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TopOpeBRepBuild_GridSS.cxx

// file:    TopOpeBRepBuild_GridSS.cxx
// Created: Thu Mar  7 10:49:33 1996
// Author:  Jean Yves LEBEY
//          <jyl@meteox>

#include <TopOpeBRepBuild_Builder.jxx>

#include <TopOpeBRepBuild_GTool.hxx>
#include <TopOpeBRepTool_ShapeExplorer.hxx>
#include <BRep_Tool.hxx>
#include <TopoDS.hxx>
#include <Geom2d_Curve.hxx>
#include <Standard_ProgramError.hxx>
#include <TopExp.hxx>
#include <TopOpeBRepTool_ShapeTool.hxx>
#include <TopOpeBRepDS_CurvePointInterference.hxx>
#include <GeomAdaptor_Surface.hxx>
#include <Geom_Surface.hxx>
#include <Geom_CylindricalSurface.hxx>
#include <Geom_TrimmedCurve.hxx>
#include <Geom2d_Curve.hxx>
#include <Geom2d_TrimmedCurve.hxx>
#include <Geom2d_Line.hxx>
#include <gp_Circ.hxx>
#include <gp_Dir2d.hxx>
#include <gp_Pnt2d.hxx>
#include <gp_Pnt.hxx>
#include <Precision.hxx>
#include <TopOpeBRepBuild_define.hxx>
#include <TopOpeBRepTool.hxx>
#include <TopOpeBRepTool_EXPORT.hxx>
#include <TopOpeBRepTool_2d.hxx>
#include <TopOpeBRepTool_CORRISO.hxx>
#include <TopOpeBRepTool_TOOL.hxx>
#include <TopOpeBRepDS.hxx>
#include <TopOpeBRepDS_EXPORT.hxx>
#include <TopOpeBRepDS_ProcessInterferencesTool.hxx>
#include <BRepAdaptor_Surface.hxx>
#include <TopOpeBRepBuild_Tools.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopOpeBRepDS_connex.hxx>
#include <gp_Lin2d.hxx>
#include <BRepClass_Intersector.hxx>
#include <BRepClass_Edge.hxx>
#include <IntRes2d_IntersectionPoint.hxx>
#include <IntRes2d_IntersectionSegment.hxx>
#include <ElCLib.hxx>
#include <BRepTools.hxx>
#include <GeomAPI_ProjectPointOnSurf.hxx>

#ifdef DRAW
#include <TopOpeBRepTool_DRAW.hxx>
#include <TopOpeBRepDS_DRAW.hxx>
#endif


#ifdef DEB
#define DEBSHASET(sarg,meth,shaset,str) TCollection_AsciiString sarg((meth));(sarg)=(sarg)+(shaset).DEBNumber()+(str);
Standard_EXPORT Standard_Boolean TopOpeBRepDS_GettraceSTRANGE();
Standard_EXPORT void debsplitf(const Standard_Integer i){cout<<"++ debsplitf "<<i<<endl;}
Standard_EXPORT void debspanc(const Standard_Integer i){cout<<"++ debspanc "<<i<<endl;}
Standard_EXPORT Standard_Integer GLOBAL_iexF = 0;
#endif

Standard_EXPORT Handle(Geom2d_Curve) BASISCURVE2D(const Handle(Geom2d_Curve)& C);
Standard_EXPORT void TopOpeBRepDS_SetThePCurve
(const BRep_Builder& B,TopoDS_Edge& E, const TopoDS_Face& F,const TopAbs_Orientation O,const Handle(Geom2d_Curve)& C);
//Standard_IMPORT Standard_Integer FUN_tool_outofUVbounds
//(const TopoDS_Face& fF,const TopoDS_Edge& E,Standard_Real& splitpar);

//---------------------------------------------
static Standard_Integer FUN_getG(const gp_Pnt P,const TopOpeBRepDS_ListOfInterference& LI,const Handle(TopOpeBRepDS_HDataStructure) HDS,Standard_Integer& iEinterf)
//---------------------------------------------
{
  TopOpeBRepDS_ListIteratorOfListOfInterference ILI(LI);
  Handle(TopOpeBRepDS_CurvePointInterference) SSI;  
  for (; ILI.More(); ILI.Next() ) {
    const Handle(TopOpeBRepDS_Interference)& I = ILI.Value();
    SSI = Handle(TopOpeBRepDS_CurvePointInterference)::DownCast(I);
    if (SSI.IsNull()) continue;
    Standard_Integer GI = SSI->Geometry();
    iEinterf = SSI->Support();
    const TopOpeBRepDS_Point& DSP = HDS->Point(GI);
    const gp_Pnt& P3d = DSP.Point();
    Standard_Real tolp = DSP.Tolerance();    
    Standard_Boolean sameP = P3d.IsEqual(P,tolp);
    if (sameP) return GI;
  } 
  return 0;
}

