path: root/src/TopOpeBRepTool/TopOpeBRepTool_ShapeClassifier.cxx

// File:	TopOpeBRepTool_ShapeClassifier.cxx
// Created:	Tue Feb  1 18:18:54 1994
// Author:	Jean Yves LEBEY
//		<jyl@phobox>

#include <TopOpeBRepTool_ShapeClassifier.ixx>
#include <BRepClass_FaceClassifier.hxx>
#include <BRepTopAdaptor_FClass2d.hxx>
#include <BRep_Tool.hxx>
#include <TopoDS.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <Geom_Curve.hxx>
#include <Geom2d_Curve.hxx>
#include <gp_Vec2d.hxx>
#include <Precision.hxx>
#include <Standard_ProgramError.hxx>
#include <BRepClass_FacePassiveClassifier.hxx>
#include <BRepClass3d_SolidExplorer.hxx>
#include <BRepClass_Edge.hxx>
#include <BRepAdaptor_Curve2d.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <TopOpeBRepTool_CurveTool.hxx>
#include <TopOpeBRepTool_define.hxx>
#include <TopOpeBRepTool_2d.hxx>

//=======================================================================
//function : TopOpeBRepTool_ShapeClassifier
//purpose  : 
//=======================================================================

TopOpeBRepTool_ShapeClassifier::TopOpeBRepTool_ShapeClassifier() :
myP3Ddef(Standard_False),myP2Ddef(Standard_False)
{
}

//=======================================================================
//function : TopOpeBRepTool_ShapeClassifier
//purpose  : 
//=======================================================================

TopOpeBRepTool_ShapeClassifier::TopOpeBRepTool_ShapeClassifier
(const TopoDS_Shape& SRef) :myP3Ddef(Standard_False),myP2Ddef(Standard_False)
{
  myRef = SRef;
}

//=======================================================================
//function : ClearAll
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::ClearAll()
{
  ClearCurrent();
  mySolidClassifier.Clear();
}

//=======================================================================
//function : ClearCurrent
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::ClearCurrent()
{
  mySameDomain = -1;
  myS.Nullify();
  myRef.Nullify();
  myAvS.Nullify();
  myMapAvS.Clear();
  mymre.Clear();
  mymren = 0;
  mymredone = Standard_False;
  myState = TopAbs_UNKNOWN;
  myEdge.Nullify();
  myFace.Nullify();
  myP3Ddef = myP2Ddef = Standard_False;
}

//=======================================================================
//function : SameDomain
//purpose  : 
//=======================================================================

Standard_Integer TopOpeBRepTool_ShapeClassifier::SameDomain() const
{
  return mySameDomain;
}

//=======================================================================
//function : SameDomain
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::SameDomain(const Standard_Integer sam)
{
  mySameDomain = sam;
}

//=======================================================================
//function : SetReference
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::SetReference(const TopoDS_Shape& SRef)
{
  myRef = SRef;
  MapRef();
}

//=======================================================================
//function : MapRef
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::MapRef()
{
  mymre.Clear();  
  mymren = 0;
  if (myRef.ShapeType() == TopAbs_FACE && mySameDomain == 1) {
    TopExp::MapShapes(myRef,TopAbs_EDGE,mymre);
    mymren = mymre.Extent();
    if (mymren == 1) {
      TopExp_Explorer x(myRef,TopAbs_EDGE);
      const TopoDS_Edge& E = TopoDS::Edge(x.Current());
      TopoDS_Vertex v1,v2;TopExp::Vertices(E,v1,v2);
      if (v1.IsSame(v2)) mymren = 0; 
    }
  }
  mymredone = Standard_True;
}
  
//=======================================================================
//function : StateShapeShape
//purpose  : 
//=======================================================================

TopAbs_State TopOpeBRepTool_ShapeClassifier::StateShapeShape
(const TopoDS_Shape& S,const TopoDS_Shape& SRef,const Standard_Integer samedomain)  
{
  ClearCurrent();
  mySameDomain = samedomain;
  myS = S;
  myAvS.Nullify();
  myPAvLS = NULL;
  myRef = SRef;
  Perform();
  return myState;
}

//=======================================================================
//function : StateShapeShape
//purpose  : 
//=======================================================================

