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  return Value;
}

SMDSAbs_ElementType Area::GetType() const
{
  return SMDSAbs_Face;
}


/*
  Class       : Length
  Description : Functor for calculating length off edge
*/
double Length::GetValue( const TColgp_SequenceOfXYZ& P )
{
  return ( P.Length() == 2 ? getDistance( P( 1 ), P( 2 ) ) : 0 );
}

double Length::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  return Value;
}

SMDSAbs_ElementType Length::GetType() const
{
  return SMDSAbs_Edge;
}


/*
  Class       : MultiConnection
  Description : Functor for calculating number of faces conneted to the edge
*/
double MultiConnection::GetValue( const TColgp_SequenceOfXYZ& P )
{
  return 0;
}
double MultiConnection::GetValue( long theId )
{
  return getNbMultiConnection( myMesh, theId );
}

double MultiConnection::GetBadRate( double Value, int /*nbNodes*/ ) const
{
  return Value;
}

SMDSAbs_ElementType MultiConnection::GetType() const
{
  return SMDSAbs_Edge;
}


/*
                            PREDICATES
*/

/*
  Class       : FreeBorders
  Description : Predicate for free borders
*/

FreeBorders::FreeBorders()
{
  myMesh = 0;
}

void FreeBorders::SetMesh( SMDS_Mesh* theMesh )
{
  myMesh = theMesh;
}

bool FreeBorders::IsSatisfy( long theId )
{
  return getNbMultiConnection( myMesh, theId ) == 1;
}

SMDSAbs_ElementType FreeBorders::GetType() const
{
  return SMDSAbs_Edge;
}


/*
  Class       : FreeEdges
  Description : Predicate for free Edges
*/
FreeEdges::FreeEdges()
{
  myMesh = 0;
}

void FreeEdges::SetMesh( SMDS_Mesh* theMesh )
{
  myMesh = theMesh;
}

bool FreeEdges::IsFreeEdge( const SMDS_MeshNode** theNodes, const int theFaceId  )
{
  TColStd_MapOfInteger aMap;
  for ( int i = 0; i < 2; i++ )
  {
    SMDS_ElemIteratorPtr anElemIter = theNodes[ i ]->GetInverseElementIterator();
    while( anElemIter->more() )
    {
      const SMDS_MeshElement* anElem = anElemIter->next();
      if ( anElem != 0 && anElem->GetType() == SMDSAbs_Face )
      {
        int anId = anElem->GetID();

        if ( i == 0 ) 
          aMap.Add( anId );
        else if ( aMap.Contains( anId ) && anId != theFaceId )
          return false;
      }
    }
  }
  return true;
}

bool FreeEdges::IsSatisfy( long theId )
{
  if ( myMesh == 0 )
    return false;

  const SMDS_MeshElement* aFace = myMesh->FindElement( theId );
  if ( aFace == 0 || aFace->GetType() != SMDSAbs_Face || aFace->NbNodes() < 3 )
    return false;

  int nbNodes = aFace->NbNodes();
  const SMDS_MeshNode* aNodes[ nbNodes ];
  int i = 0;
  SMDS_ElemIteratorPtr anIter = aFace->nodesIterator();
  if ( anIter != 0 )
  {
    while( anIter->more() )
    {
      const SMDS_MeshNode* aNode = (SMDS_MeshNode*)anIter->next();
      if ( aNode == 0 )
        return false;
      aNodes[ i++ ] = aNode;
    }
  }

  for ( int i = 0; i < nbNodes - 1; i++ )
    if ( IsFreeEdge( &aNodes[ i ], theId ) )
      return true;

  aNodes[ 1 ] = aNodes[ nbNodes - 1 ];
  
  return IsFreeEdge( &aNodes[ 0 ], theId );

}

SMDSAbs_ElementType FreeEdges::GetType() const
{
  return SMDSAbs_Face;
}

FreeEdges::Border::Border(long theElemId, long thePntId1, long thePntId2):
  myElemId(theElemId)
{
  myPntId[0] = thePntId1;  myPntId[1] = thePntId2;
  if(thePntId1 > thePntId2){
    myPntId[1] = thePntId1;  myPntId[0] = thePntId2;
  }
}

bool FreeEdges::Border::operator<(const FreeEdges::Border& x) const{
  if(myPntId[0] < x.myPntId[0]) return true;
  if(myPntId[0] == x.myPntId[0])
    if(myPntId[1] < x.myPntId[1]) return true;
  return false;
}