//----------------------------------------------------------------------      
// FUN_EPIforEvisoONperiodicF :
// Let <F> be a periodic face,
// <E> an edge with as pcurve on <F> a Viso line.
//
// if the pcurve of par u not bound in [0,2PI] : computes <CPI> interference on 
// <E> to split the edge at the point p2pi of u = 2PI; returns true.
// else                                        : returns false.
//
// To split the edge, scans among the list of edge point interferences
// <EPIL> in order to get a geometry point falling into geometry P2pi on 
// <F> of UV parameters = p2pi.
// Gets the new vertex of array <newV> attached to the geometry P2pi.
//----------------------------------------------------------------------      

#define SPLITEDGE      ( 0)
#define INCREASEPERIOD ( 1)
#define DECREASEPERIOD (-1)
      
static Standard_Boolean FUN_EPIforEvisoONperiodicF
(const TopoDS_Edge& E,const TopoDS_Face& F,const TopOpeBRepDS_ListOfInterference& EPIlist,const Handle(TopOpeBRepDS_HDataStructure) HDS,TopOpeBRepDS_ListOfInterference& loCPI)
{
  Standard_Real parone=-1.e7;   
  TopOpeBRepTool_CORRISO CORRISO(F); CORRISO.Init(F);
  Standard_Real uper; Standard_Boolean onU = CORRISO.Refclosed(1,uper); 
  Standard_Real tolF = BRep_Tool::Tolerance(F); Standard_Real tolu = CORRISO.Tol(1,tolF);
  Standard_Integer recadre = CORRISO.EdgeOUTofBoundsUV(E,onU,tolu,parone);
  //Standard_Integer recadre = FUN_tool_outofUVbounds(F,E,parone);
  if (recadre != SPLITEDGE) return Standard_False;

  gp_Pnt p3d; Standard_Boolean ok = FUN_tool_value(parone,E,p3d);
  if (!ok) return Standard_False; // nyi FUN_Raise
  Standard_Integer iEinterf=0; Standard_Integer iG = FUN_getG(p3d,EPIlist,HDS,iEinterf);
  if (iG == 0) {
#ifdef DEB
    Standard_Boolean strange = TopOpeBRepDS_GettraceSTRANGE();
    if (strange) cout<<"strange : FUN_EPIforEvisoONperiodicF"<<endl;
#endif
    return Standard_False;
  }
  if (HDS->Shape(iEinterf).ShapeType() != TopAbs_EDGE) iEinterf = 0;
//  else V2pi = TopoDS::Vertex(newV->Array1().Value(iG));
  
  // <CPI> :
  Standard_Integer iS = HDS->Shape(E);
  TopOpeBRepDS_Transition T(TopAbs_IN, TopAbs_IN, TopAbs_EDGE, TopAbs_EDGE); T.Index(iS);
  Handle(TopOpeBRepDS_CurvePointInterference) CPI = new TopOpeBRepDS_CurvePointInterference
      (T,TopOpeBRepDS_EDGE,iEinterf,TopOpeBRepDS_POINT,iG,parone); 
  loCPI.Append(CPI);
  return Standard_True;
} //FUN_EPIforEvisoONperiodicF

//----------------------------------------------------------------------
// FUN_GetSplitsON :
// <F> is a periodic face, <E> has for pcurve on <F> a visoline
// of par u not bound in [0,2PI]. 
// Splits the edge at <paronE> (UV point for <paronE> has its u=2PI)
// Recompute the pcurve for the split with (parameter on edge >= <paronE>)
//----------------------------------------------------------------------
/*static void FUN_GetSplitsON
(const TopoDS_Edge& E, TopoDS_Vertex& V2pi, const Standard_Real& paronE,const TopoDS_Face& F, TopTools_ListOfShape& losplits)
{
  Standard_Real pf,pl,tolpc;  
  TopoDS_Vertex Vf, Vl; TopExp::Vertices(E,Vf,Vl);
  Handle(Geom2d_Curve) PC = FC2D_CurveOnSurface(E,F,pf,pl,tolpc);
  const Handle(Geom_Surface)& S = BRep_Tool::Surface(F);
  Standard_Real tole = BRep_Tool::Tolerance(E);
  TopOpeBRepDS_BuildTool BT; BRep_Builder BB;
  