TopAbs_State TopOpeBRepTool_ShapeClassifier::StateShapeShape
(const TopoDS_Shape& S,const TopoDS_Shape& AvS,const TopoDS_Shape& SRef)  
{
  ClearCurrent();
  myS = S;
  myAvS = AvS;
  myPAvLS = NULL;
  myRef = SRef;
  Perform();
  return myState;
}

//=======================================================================
//function : StateShapeShape
//purpose  : 
//=======================================================================

TopAbs_State TopOpeBRepTool_ShapeClassifier::StateShapeShape
(const TopoDS_Shape& S, const TopTools_ListOfShape& AvLS,const TopoDS_Shape& SRef)  
{
  ClearCurrent();
  myS = S;
  myAvS.Nullify();
  myPAvLS = (TopTools_ListOfShape*)&AvLS;
  myRef = SRef;
  Perform();
  return myState;
}

//=======================================================================
//function : StateShapeReference
//purpose  : 
//=======================================================================

TopAbs_State TopOpeBRepTool_ShapeClassifier::StateShapeReference
(const TopoDS_Shape& S,const TopoDS_Shape& AvS)
{
  myS = S;
  myAvS = AvS;
  myPAvLS = NULL;
  Perform();
  return myState;
}

//=======================================================================
//function : StateShapeReference
//purpose  : 
//=======================================================================

TopAbs_State TopOpeBRepTool_ShapeClassifier::StateShapeReference
(const TopoDS_Shape& S,const TopTools_ListOfShape& AvLS)
{
  myS = S;
  myAvS.Nullify();
  myPAvLS = (TopTools_ListOfShape*)&AvLS;
  Perform();
  return myState;
}

//=======================================================================
//function : ChangeSolidClassifier
//purpose  : 
//=======================================================================

TopOpeBRepTool_SolidClassifier& TopOpeBRepTool_ShapeClassifier::ChangeSolidClassifier()
{
  return mySolidClassifier;
}

//=======================================================================
//function : FindEdge
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::FindEdge()
{
  myEdge.Nullify();
  myFace.Nullify();

  TopAbs_ShapeEnum t = myS.ShapeType();
  if ( t < TopAbs_FACE ) { // compsolid .. shell
    FindFace(myS);
    FindEdge(myFace);
  }
  else {
    FindEdge(myS);
  }
}

//=======================================================================
//function : FindEdge
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::FindEdge(const TopoDS_Shape& S)
{
  myEdge.Nullify();
  Standard_Boolean isavls = HasAvLS();
  Standard_Boolean isavs = (! myAvS.IsNull());
  if (S.IsNull()) return;

  TopAbs_ShapeEnum tS = S.ShapeType();
  TopExp_Explorer eex;
  if ( ! myFace.IsNull() ) eex.Init(myFace,TopAbs_EDGE);
  else eex.Init(S,TopAbs_EDGE);

  for(; eex.More(); eex.Next()) {
    const TopoDS_Edge& E = TopoDS::Edge(eex.Current());
    Standard_Boolean toavoid = Standard_False;
    if ( isavls || isavs ) {
      toavoid = toavoid || myMapAvS.Contains(E);
      if (!myAvS.IsNull()) toavoid = toavoid || E.IsSame(myAvS);
    }      
    else if ( BRep_Tool::Degenerated(E) ) toavoid = ( tS != TopAbs_EDGE );
    if ( toavoid ) continue;
    myEdge = E;
    break;
  }
}

//=======================================================================
//function : FindFace
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::FindFace(const TopoDS_Shape& S)
{
  myFace.Nullify();
  Standard_Boolean isavls = HasAvLS();
  Standard_Boolean isavs = (! myAvS.IsNull());
  TopExp_Explorer fex(S,TopAbs_FACE);
  for (; fex.More(); fex.Next()) {
    const TopoDS_Face& F = TopoDS::Face(fex.Current());
    Standard_Boolean toavoid = Standard_False;
    if ( isavls || isavs ) { 
      toavoid = toavoid || myMapAvS.Contains(F);
      if (!myAvS.IsNull()) toavoid = toavoid || F.IsSame(myAvS);
    }      
    if ( toavoid ) continue;
    myFace = F;
    break;
  }
}