inline void UpdateBorders(const FreeEdges::Border& theBorder,
			  FreeEdges::TBorders& theRegistry, 
			  FreeEdges::TBorders& theContainer)
{
  if(theRegistry.find(theBorder) == theRegistry.end()){
    theRegistry.insert(theBorder);
    theContainer.insert(theBorder);
  }else{
    theContainer.erase(theBorder);
  }
}

void FreeEdges::GetBoreders(TBorders& theBorders)
{
  TBorders aRegistry;
  SMDS_FaceIteratorPtr anIter = myMesh->facesIterator();
  for(; anIter->more(); ){
    const SMDS_MeshFace* anElem = anIter->next();
    long anElemId = anElem->GetID();
    SMDS_ElemIteratorPtr aNodesIter = anElem->nodesIterator();
    long aNodeId[2];
    const SMDS_MeshElement* aNode;
    if(aNodesIter->more()){
      aNode = aNodesIter->next();
      aNodeId[0] = aNodeId[1] = aNode->GetID();
    }	
    for(; aNodesIter->more(); ){
      aNode = aNodesIter->next();
      long anId = aNode->GetID();
      Border aBorder(anElemId,aNodeId[1],anId);
      aNodeId[1] = anId;
      //std::cout<<aBorder.myPntId[0]<<"; "<<aBorder.myPntId[1]<<"; "<<aBorder.myElemId<<endl;
      UpdateBorders(aBorder,aRegistry,theBorders);
    }
    Border aBorder(anElemId,aNodeId[0],aNodeId[1]);
    //std::cout<<aBorder.myPntId[0]<<"; "<<aBorder.myPntId[1]<<"; "<<aBorder.myElemId<<endl;
    UpdateBorders(aBorder,aRegistry,theBorders);
  }
  //std::cout<<"theBorders.size() = "<<theBorders.size()<<endl;
}

/*
  Class       : RangeOfIds
  Description : Predicate for Range of Ids.
                Range may be specified with two ways.
                1. Using AddToRange method
                2. With SetRangeStr method. Parameter of this method is a string
                   like as "1,2,3,50-60,63,67,70-"
*/

//=======================================================================
// name    : RangeOfIds
// Purpose : Constructor
//=======================================================================
RangeOfIds::RangeOfIds()
{
  myMesh = 0;
  myType = SMDSAbs_All;
}

//=======================================================================
// name    : SetMesh
// Purpose : Set mesh 
//=======================================================================
void RangeOfIds::SetMesh( SMDS_Mesh* theMesh )
{
  myMesh = theMesh;
}

//=======================================================================
// name    : AddToRange
// Purpose : Add ID to the range
//=======================================================================
bool RangeOfIds::AddToRange( long theEntityId )
{
  myIds.Add( theEntityId );
  return true;
}

//=======================================================================
// name    : GetRangeStr
// Purpose : Get range as a string.
//           Example: "1,2,3,50-60,63,67,70-"
//=======================================================================
void RangeOfIds::GetRangeStr( TCollection_AsciiString& theResStr )
{
  theResStr.Clear();

  TColStd_SequenceOfInteger     anIntSeq;
  TColStd_SequenceOfAsciiString aStrSeq;

  TColStd_MapIteratorOfMapOfInteger anIter( myIds );
  for ( ; anIter.More(); anIter.Next() )
  {
    int anId = anIter.Key();
    TCollection_AsciiString aStr( anId );
    anIntSeq.Append( anId );
    aStrSeq.Append( aStr );
  }

  for ( int i = 1, n = myMin.Length(); i <= n; i++ )
  {
    int aMinId = myMin( i );
    int aMaxId = myMax( i );

    TCollection_AsciiString aStr;
    if ( aMinId != IntegerFirst() )
      aStr += aMinId;
      
    aStr += "-";
      
    if ( aMaxId != IntegerLast() )
      aStr += aMaxId;

    // find position of the string in result sequence and insert string in it
    if ( anIntSeq.Length() == 0 )
    {
      anIntSeq.Append( aMinId );
      aStrSeq.Append( aStr );
    }
    else
    {
      if ( aMinId < anIntSeq.First() )
      {
        anIntSeq.Prepend( aMinId );
        aStrSeq.Prepend( aStr );
      }
      else if ( aMinId > anIntSeq.Last() )
      {
        anIntSeq.Append( aMinId );
        aStrSeq.Append( aStr );
      }
      else
        for ( int j = 1, k = anIntSeq.Length(); j <= k; j++ )
          if ( aMinId < anIntSeq( j ) )
          {
            anIntSeq.InsertBefore( j, aMinId );
            aStrSeq.InsertBefore( j, aStr );
            break;
          }
    }
  }

  if ( aStrSeq.Length() == 0 )
    return;

  theResStr = aStrSeq( 1 );
  for ( int j = 2, k = aStrSeq.Length(); j <= k; j++  )
  {
    theResStr += ",";
    theResStr += aStrSeq( j );
  }
}