  TopAbs_Orientation oriVinf, oriVsup, oriE = E.Orientation();
  oriVinf = (oriE == TopAbs_FORWARD)? TopAbs_FORWARD: TopAbs_REVERSED;
  oriVsup = (oriE == TopAbs_FORWARD)? TopAbs_REVERSED: TopAbs_FORWARD;
  
  // Einf2pi :
  TopoDS_Edge Einf2pi; BT.CopyEdge(E,Einf2pi);
  Vf.Orientation(oriVinf);   BB.Add(Einf2pi,Vf);   BT.Parameter(Einf2pi,Vf,pf);
  V2pi.Orientation(oriVsup); BB.Add(Einf2pi,V2pi); BT.Parameter(Einf2pi,V2pi,paronE);
  
  // Esup2pi :  
  TopoDS_Edge Esup2pi; BT.CopyEdge(E,Esup2pi);
  V2pi.Orientation(oriVinf); BB.Add(Esup2pi,V2pi); BT.Parameter(Esup2pi,V2pi,paronE);
  Vl.Orientation(oriVsup);   BB.Add(Esup2pi,Vl);   BT.Parameter(Esup2pi,Vl,pl);
  gp_Pnt2d tmp = PC->Value(pf); Standard_Real v = tmp.Y();
  Handle(Geom2d_Line) L2d = 
    new Geom2d_Line(gp_Pnt2d(-paronE,v),gp_Dir2d(1.,0.));
  Handle(Geom2d_TrimmedCurve) PCsup2pi = new Geom2d_TrimmedCurve(L2d,paronE,pl); 
  TopOpeBRepDS_SetThePCurve(BB,Esup2pi,F,oriE,PCsup2pi);
  
#ifdef DEB
  Standard_Boolean trc = Standard_False;
#ifdef DRAW
  if (trc) {TCollection_AsciiString aa("PCinf");FUN_tool_draw(aa,Einf2pi,F,0);}
  if (trc) {TCollection_AsciiString aa("PCsup");FUN_tool_draw(aa,Esup2pi,F,0);} 
#endif
#endif
  losplits.Append(Einf2pi); losplits.Append(Esup2pi);
}*/

//---------------------------------------------
static void FUN_getEPI(const TopOpeBRepDS_ListOfInterference& LI,TopOpeBRepDS_ListOfInterference& EPI)
//---------------------------------------------
{
  TopOpeBRepDS_ListIteratorOfListOfInterference ILI(LI);
  Handle(TopOpeBRepDS_CurvePointInterference) CPI;  
  for (; ILI.More(); ILI.Next() ) {
    const Handle(TopOpeBRepDS_Interference)& I = ILI.Value();
    CPI = Handle(TopOpeBRepDS_CurvePointInterference)::DownCast(I);
    if (CPI.IsNull()) continue;
    TopOpeBRepDS_Kind GT,ST;Standard_Integer GI,SI;FDS_data(CPI,GT,GI,ST,SI);
    if (GT != TopOpeBRepDS_POINT || ST != TopOpeBRepDS_FACE)  continue;
    EPI.Append(I);
  }
}

//---------------------------------------------
static void FUN_getEPIonEds(const TopoDS_Shape& FOR,const Handle(TopOpeBRepDS_HDataStructure)& HDS,TopOpeBRepDS_ListOfInterference& EPI)
//---------------------------------------------
{
  TopExp_Explorer ex(FOR, TopAbs_EDGE);
  for (; ex.More(); ex.Next()) {
    const TopoDS_Shape& E = ex.Current();
    if (HDS->HasShape(E)) {
      const TopOpeBRepDS_ListOfInterference& LII = HDS->DS().ShapeInterferences(E);
      FUN_getEPI(LII,EPI);      
    }
  }
}