//=======================================================================
//function : Perform
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::Perform()
{
  myState = TopAbs_UNKNOWN;
  if (myS.IsNull()) return;
  if (myRef.IsNull()) return;

  if (!mymredone) {
    MapRef();
  }

  if ( !myAvS.IsNull() ) {
    // tAvS = FACE,EDGE --> map(AvS,EDGE)
    // rejet des aretes de myAvS comme arete de classification
    // (le rejet simple de myAvS est insuffisant (connexite))
    myMapAvS.Clear();
    TopAbs_ShapeEnum tAvS = myAvS.ShapeType();
    if ( tAvS == TopAbs_FACE ) { 
      myMapAvS.Add(myAvS);
      TopExp::MapShapes(myAvS,TopAbs_EDGE,myMapAvS);
    }
    else if ( tAvS == TopAbs_EDGE ) {
      TopExp::MapShapes(myAvS,TopAbs_EDGE,myMapAvS);
    }
  }
  else if ( HasAvLS() ) {
    // tAvS = FACE,EDGE --> map(AvS,EDGE)
    // rejet des aretes de myPAvLS comme arete de classification
    // (le rejet simple de myPAvLS est insuffisant (connexite))
    myMapAvS.Clear();
    TopAbs_ShapeEnum tAvS = myPAvLS->First().ShapeType();
    if ( tAvS == TopAbs_FACE ) {
      TopTools_ListIteratorOfListOfShape it((*myPAvLS));
      for (; it.More(); it.Next() ) {
	const TopoDS_Shape& S = it.Value();
	myMapAvS.Add(S);
	TopExp::MapShapes(S,TopAbs_EDGE,myMapAvS);
      }
    }
    else if ( tAvS == TopAbs_EDGE ) {
      TopTools_ListIteratorOfListOfShape it((*myPAvLS));
      for (; it.More(); it.Next() ) {
	const TopoDS_Shape& S = it.Value();
	TopExp::MapShapes(S,TopAbs_EDGE,myMapAvS);
      }
    }
  }
  else {
    if ( myS.ShapeType() == TopAbs_FACE ) {
      myP3Ddef = BRepClass3d_SolidExplorer::FindAPointInTheFace
	(TopoDS::Face(myS),myP3D);
    }
  }

  TopAbs_ShapeEnum tS = myS.ShapeType();
  TopAbs_ShapeEnum tR = myRef.ShapeType();

  if ( tS == TopAbs_VERTEX ) {
    if ( tR <= TopAbs_SOLID ) {
      gp_Pnt P3D = BRep_Tool::Pnt(TopoDS::Vertex(myS));
      StateP3DReference(P3D);
    }
  }
  else if ( tS == TopAbs_EDGE ) {
    if ( tR == TopAbs_FACE || tR <= TopAbs_SOLID ) {
      FindEdge();
      StateEdgeReference();
    }
  }
  else if ( tS == TopAbs_WIRE ) {
    if ( tR == TopAbs_FACE || tR <= TopAbs_SOLID ) {
      FindEdge();
      StateEdgeReference();
    }
  }
  else if ( tS == TopAbs_FACE ) {
    if ( tR == TopAbs_FACE ) {
      FindEdge();
      if ( mySameDomain == 1 ) {
        StateEdgeReference();
      }
      else {
	if (!myP3Ddef) {
	  myP3Ddef = BRepClass3d_SolidExplorer::FindAPointInTheFace
	    (TopoDS::Face(myS),myP3D);
	}
	if (myP3Ddef) {
	  StateP3DReference(myP3D);
	}
	else {
	  myState = TopAbs_UNKNOWN;
	  Standard_ProgramError::Raise("TopOpeBRepTool_ShapeClassifier !P3Ddef");
	}
      }
    }
    else if ( tR <= TopAbs_SOLID ) {
      FindEdge();
      if (myP3Ddef) {
	StateP3DReference(myP3D);
      }
      else {
	StateEdgeReference();
      }
    }
  }
  else if ( tS == TopAbs_SHELL ) {
    if ( tR <= TopAbs_SOLID ) {
      FindEdge();
      StateEdgeReference();
    }
  }
  else if ( tS == TopAbs_SOLID ) {
    if ( tR <= TopAbs_SOLID ) {
      FindEdge();
      StateEdgeReference();
    }
  }
  else {
    Standard_ProgramError::Raise("StateShapeShape : bad operands");
  }
  