//=======================================================================
// name    : SetRangeStr
// Purpose : Define range with string
//           Example of entry string: "1,2,3,50-60,63,67,70-"
//=======================================================================
bool RangeOfIds::SetRangeStr( const TCollection_AsciiString& theStr )
{
  myMin.Clear();
  myMax.Clear();
  myIds.Clear();

  TCollection_AsciiString aStr = theStr;
  aStr.RemoveAll( ' ' );
  aStr.RemoveAll( '\t' );

  for ( int aPos = aStr.Search( ",," ); aPos != -1; aPos = aStr.Search( ",," ) )
    aStr.Remove( aPos, 2 );

  TCollection_AsciiString tmpStr = aStr.Token( ",", 1 );
  int i = 1;
  while ( tmpStr != "" )
  {
    tmpStr = aStr.Token( ",", i++ );
    int aPos = tmpStr.Search( '-' );
    
    if ( aPos == -1 )
    {
      if ( tmpStr.IsIntegerValue() )
        myIds.Add( tmpStr.IntegerValue() );
      else
        return false;
    }
    else
    {
      TCollection_AsciiString aMaxStr = tmpStr.Split( aPos );
      TCollection_AsciiString aMinStr = tmpStr;
      
      while ( aMinStr.Search( "-" ) != -1 ) aMinStr.RemoveAll( '-' );
      while ( aMaxStr.Search( "-" ) != -1 ) aMaxStr.RemoveAll( '-' );

      if ( !aMinStr.IsEmpty() && !aMinStr.IsIntegerValue() ||
           !aMaxStr.IsEmpty() && !aMaxStr.IsIntegerValue() )
        return false;
           
      myMin.Append( aMinStr.IsEmpty() ? IntegerFirst() : aMinStr.IntegerValue() );
      myMax.Append( aMaxStr.IsEmpty() ? IntegerLast()  : aMaxStr.IntegerValue() );
    }
  }

  return true;
}

//=======================================================================
// name    : GetType
// Purpose : Get type of supported entities
//=======================================================================
SMDSAbs_ElementType RangeOfIds::GetType() const
{
  return myType;
}

//=======================================================================
// name    : SetType
// Purpose : Set type of supported entities
//=======================================================================
void RangeOfIds::SetType( SMDSAbs_ElementType theType )
{
  myType = theType;
}

//=======================================================================
// name    : IsSatisfy
// Purpose : Verify whether entity satisfies to this rpedicate
//=======================================================================
bool RangeOfIds::IsSatisfy( long theId )
{
  if ( !myMesh )
    return false;

  if ( myType == SMDSAbs_Node )
  {
    if ( myMesh->FindNode( theId ) == 0 )
      return false;
  }
  else
  {
    const SMDS_MeshElement* anElem = myMesh->FindElement( theId );
    if ( anElem == 0 || myType != anElem->GetType() && myType != SMDSAbs_All )
      return false;
  }
    
  if ( myIds.Contains( theId ) )
    return true;

  for ( int i = 1, n = myMin.Length(); i <= n; i++ )
    if ( theId >= myMin( i ) && theId <= myMax( i ) )
      return true;

  return false;
}

/*
  Class       : Comparator
  Description : Base class for comparators
*/
Comparator::Comparator():
  myMargin(0)
{}

Comparator::~Comparator()
{}

void Comparator::SetMesh( SMDS_Mesh* theMesh )
{
  if ( myFunctor )
    myFunctor->SetMesh( theMesh );
}

void Comparator::SetMargin( double theValue )
{
  myMargin = theValue;
}

void Comparator::SetNumFunctor( NumericalFunctorPtr theFunct )
{
  myFunctor = theFunct;
}

SMDSAbs_ElementType Comparator::GetType() const
{
  return myFunctor ? myFunctor->GetType() : SMDSAbs_All;
}

double Comparator::GetMargin()
{
  return myMargin;
}


/*
  Class       : LessThan
  Description : Comparator "<"
*/
bool LessThan::IsSatisfy( long theId )
{
  return myFunctor && myFunctor->GetValue( theId ) < myMargin;
}


/*
  Class       : MoreThan
  Description : Comparator ">"
*/
bool MoreThan::IsSatisfy( long theId )
{
  return myFunctor && myFunctor->GetValue( theId ) > myMargin;
}