//=======================================================================
//function : GMergeSolids
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GMergeSolids(const TopTools_ListOfShape& LSO1,const TopTools_ListOfShape& LSO2,const TopOpeBRepBuild_GTopo& G1)
{
  if ( LSO1.IsEmpty() ) return;
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  
  const TopoDS_Shape& SO1 = LSO1.First();
#ifdef DEB
  Standard_Integer iSO; Standard_Boolean tSPS = GtraceSPS(SO1,iSO);
  if(tSPS){
    cout<<endl;
    cout<<"--- GMergeSolids "<<endl;
    GdumpSAMDOM(LSO1, (char *) "1 : ");
    GdumpSAMDOM(LSO2, (char *) "2 : ");
  }
#endif
  
  mySolidReference = TopoDS::Solid(SO1);
  TopOpeBRepBuild_ShellFaceSet SFS(SO1,this);
  GFillSolidsSFS(LSO1,LSO2,G1,SFS);
  
  // Create a solid builder SOBU
  TopoDS_Shape SO1F = LSO1.First(); SO1F.Orientation(TopAbs_FORWARD);
  TopOpeBRepBuild_SolidBuilder SOBU;
  Standard_Boolean ForceClassSOBU = Standard_True;
  SOBU.InitSolidBuilder(SFS,ForceClassSOBU);
  
  // Build new solids LSOM
  TopTools_ListOfShape LSOM;
  GSOBUMakeSolids(SO1F,SOBU,LSOM);
  
  // connect new solids as solids built TB1 on LSO1 solids
  TopTools_ListIteratorOfListOfShape it1;
  for (it1.Initialize(LSO1); it1.More(); it1.Next()) {
    const TopoDS_Shape& aSO1 = it1.Value();
    Standard_Boolean ismerged = IsMerged(aSO1,TB1);
    if (ismerged) continue;
    TopTools_ListOfShape& SOL = ChangeMerged(aSO1,TB1);
    SOL = LSOM;
  }
  
  // connect new solids as solids built TB2 on LSO2 solids
  TopTools_ListIteratorOfListOfShape it2;
  for (it2.Initialize(LSO2); it2.More(); it2.Next()) {
    const TopoDS_Shape& SO2 = it2.Value();
    Standard_Boolean ismerged = IsMerged(SO2,TB2);
    if (ismerged) continue;
    TopTools_ListOfShape& SOL = ChangeMerged(SO2,TB2);
    SOL = LSOM;
  }
  
} // GMergeSolids

//=======================================================================
//function : GFillSolidsSFS
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GFillSolidsSFS(const TopTools_ListOfShape& LS1,const TopTools_ListOfShape& LS2,const TopOpeBRepBuild_GTopo& G1,TopOpeBRepBuild_ShellFaceSet& SFS)
{

  if ( LS1.IsEmpty() ) return;
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  myProcessON = (Opecom() || Opefus());
  if (myProcessON) {
    myONFacesMap.Clear();
  }
  
  mySolidReference = TopoDS::Solid(LS1.First());
  
  TopAbs_State TB;
  TopOpeBRepBuild_GTopo G;
  TopTools_ListIteratorOfListOfShape it;
  
  G = G1;
  TB = TB1; it.Initialize(LS1);
  for(; it.More(); it.Next()) {
    const TopoDS_Shape& S = it.Value();
    Standard_Boolean tomerge = !IsMerged(S,TB);
#ifdef DEB
    Standard_Integer iS; Standard_Boolean tSPS = GtraceSPS(S,iS);
    if(tSPS){
      cout<<endl;
      GdumpSHASTA(S,TB,"--- GFillSolidsSFS "); cout<<" tomerge : "<<tomerge<<endl;
    }
#endif
    if (tomerge) GFillSolidSFS(S,LS2,G,SFS);
  }
  
  G = G1.CopyPermuted();
  TB = TB2;
  it.Initialize(LS2);
  for (; it.More(); it.Next()) {
    const TopoDS_Shape& S = it.Value();
    Standard_Boolean tomerge = !IsMerged(S,TB);
#ifdef DEB
    Standard_Integer iS; Standard_Boolean tSPS = GtraceSPS(S,iS);
    if(tSPS){
      cout<<endl;
      GdumpSHASTA(S,TB,"--- GFillSolidsSFS "); cout<<" tomerge : "<<tomerge<<endl;
    }
#endif
    if (tomerge) GFillSolidSFS(S,LS1,G,SFS);
  }

  if (myProcessON) {
    AddONPatchesSFS(G1, SFS);
    myProcessON = Standard_False;
  }