  // take orientation of reference shape in account
  TopAbs_Orientation oriRef = myRef.Orientation();
  if (oriRef == TopAbs_EXTERNAL || oriRef == TopAbs_INTERNAL ) {
    if (myState == TopAbs_IN) myState = TopAbs_OUT;
  }

}


//=======================================================================
//function : StateEdgeReference
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::StateEdgeReference()
{
  myState = TopAbs_UNKNOWN;

  if(myEdge.IsNull())
    return;
  if(myRef.IsNull())
    return;

  Handle(Geom_Curve) C3D;
  gp_Pnt P3D;
  Standard_Real f3d,l3d;

  Handle(Geom2d_Curve) C2D;
  gp_Pnt2d P2D;
  Standard_Real f2d,l2d,tol2d;
  
  TopAbs_ShapeEnum tR = myRef.ShapeType();
  // myEdge est une arete de myS, pas de myRef
  if( tR == TopAbs_FACE )
    {
      const TopoDS_Face& F = TopoDS::Face(myRef);
      if(mySameDomain)
	{
	  Standard_Boolean trimCurve = Standard_True;
	  C2D = FC2D_CurveOnSurface(myEdge,F,f2d,l2d,tol2d,trimCurve);

	  if(C2D.IsNull())
	    Standard_ProgramError::Raise("StateShapeShape : no 2d curve");

	  Standard_Real t = 0.127956477;
	  Standard_Real p = (1-t)*f2d + t*l2d;
	  P2D = C2D->Value(p);

#ifdef DEB
	  C3D = BRep_Tool::Curve(myEdge,f3d,l3d);
	  if(!C3D.IsNull())
	    P3D = C3D->Value(p);
#endif
	  StateP2DReference(P2D);
	  return;
	}
      else
	{ // myEdge/myRef=face en 3d
	  C3D = BRep_Tool::Curve(myEdge,f3d,l3d);

	  if(C3D.IsNull())
	    Standard_ProgramError::Raise("StateShapeShape : no 3d curve");

	  Standard_Real t = 0.127956477;
	  Standard_Real p = (1-t)*f3d + t*l3d;
	  P3D = C3D->Value(p);
	  StateP3DReference(P3D);
	  return;
	}
    }
  else if( tR <= TopAbs_SOLID )
    {
      Standard_Boolean degen = BRep_Tool::Degenerated(myEdge);
      if( degen )
	{
	  const TopoDS_Vertex& v = TopExp::FirstVertex(myEdge);
	  P3D = BRep_Tool::Pnt(v);
	  StateP3DReference(P3D);
	  return;
	}
      else
	{
	  C3D = BRep_Tool::Curve(myEdge,f3d,l3d);

	  if (C3D.IsNull())
	    Standard_ProgramError::Raise("StateShapeShape : no 3d curve");

	  Standard_Real t = 0.127956477;
	  Standard_Real p = (1-t)*f3d + t*l3d;
	  P3D = C3D->Value(p);
	  StateP3DReference(P3D);
	  return;
	}
    }
  else
    Standard_ProgramError::Raise("StateShapeShape : bad operands");
}


//=======================================================================
//function : StateP2DReference
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::StateP2DReference
(const gp_Pnt2d& P2D)
{
  myState = TopAbs_UNKNOWN;
  if (myRef.IsNull()) return;
  TopAbs_ShapeEnum tR = myRef.ShapeType();

  if ( tR == TopAbs_FACE ) {
    if (mymren == 1) {
      TopExp_Explorer x;
      for(x.Init(myRef,TopAbs_EDGE);x.More();x.Next()) {
//      for(TopExp_Explorer x(myRef,TopAbs_EDGE);x.More();x.Next()) {
	TopAbs_Orientation o = x.Current().Orientation();
//	if      (o == TopAbs_EXTERNAL) myState == TopAbs_OUT;
	if      (o == TopAbs_EXTERNAL) myState = TopAbs_OUT;
//	else if (o == TopAbs_INTERNAL) myState == TopAbs_IN;
	else if (o == TopAbs_INTERNAL) myState = TopAbs_IN;
	else {
#ifdef DEB
	  cout<<"StateP2DReference o<>E,I"<<endl;
#endif
	  break;
	}
      }
    }
    else {
      myP2D = P2D;
      myP2Ddef = Standard_True;
      TopoDS_Face F = TopoDS::Face(myRef);
      F.Orientation(TopAbs_FORWARD);
      Standard_Real  TolClass  = 1e-8;
      BRepTopAdaptor_FClass2d FClass2d(F,TolClass);
      myState = FClass2d.Perform(P2D);
    }
  }
  else {
    Standard_ProgramError::Raise("StateShapeShape : bad operands");
  }
}