/*
  Class       : EqualTo
  Description : Comparator "="
*/
EqualTo::EqualTo():
  myToler(Precision::Confusion())
{}

bool EqualTo::IsSatisfy( long theId )
{
  return myFunctor && fabs( myFunctor->GetValue( theId ) - myMargin ) < myToler;
}

void EqualTo::SetTolerance( double theToler )
{
  myToler = theToler;
}

double EqualTo::GetTolerance()
{
  return myToler;
}

/*
  Class       : LogicalNOT
  Description : Logical NOT predicate
*/
LogicalNOT::LogicalNOT()
{}

LogicalNOT::~LogicalNOT()
{}

bool LogicalNOT::IsSatisfy( long theId )
{
  return myPredicate && !myPredicate->IsSatisfy( theId );
}

void LogicalNOT::SetMesh( SMDS_Mesh* theMesh )
{
  if ( myPredicate )
    myPredicate->SetMesh( theMesh );
}

void LogicalNOT::SetPredicate( PredicatePtr thePred )
{
  myPredicate = thePred;
}

SMDSAbs_ElementType LogicalNOT::GetType() const
{
  return myPredicate ? myPredicate->GetType() : SMDSAbs_All;
}


/*
  Class       : LogicalBinary
  Description : Base class for binary logical predicate
*/
LogicalBinary::LogicalBinary()
{}

LogicalBinary::~LogicalBinary()
{}

void LogicalBinary::SetMesh( SMDS_Mesh* theMesh )
{
  if ( myPredicate1 )
    myPredicate1->SetMesh( theMesh );

  if ( myPredicate2 )
    myPredicate2->SetMesh( theMesh );
}

void LogicalBinary::SetPredicate1( PredicatePtr thePredicate )
{
  myPredicate1 = thePredicate;
}

void LogicalBinary::SetPredicate2( PredicatePtr thePredicate )
{
  myPredicate2 = thePredicate;
}

SMDSAbs_ElementType LogicalBinary::GetType() const
{
  if ( !myPredicate1 || !myPredicate2 )
    return SMDSAbs_All;

  SMDSAbs_ElementType aType1 = myPredicate1->GetType();
  SMDSAbs_ElementType aType2 = myPredicate2->GetType();

  return aType1 == aType2 ? aType1 : SMDSAbs_All;
}


/*
  Class       : LogicalAND
  Description : Logical AND
*/
bool LogicalAND::IsSatisfy( long theId )
{
  return 
    myPredicate1 && 
    myPredicate2 && 
    myPredicate1->IsSatisfy( theId ) && 
    myPredicate2->IsSatisfy( theId );
}


/*
  Class       : LogicalOR
  Description : Logical OR
*/
bool LogicalOR::IsSatisfy( long theId )
{
  return 
    myPredicate1 && 
    myPredicate2 && 
    myPredicate1->IsSatisfy( theId ) || 
    myPredicate2->IsSatisfy( theId );
}


/*
                              FILTER
*/

Filter::Filter()
{}

Filter::~Filter()
{}

void Filter::SetPredicate( PredicatePtr thePredicate )
{
  myPredicate = thePredicate;
}


template<class TElement, class TIterator, class TPredicate> 
void FillSequence(const TIterator& theIterator,
		  TPredicate& thePredicate,
		  Filter::TIdSequence& theSequence)
{
  if ( theIterator ) {
    while( theIterator->more() ) {
      TElement anElem = theIterator->next();
      long anId = anElem->GetID();
      if ( thePredicate->IsSatisfy( anId ) )
	theSequence.push_back( anId );
    }
  }
}

Filter::TIdSequence
Filter::GetElementsId( SMDS_Mesh* theMesh )
{
  TIdSequence aSequence;
  if ( !theMesh || !myPredicate ) return aSequence;

  myPredicate->SetMesh( theMesh );

  SMDSAbs_ElementType aType = myPredicate->GetType();
  switch(aType){
  case SMDSAbs_Node:{
    FillSequence<const SMDS_MeshNode*>(theMesh->nodesIterator(),myPredicate,aSequence);
    break;
  }
  case SMDSAbs_Edge:{
    FillSequence<const SMDS_MeshElement*>(theMesh->edgesIterator(),myPredicate,aSequence);
    break;
  }
  case SMDSAbs_Face:{
    FillSequence<const SMDS_MeshElement*>(theMesh->facesIterator(),myPredicate,aSequence);
    break;
  }
  case SMDSAbs_Volume:{
    FillSequence<const SMDS_MeshElement*>(theMesh->volumesIterator(),myPredicate,aSequence);
    break;
  }
  case SMDSAbs_All:{
    FillSequence<const SMDS_MeshElement*>(theMesh->edgesIterator(),myPredicate,aSequence);
    FillSequence<const SMDS_MeshElement*>(theMesh->facesIterator(),myPredicate,aSequence);
    FillSequence<const SMDS_MeshElement*>(theMesh->volumesIterator(),myPredicate,aSequence);
    break;
  }
  }
  return aSequence;
}