} // GFillSolidsSFS

//=======================================================================
//function : GFillSolidSFS
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GFillSolidSFS(const TopoDS_Shape& SO1,const TopTools_ListOfShape& LSO2,const TopOpeBRepBuild_GTopo& G1,TopOpeBRepBuild_ShellFaceSet& SFS)
{
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  Standard_Boolean RevOri1 = G1.IsToReverse1();
  
#ifdef DEB
  Standard_Integer iSO; Standard_Boolean tSPS = GtraceSPS(SO1,iSO);
  if(tSPS){
    cout<<endl;
    GdumpSHASTA(SO1,TB1,"--- GFillSolidSFS ");cout<<endl;
  }
#endif
  
  // work on a FORWARD solid SOF
  TopoDS_Shape SOF = SO1; SOF.Orientation(TopAbs_FORWARD);
  mySolidToFill = TopoDS::Solid(SOF);
  
  TopOpeBRepTool_ShapeExplorer exShell(SOF,TopAbs_SHELL);
  for (; exShell.More(); exShell.Next()) {
    TopoDS_Shape SH = exShell.Current();
    Standard_Boolean hasshape = myDataStructure->HasShape(SH);
    
    if ( ! hasshape ) {
      // shell SH is not in DS : classify it with LSO2 solids
      Standard_Boolean keep = GKeepShape(SH,LSO2,TB1);
      if (keep) {
      TopAbs_Orientation oriSH = SH.Orientation();
      TopAbs_Orientation neworiSH = Orient(oriSH,RevOri1);
      SH.Orientation(neworiSH);

#ifdef DEB
      if(tSPS){
      DEBSHASET(ss,"--- GFillSolidSFS ",SFS," AddShape SFS+ shell ");  
      GdumpSHA(SH,(Standard_Address)ss.ToCString());
      cout<<" ";TopAbs::Print(TB1,cout)<<" : 1 shell ";
      TopAbs::Print(neworiSH,cout); cout<<endl;
      }
#endif

      SFS.AddShape(SH);
      }
    }
    else { // shell SH has faces(s) with geometry : split SH faces
      GFillShellSFS(SH,LSO2,G1,SFS);
    }
  }
  
} // GFillSolidSFS

//=======================================================================
//function : GFillSurfaceTopologySFS
//purpose  : 
//=======================================================================
#ifdef DEB
void TopOpeBRepBuild_Builder::GFillSurfaceTopologySFS(const TopoDS_Shape& SO1,
#else
void TopOpeBRepBuild_Builder::GFillSurfaceTopologySFS(const TopoDS_Shape&,
#endif
                                                      const TopOpeBRepBuild_GTopo& G1,
                                                      TopOpeBRepBuild_ShellFaceSet& /*SFS*/)
{
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  TopAbs_ShapeEnum t1,t2,ShapeInterf;
  G1.Type(t1,t2); ShapeInterf = t1;
  
#ifdef DEB
  Standard_Integer iSO; Standard_Boolean tSPS = GtraceSPS(SO1,iSO);
  if(tSPS){
    cout<<endl;
    cout<<"--- GFillSurfaceTopologySFS ShapeInterf ";TopAbs::Print(ShapeInterf,cout);
    cout<<endl;
  }
  cout<<"GFillSurfaceTopologySFS : NYI"<<endl;
#endif
  
} // GFillSurfaceTopologySFS

//=======================================================================
//function : GFillSurfaceTopologySFS
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GFillSurfaceTopologySFS
  (const TopOpeBRepDS_SurfaceIterator& SSit,
   const TopOpeBRepBuild_GTopo& G1,
   TopOpeBRepBuild_ShellFaceSet& SFS) const 
{
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  TopOpeBRepDS_Config Conf = G1.Config1();
  TopAbs_State TB = TB1;
  if ( Conf == TopOpeBRepDS_DIFFORIENTED ) {
    if      (TB1 == TopAbs_OUT) TB = TopAbs_IN;
    else if (TB1 == TopAbs_IN ) TB = TopAbs_OUT;
  }
  
#ifdef DEB
  Standard_Integer iSO; Standard_Boolean tSPS = GtraceSPS(SFS.Solid(),iSO);
  Standard_Integer iref = myDataStructure->Shape(mySolidReference);
  Standard_Integer ifil = myDataStructure->Shape(mySolidToFill);
  if(tSPS){
    cout<<"ifil : "<<ifil<<" iref : "<<iref<<endl;
    cout<<"solid "<<ifil<<" is ";TopOpeBRepDS::Print(Conf,cout);
    cout<<endl;
  }
#endif
  