//=======================================================================
//function : StateP3DReference
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::StateP3DReference(const gp_Pnt& P3D)
{
  myState = TopAbs_UNKNOWN;
  if (myRef.IsNull()) return;
  TopAbs_ShapeEnum tR = myRef.ShapeType();

  if ( tR == TopAbs_SOLID ) {
    myP3D = P3D;
    myP3Ddef = Standard_True;
    const TopoDS_Solid& SO = TopoDS::Solid(myRef);
    Standard_Real tol3d = Precision::Confusion();
    mySolidClassifier.Classify(SO,P3D,tol3d); 
    myState = mySolidClassifier.State();
  }
  else if ( tR < TopAbs_SOLID ) {
    myP3D = P3D;
    myP3Ddef = Standard_True;
    TopExp_Explorer ex;
    for (ex.Init(myRef,TopAbs_SOLID);ex.More();ex.Next()) {
//    for (TopExp_Explorer ex(myRef,TopAbs_SOLID);ex.More();ex.Next()) {
      const TopoDS_Solid& SO = TopoDS::Solid(ex.Current());
      Standard_Real tol3d = Precision::Confusion();
      mySolidClassifier.Classify(SO,P3D,tol3d); 
      myState = mySolidClassifier.State();
      if (myState == TopAbs_IN || myState == TopAbs_ON) {
	break;
      }
    }
  }
  else {
    Standard_ProgramError::Raise("StateShapeShape : bad operands");
  }
}

//=======================================================================
//function : State
//purpose  : 
//=======================================================================

TopAbs_State TopOpeBRepTool_ShapeClassifier::State() const
{
  return myState;
}

//=======================================================================
//function : P3D
//purpose  : 
//=======================================================================

const gp_Pnt& TopOpeBRepTool_ShapeClassifier::P3D() const
{
  if (myP3Ddef) { 
    return myP3D;
  }
  Standard_ProgramError::Raise("ShapeClassifier::P3D undefined");
  return myP3D;
}

//=======================================================================
//function : P2D
//purpose  : 
//=======================================================================

const gp_Pnt2d& TopOpeBRepTool_ShapeClassifier::P2D() const 
{
  if (myP2Ddef) {
    return myP2D;
  }
  Standard_ProgramError::Raise("ShapeClassifier::P2D undefined");
  return myP2D;
}

//=======================================================================
//function : HasAvLS
//purpose  : 
//=======================================================================

Standard_Boolean TopOpeBRepTool_ShapeClassifier::HasAvLS() const
{
  Standard_Boolean hasavls = (myPAvLS) ? (!myPAvLS->IsEmpty()) : Standard_False;
  return hasavls;
}

#if 0
//=======================================================================
//function : FindEdge
//purpose  : 
//=======================================================================

void TopOpeBRepTool_ShapeClassifier::FindEdge(const TopoDS_Shape& S)
{
  myEdge.Nullify();
  Standard_Boolean isavs = (! myAvS.IsNull());
  Standard_Boolean isavls = HasAvLS();
  Standard_Boolean isav = (isavs || isavls);

  if (S.IsNull()) return;
  TopAbs_ShapeEnum tS = S.ShapeType();

  TopExp_Explorer eex;
  if ( ! myFace.IsNull() ) eex.Init(myFace,TopAbs_EDGE);
  else eex.Init(S,TopAbs_EDGE);

  for(; eex.More(); eex.Next()) {
    const TopoDS_Edge& E = TopoDS::Edge(eex.Current());
    if ( isav ) {
      Standard_Boolean toavoid = Standard_False;
      if ( isavls ) toavoid = myMapAvS.Contains(E);
      else if ( isavs )	toavoid = E.IsSame(myAvS);      
      if ( toavoid ) continue;
    }
    else if ( BRep_Tool::Degenerated(E) ) {
      if ( tS != TopAbs_EDGE ) continue;
    }
    myEdge = E;
    break;
  }
}

static Standard_Boolean FindAPointInTheFace
(const TopoDS_Face& _face,gp_Pnt& APoint,Standard_Real& u,Standard_Real& v) 
{ 
  TopoDS_Face face=_face;
  face.Orientation(TopAbs_FORWARD);