/*
                              ManifoldPart
*/

typedef std::set<SMDS_MeshFace*>                    TMapOfFacePtr;

/*  
   Internal class Link
*/ 

ManifoldPart::Link::Link( SMDS_MeshNode* theNode1,
                          SMDS_MeshNode* theNode2 )
{
  myNode1 = theNode1;
  myNode2 = theNode2;
}

ManifoldPart::Link::~Link()
{
  myNode1 = 0;
  myNode2 = 0;
}

bool ManifoldPart::Link::IsEqual( const ManifoldPart::Link& theLink ) const
{
  if ( myNode1 == theLink.myNode1 &&
       myNode2 == theLink.myNode2 )
    return true;
  else if ( myNode1 == theLink.myNode2 &&
            myNode2 == theLink.myNode1 )
    return true;
  else
    return false;
}

bool ManifoldPart::Link::operator<( const ManifoldPart::Link& x ) const
{
  if(myNode1 < x.myNode1) return true;
  if(myNode1 == x.myNode1)
    if(myNode2 < x.myNode2) return true;
  return false;
}

bool ManifoldPart::IsEqual( const ManifoldPart::Link& theLink1,
                            const ManifoldPart::Link& theLink2 )
{ 
  return theLink1.IsEqual( theLink2 );
}

ManifoldPart::ManifoldPart()
{
  myMesh = 0;
  myAngToler = Precision::Angular();
  myIsOnlyManifold = true;
}

ManifoldPart::~ManifoldPart()
{
  myMesh = 0;
}

void ManifoldPart::SetMesh( SMDS_Mesh* theMesh )
{
  myMesh = theMesh;
  process();
}

SMDSAbs_ElementType ManifoldPart::GetType() const
{ return SMDSAbs_Face; }

bool ManifoldPart::IsSatisfy( long theElementId )
{
  return myMapIds.Contains( theElementId );
}

void ManifoldPart::SetAngleTolerance( const double theAngToler )
{ myAngToler = theAngToler; }

double ManifoldPart::GetAngleTolerance() const
{ return myAngToler; }

void ManifoldPart::SetIsOnlyManifold( const bool theIsOnly )
{ myIsOnlyManifold = theIsOnly; }

void ManifoldPart::SetStartElem( const long  theStartId )
{ myStartElemId = theStartId; }

bool ManifoldPart::process()
{
  myMapIds.Clear();
  myMapBadGeomIds.Clear();
  
  myAllFacePtr.clear();
  myAllFacePtrIntDMap.clear();
  if ( !myMesh )
    return false;

  // collect all faces into own map
  SMDS_FaceIteratorPtr anFaceItr = myMesh->facesIterator();
  for (; anFaceItr->more(); )
  {
    SMDS_MeshFace* aFacePtr = (SMDS_MeshFace*)anFaceItr->next();
    myAllFacePtr.push_back( aFacePtr );
    myAllFacePtrIntDMap[aFacePtr] = myAllFacePtr.size()-1;
  }

  SMDS_MeshFace* aStartFace = (SMDS_MeshFace*)myMesh->FindElement( myStartElemId );
  if ( !aStartFace )
    return false;

  // the map of non manifold links and bad geometry
  TMapOfLink aMapOfNonManifold;
  TColStd_MapOfInteger aMapOfTreated;

  // begin cycle on faces from start index and run on vector till the end
  //  and from begin to start index to cover whole vector
  const int aStartIndx = myAllFacePtrIntDMap[aStartFace];
  bool isStartTreat = false;
  for ( int fi = aStartIndx; !isStartTreat || fi != aStartIndx ; fi++ )
  {
    if ( fi == aStartIndx )
      isStartTreat = true;
    // as result next time when fi will be equal to aStartIndx
    