  // iG = index of new surface // NYI or existing face
  Standard_Integer iG = SSit.Current();
  const TopTools_ListOfShape& LnewF = NewFaces(iG);
  TopTools_ListIteratorOfListOfShape Iti(LnewF);
  for (; Iti.More(); Iti.Next()) {
    TopoDS_Shape F = Iti.Value();
    TopAbs_Orientation ori = SSit.Orientation(TB);
    F.Orientation(ori);

#ifdef DEB
    if (tSPS){
      DEBSHASET(ss,"--- GFillSurfaceTopologySFS ",SFS," AddElement SFS+ face ");  
      GdumpSHA(F,(Standard_Address)ss.ToCString());
      cout<<" ";TopAbs::Print(TB,cout)<<" : 1 face ";
      TopAbs::Print(ori,cout); cout<<endl;
    }
#endif

    SFS.AddElement(F);
  } // iterate on new faces built on surface <iG>
  
} // GFillSurfaceTopologySFS

//=======================================================================
//function : GFillShellSFS
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GFillShellSFS(const TopoDS_Shape& SH,
                                            const TopTools_ListOfShape& LSO2,
                                            const TopOpeBRepBuild_GTopo& G1,
                                            TopOpeBRepBuild_ShellFaceSet& SFS)
{  
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);

#ifdef DEB
  Standard_Integer ish; Standard_Boolean tSPS = GtraceSPS(SH,ish);
  if(tSPS){
      cout<<endl;
      GdumpSHA(SH, (char *) "--- GFillShellSFS ");
      cout<<endl;}
#endif
  
  Standard_Integer nlsfs = SFS.ChangeStartShapes().Extent();
  TopOpeBRepTool_ShapeExplorer exFace;
  Standard_Integer ifor = 0;
  
  // 1/ : toutes les faces HasSameDomain
  for (exFace.Init(SH,TopAbs_FACE); exFace.More(); exFace.Next()) {
    nlsfs = SFS.ChangeStartShapes().Extent();
    const TopoDS_Shape& FOR = exFace.Current();
    ifor = myDataStructure->Shape(FOR);
    Standard_Boolean hsd = myDataStructure->HasSameDomain(FOR);
    if ( hsd ) {
      GFillFaceSFS(FOR,LSO2,G1,SFS);
    } // hsd
    nlsfs = SFS.ChangeStartShapes().Extent();
  } // exFace.More()
  
#ifdef DEB
  if (tSPS) {
    SFS.DumpSS();
  }
#endif
  
  // 2/ : toutes les faces non HasSameDomain
  for (exFace.Init(SH,TopAbs_FACE); exFace.More(); exFace.Next()) {
    nlsfs = SFS.ChangeStartShapes().Extent();
    const TopoDS_Shape& FOR = exFace.Current();
    ifor = myDataStructure->Shape(FOR);
    Standard_Boolean hsd = myDataStructure->HasSameDomain(FOR);
    if ( !hsd ) {
      GFillFaceSFS(FOR,LSO2,G1,SFS);
    } // hsd
    nlsfs = SFS.ChangeStartShapes().Extent();
  }
  
} // GFillShellSFS

// ----------------------------------------------------------------------
static void FUNBUILD_MAPSUBSHAPES(const TopoDS_Shape& S,
                                  const TopAbs_ShapeEnum T,
                                  TopTools_IndexedMapOfShape& _IM)
{
 TopExp::MapShapes(S,T,_IM);
}

// ----------------------------------------------------------------------
static void FUNBUILD_MAPSUBSHAPES(const TopTools_ListOfShape& LOFS,
                                  const TopAbs_ShapeEnum T,TopTools_IndexedMapOfShape& _IM)
{
 for (TopTools_ListIteratorOfListOfShape it(LOFS);it.More();it.Next())
   FUNBUILD_MAPSUBSHAPES(it.Value(),T,_IM);
}