  TopExp_Explorer     faceexplorer;
  BRepAdaptor_Curve2d c;
  gp_Vec2d T;
  gp_Pnt2d P;
  Standard_Boolean Ok = Standard_False;
  Standard_Integer nbiter=0;
  Standard_Real myParamOnEdge = 0.5;
  do { 
    nbiter++;
    if(myParamOnEdge==0.5)  myParamOnEdge = 0.4;
    else if(myParamOnEdge==0.4)  myParamOnEdge = 0.6; 
    else if(myParamOnEdge==0.6)  myParamOnEdge = 0.3; 
    else if(myParamOnEdge==0.3)  myParamOnEdge = 0.7; 
    else if(myParamOnEdge==0.7)  myParamOnEdge = 0.2; 
    else if(myParamOnEdge==0.2)  myParamOnEdge = 0.8; 
    else if(myParamOnEdge==0.8)  myParamOnEdge = 0.1; 
    else if(myParamOnEdge==0.1)  myParamOnEdge = 0.9;
    else { myParamOnEdge*=0.5; } 
    
    for (faceexplorer.Init(face,TopAbs_EDGE); 
	 faceexplorer.More(); 
	 faceexplorer.Next()) {
      TopoDS_Edge Edge = TopoDS::Edge(faceexplorer.Current());
      c.Initialize(Edge,face);
      Standard_Integer nbinterval = c.NbIntervals(GeomAbs_C1); 
      c.D1((c.LastParameter() - c.FirstParameter()) * myParamOnEdge + c.FirstParameter(),P,T);
      
      Standard_Real x=T.X();
      Standard_Real y=T.Y();
      //-- cout<<"Param:"<<(c.IntervalFirst() + c.IntervalLast()) * param<<" U:"<<P.X()<<" V:"<<P.Y();
      //-- cout<<" tguv x:"<<x<<" , y:"<<y<<endl;
      
      
      if(Edge.Orientation() == TopAbs_FORWARD) { 
	T.SetCoord(-y,x);
      }
      else { 
	T.SetCoord(y,-x);
      }
      
      Standard_Real ParamInit = RealLast();
      Standard_Real TolInit   = 0.00001;
      Standard_Boolean APointExist = Standard_False;
      
      BRepClass_FacePassiveClassifier FClassifier;
      
      T.Normalize();
      P.SetCoord(P.X()+TolInit*T.X(),P.Y()+TolInit*T.Y());
      FClassifier.Reset(gp_Lin2d(P,T),ParamInit,RealEpsilon());   //-- Longueur et Tolerance #######
      
      TopExp_Explorer otherfaceexplorer;
      for (otherfaceexplorer.Init(face,TopAbs_EDGE); 
	   otherfaceexplorer.More(); 
	   otherfaceexplorer.Next()) {
	TopoDS_Edge OtherEdge = TopoDS::Edge(otherfaceexplorer.Current());
	if((OtherEdge.Orientation() == TopAbs_EXTERNAL)) { 
	}
	else { 
	  BRepClass_Edge AEdge(OtherEdge,face);
	  FClassifier.Compare(AEdge,OtherEdge.Orientation());
	  if(FClassifier.ClosestIntersection()) { 
	    //-- cout<<" ---> Edge : "<<FClassifier.Parameter()<<endl;
	    if(ParamInit > FClassifier.Parameter()) { 
	      ParamInit = FClassifier.Parameter();
	      APointExist = Standard_True;
	    }
	  }
	}
      }
      if(APointExist) { 
	ParamInit*=0.5;
	u = P.X() + ParamInit* T.X();
	v = P.Y() + ParamInit* T.Y();
	BRepAdaptor_Surface  s;
	Standard_Boolean computerestriction = Standard_False;
	s.Initialize(face,computerestriction);
	s.D0(u,v,APoint);
	//-- cout<<" u="<<u<<" v="<<v<<"  -> ("<<APoint.X()<<","<<APoint.Y()<<","<<APoint.Z()<<endl;
	return(Standard_True);
      }
    }
  }
  while(nbiter<100);
  return(Standard_False);
}

#endif