    SMDS_MeshFace* aFacePtr = myAllFacePtr[ fi ];
    if ( aMapOfTreated.Contains( aFacePtr->GetID() ) )
      continue;

    aMapOfTreated.Add( aFacePtr->GetID() );
    TColStd_MapOfInteger aResFaces;
    if ( !findConnected( myAllFacePtrIntDMap, aFacePtr,
                         aMapOfNonManifold, aResFaces ) )
      continue;
    TColStd_MapIteratorOfMapOfInteger anItr( aResFaces );
    for ( ; anItr.More(); anItr.Next() )
    {
      int aFaceId = anItr.Key();
      aMapOfTreated.Add( aFaceId );
      myMapIds.Add( aFaceId );
    }

    if ( fi == ( myAllFacePtr.size() - 1 ) )
      fi = 0;
  } // end run on vector of faces
  return !myMapIds.IsEmpty();
}

static void getLinks( const SMDS_MeshFace* theFace,
                      ManifoldPart::TVectorOfLink& theLinks )
{
  int aNbNode = theFace->NbNodes();
  SMDS_ElemIteratorPtr aNodeItr = theFace->nodesIterator();
  int i = 1;
  SMDS_MeshNode* aNode = 0;
  for ( ; aNodeItr->more() && i <= aNbNode; )
  {
    
    SMDS_MeshNode* aN1 = (SMDS_MeshNode*)aNodeItr->next();
    if ( i == 1 )
      aNode = aN1;
    i++;
    SMDS_MeshNode* aN2 = ( i >= aNbNode ) ? aNode : (SMDS_MeshNode*)aNodeItr->next();
    i++;
    ManifoldPart::Link aLink( aN1, aN2 );
    theLinks.push_back( aLink );
  }
}

static gp_XYZ getNormale( const SMDS_MeshFace* theFace )
{
  gp_XYZ n;
  int aNbNode = theFace->NbNodes();
  TColgp_Array1OfXYZ anArrOfXYZ(1,4);
  gp_XYZ p1, p2, p3, p4;
  SMDS_ElemIteratorPtr aNodeItr = theFace->nodesIterator();
  int i = 1;
  for ( ; aNodeItr->more() && i <= 4; i++ )
  {
    SMDS_MeshNode* aNode = (SMDS_MeshNode*)aNodeItr->next();
    anArrOfXYZ.SetValue(i, gp_XYZ( aNode->X(), aNode->Y(), aNode->Z() ) );
  }
  
  gp_XYZ q1 = anArrOfXYZ.Value(2) - anArrOfXYZ.Value(1);
  gp_XYZ q2 = anArrOfXYZ.Value(3) - anArrOfXYZ.Value(1);
  n  = q1 ^ q2;
  if ( aNbNode > 3 )
  {
    gp_XYZ q3 = anArrOfXYZ.Value(4) - anArrOfXYZ.Value(1);
    n += q2 ^ q3;
  }
  double len = n.Modulus();
  if ( len > 0 )
    n /= len;

  return n;
}

bool ManifoldPart::findConnected
                 ( const ManifoldPart::TDataMapFacePtrInt& theAllFacePtrInt,
                  SMDS_MeshFace*                           theStartFace,
                  ManifoldPart::TMapOfLink&                theNonManifold,
                  TColStd_MapOfInteger&                    theResFaces )
{
  theResFaces.Clear();
  if ( !theAllFacePtrInt.size() )
    return false;
  
  if ( getNormale( theStartFace ).SquareModulus() <= gp::Resolution() )
  {
    myMapBadGeomIds.Add( theStartFace->GetID() );
    return false;
  }

  ManifoldPart::TMapOfLink aMapOfBoundary, aMapToSkip;
  ManifoldPart::TVectorOfLink aSeqOfBoundary;
  theResFaces.Add( theStartFace->GetID() );
  ManifoldPart::TDataMapOfLinkFacePtr aDMapLinkFace;

  expandBoundary( aMapOfBoundary, aSeqOfBoundary, 
                 aDMapLinkFace, theNonManifold, theStartFace );

  bool isDone = false;
  while ( !isDone && aMapOfBoundary.size() != 0 )
  {
    bool isToReset = false;
    ManifoldPart::TVectorOfLink::iterator pLink = aSeqOfBoundary.begin();
    for ( ; !isToReset && pLink != aSeqOfBoundary.end(); ++pLink )
    {
      ManifoldPart::Link aLink = *pLink;
      if ( aMapToSkip.find( aLink ) != aMapToSkip.end() )
        continue;
      // each link could be treated only once
      aMapToSkip.insert( aLink );

      ManifoldPart::TVectorOfFacePtr aFaces;
      // find next
      if ( myIsOnlyManifold && 
           (theNonManifold.find( aLink ) != theNonManifold.end()) )
        continue;
      else
      {
        getFacesByLink( aLink, aFaces );
        // filter the element to keep only indicated elements
        ManifoldPart::TVectorOfFacePtr aFiltered;
        ManifoldPart::TVectorOfFacePtr::iterator pFace = aFaces.begin();
        for ( ; pFace != aFaces.end(); ++pFace )
        {
          SMDS_MeshFace* aFace = *pFace;
          if ( myAllFacePtrIntDMap.find( aFace ) != myAllFacePtrIntDMap.end() )
            aFiltered.push_back( aFace );
        }
        aFaces = aFiltered;
        if ( aFaces.size() < 2 )  // no neihgbour faces
          continue;
        else if ( myIsOnlyManifold && aFaces.size() > 2 ) // non manifold case
        {
          theNonManifold.insert( aLink );
          continue;
        }
      }
      
      // compare normal with normals of neighbor element
      SMDS_MeshFace* aPrevFace = aDMapLinkFace[ aLink ];
      ManifoldPart::TVectorOfFacePtr::iterator pFace = aFaces.begin();
      for ( ; pFace != aFaces.end(); ++pFace )
      {
        SMDS_MeshFace* aNextFace = *pFace;
        if ( aPrevFace == aNextFace )
          continue;
        int anNextFaceID = aNextFace->GetID();
        if ( myIsOnlyManifold && theResFaces.Contains( anNextFaceID ) )
         // should not be with non manifold restriction. probably bad topology
          continue;
        // check if face was treated and skipped
        if ( myMapBadGeomIds.Contains( anNextFaceID ) ||
             !isInPlane( aPrevFace, aNextFace ) )
          continue;
        // add new element to connected and extend the boundaries.
        theResFaces.Add( anNextFaceID );
        expandBoundary( aMapOfBoundary, aSeqOfBoundary, 
                        aDMapLinkFace, theNonManifold, aNextFace );
        isToReset = true;
      }
    }
    isDone = !isToReset;
  }

  return !theResFaces.IsEmpty();
}

bool ManifoldPart::isInPlane( const SMDS_MeshFace* theFace1,
                              const SMDS_MeshFace* theFace2 )
{
  gp_Dir aNorm1 = gp_Dir( getNormale( theFace1 ) );
  gp_XYZ aNorm2XYZ = getNormale( theFace2 );
  if ( aNorm2XYZ.SquareModulus() <= gp::Resolution() )
  {
    myMapBadGeomIds.Add( theFace2->GetID() );
    return false;
  }
  if ( aNorm1.IsParallel( gp_Dir( aNorm2XYZ ), myAngToler ) )
    return true;

  return false;
}

void ManifoldPart::expandBoundary
                   ( ManifoldPart::TMapOfLink&            theMapOfBoundary,
                     ManifoldPart::TVectorOfLink&         theSeqOfBoundary,
                     ManifoldPart::TDataMapOfLinkFacePtr& theDMapLinkFacePtr,
                     ManifoldPart::TMapOfLink&            theNonManifold,
                     SMDS_MeshFace*                       theNextFace ) const
{
  ManifoldPart::TVectorOfLink aLinks;
  getLinks( theNextFace, aLinks );
  int aNbLink = aLinks.size();
  for ( int i = 0; i < aNbLink; i++ )
  {
    ManifoldPart::Link aLink = aLinks[ i ];
    if ( myIsOnlyManifold && (theNonManifold.find( aLink ) != theNonManifold.end()) )
      continue;
    if ( theMapOfBoundary.find( aLink ) != theMapOfBoundary.end() )
    {
      if ( myIsOnlyManifold )
      {
        // remove from boundary
        theMapOfBoundary.erase( aLink );
        ManifoldPart::TVectorOfLink::iterator pLink = theSeqOfBoundary.begin();
        for ( ; pLink != theSeqOfBoundary.end(); ++pLink )
        {
          ManifoldPart::Link aBoundLink = *pLink;
          if ( aBoundLink.IsEqual( aLink ) )
          {
            theSeqOfBoundary.erase( pLink );
            break;
          }
        }
      }
    }
    else
    {
      theMapOfBoundary.insert( aLink );
      theSeqOfBoundary.push_back( aLink );
      theDMapLinkFacePtr[ aLink ] = theNextFace;
    }
  }
}

void ManifoldPart::getFacesByLink( const ManifoldPart::Link& theLink,
                                   ManifoldPart::TVectorOfFacePtr& theFaces ) const
{
  SMDS_Mesh::SetOfFaces aSetOfFaces;
  // take all faces that shared first node
  SMDS_ElemIteratorPtr anItr = theLink.myNode1->facesIterator();
  for ( ; anItr->more(); )
  {
    SMDS_MeshFace* aFace = (SMDS_MeshFace*)anItr->next();
    if ( !aFace )
      continue;
    aSetOfFaces.insert( aFace );
  }
  // take all faces that shared second node
  anItr = theLink.myNode2->facesIterator();
  // find the common part of two sets
  for ( ; anItr->more(); )
  {
    SMDS_MeshFace* aFace = (SMDS_MeshFace*)anItr->next();
    if ( aSetOfFaces.find( aFace ) != aSetOfFaces.end() )
      theFaces.push_back( aFace );
  }
}


/*
   ElementsOnSurface
*/

ElementsOnSurface::ElementsOnSurface()
{
  myMesh = 0;
  myIds.Clear();
  myType = SMDSAbs_All;
  mySurf.Nullify();
  myToler = Precision::Confusion();
}

ElementsOnSurface::~ElementsOnSurface()
{
  myMesh = 0;
}

void ElementsOnSurface::SetMesh( SMDS_Mesh* theMesh )
{ 
  if ( myMesh == theMesh )
    return;
  myMesh = theMesh;
  myIds.Clear();
  process();
}

bool ElementsOnSurface::IsSatisfy( long theElementId )
{
  return myIds.Contains( theElementId );
}

SMDSAbs_ElementType ElementsOnSurface::GetType() const
{ return myType; }

void ElementsOnSurface::SetTolerance( const double theToler )
{ myToler = theToler; }

double ElementsOnSurface::GetTolerance() const
{
  return myToler;
}

void ElementsOnSurface::SetSurface( const TopoDS_Shape& theShape,
                                    const SMDSAbs_ElementType theType )
{
  myType = theType;
  mySurf.Nullify();
  if ( theShape.IsNull() || theShape.ShapeType() != TopAbs_FACE )
  {
    mySurf.Nullify();
    return;
  }
  TopoDS_Face aFace = TopoDS::Face( theShape );
  mySurf = BRep_Tool::Surface( aFace );
}

void ElementsOnSurface::process()
{
  myIds.Clear();
  if ( mySurf.IsNull() )
    return;

  if ( myMesh == 0 )
    return;

  if ( myType == SMDSAbs_Face || myType == SMDSAbs_All )
  {
    SMDS_FaceIteratorPtr anIter = myMesh->facesIterator();
    for(; anIter->more(); )
      process( anIter->next() );
  }

  if ( myType == SMDSAbs_Edge || myType == SMDSAbs_All )
  {
    SMDS_EdgeIteratorPtr anIter = myMesh->edgesIterator();
    for(; anIter->more(); )
      process( anIter->next() );
  }

  if ( myType == SMDSAbs_Node )
  {
    SMDS_NodeIteratorPtr anIter = myMesh->nodesIterator();
    for(; anIter->more(); )
      process( anIter->next() );
  }
}

void ElementsOnSurface::process( const SMDS_MeshElement* theElemPtr )
{
  SMDS_ElemIteratorPtr aNodeItr = theElemPtr->nodesIterator();
  bool isSatisfy = true;
  for ( ; aNodeItr->more(); )
  {
    SMDS_MeshNode* aNode = (SMDS_MeshNode*)aNodeItr->next();
    if ( !isOnSurface( aNode ) )
    {
      isSatisfy = false;
      break;
    }
  }
  if ( isSatisfy )
    myIds.Add( theElemPtr->GetID() );
}

bool ElementsOnSurface::isOnSurface( const SMDS_MeshNode* theNode ) const
{
  if ( mySurf.IsNull() )
    return false;

  gp_Pnt aPnt( theNode->X(), theNode->Y(), theNode->Z() );
  double aToler2 = myToler * myToler;
  if ( mySurf->IsKind(STANDARD_TYPE(Geom_Plane)))
  {
    gp_Pln aPln = Handle(Geom_Plane)::DownCast(mySurf)->Pln();
    if ( aPln.SquareDistance( aPnt ) > aToler2 )
      return false;
  }
  else if ( mySurf->IsKind(STANDARD_TYPE(Geom_CylindricalSurface)))
  {
    gp_Cylinder aCyl = Handle(Geom_CylindricalSurface)::DownCast(mySurf)->Cylinder();
    double aRad = aCyl.Radius();
    gp_Ax3 anAxis = aCyl.Position();
    gp_XYZ aLoc = aCyl.Location().XYZ();
    double aXDist = anAxis.XDirection().XYZ() * ( aPnt.XYZ() - aLoc );
    double aYDist = anAxis.YDirection().XYZ() * ( aPnt.XYZ() - aLoc );
    if ( fabs(aXDist*aXDist + aYDist*aYDist - aRad*aRad) > aToler2 )
      return false;
  }
  else
    return false;

  return true;
}