// ----------------------------------------------------------------------
static void FUNBUILD_MAPANCSPLSHAPES(TopOpeBRepBuild_Builder& B,
                                     const TopoDS_Shape& S,
                                     const TopAbs_State STATE,
                                     TopTools_IndexedDataMapOfShapeListOfShape& _IDM)
{
  Standard_Boolean issp = B.IsSplit(S,STATE);
  if (issp) {
    const TopTools_ListOfShape& l = B.Splits(S,STATE);
    for (TopTools_ListIteratorOfListOfShape it(l);it.More();it.Next()) {
      const TopoDS_Shape& sps = it.Value(); // sps = split result of S on state STATE
      TopTools_ListOfShape thelist;
      if ( ! _IDM.Contains(sps) ) _IDM.Add(sps, thelist);
      _IDM.ChangeFromKey(sps).Append(S);
    }
  }
}

// ----------------------------------------------------------------------
static void FUNBUILD_MAPANCSPLSHAPES(TopOpeBRepBuild_Builder& B,
                                     const TopoDS_Shape& S,
                                     TopTools_IndexedDataMapOfShapeListOfShape& _IDM)
{
  FUNBUILD_MAPANCSPLSHAPES(B,S,TopAbs_IN, _IDM);
  FUNBUILD_MAPANCSPLSHAPES(B,S,TopAbs_OUT,_IDM);
}

// ----------------------------------------------------------------------
static void FUNBUILD_MAPANCSPLSHAPES(TopOpeBRepBuild_Builder& B,
                                     const TopTools_IndexedMapOfShape& M,
                                     TopTools_IndexedDataMapOfShapeListOfShape& _IDM)
{
  Standard_Integer n = M.Extent();
  for(Standard_Integer i = 1;i <= n;i++) FUNBUILD_MAPANCSPLSHAPES(B,M(i),_IDM);
}

static TopTools_IndexedMapOfShape stabuild_IMELF1;
static TopTools_IndexedMapOfShape stabuild_IMELF2;
static TopTools_IndexedDataMapOfShapeListOfShape stabuild_IDMEALF1;
static TopTools_IndexedDataMapOfShapeListOfShape stabuild_IDMEALF2;
static TopOpeBRepDS_Config static_CONF1;
static TopOpeBRepDS_Config static_CONF2;
// ----------------------------------------------------------------------
Standard_EXPORT void FUNBUILD_ANCESTORRANKPREPARE(TopOpeBRepBuild_Builder& B,
                                                  const TopTools_ListOfShape& LF1,
                                                  const TopTools_ListOfShape& LF2,
                                                  const TopOpeBRepDS_Config CONF1,
                                                  const TopOpeBRepDS_Config CONF2)
{
  static_CONF1 = CONF1;
  static_CONF2 = CONF2;
  FUNBUILD_MAPSUBSHAPES(LF1,TopAbs_EDGE,stabuild_IMELF1);
  FUNBUILD_MAPSUBSHAPES(LF2,TopAbs_EDGE,stabuild_IMELF2);
  FUNBUILD_MAPANCSPLSHAPES(B,stabuild_IMELF1,stabuild_IDMEALF1);
  FUNBUILD_MAPANCSPLSHAPES(B,stabuild_IMELF2,stabuild_IDMEALF2);
}

static TopTools_IndexedMapOfShape stabuild_IMEF;
// ----------------------------------------------------------------------
Standard_EXPORT void FUNBUILD_ANCESTORRANKGET(TopOpeBRepBuild_Builder& /*B*/,
                                              const TopoDS_Shape& f,
                                              Standard_Boolean& of1,
                                              Standard_Boolean& of2)
{
  FUNBUILD_MAPSUBSHAPES(f,TopAbs_EDGE,stabuild_IMEF);
  Standard_Integer ief = 1,nef = stabuild_IMEF.Extent();
  of1 = Standard_False;
  for (ief = 1; ief <= nef; ief++ ) {
    const TopoDS_Shape& e = stabuild_IMEF(ief); of1 = stabuild_IDMEALF1.Contains(e);
    if (of1) break;
  } 
  of2 = Standard_False;
  for (ief = 1; ief <= nef; ief++ ) {
    const TopoDS_Shape& e = stabuild_IMEF(ief); of2 = stabuild_IDMEALF2.Contains(e);
    if (of2) break;
  }
}

// ----------------------------------------------------------------------
Standard_EXPORT void FUNBUILD_ORIENTLOFS(TopOpeBRepBuild_Builder& B,
                                         const TopAbs_State TB1,
                                         const TopAbs_State TB2,
                                         TopTools_ListOfShape& LOFS)
{
  for (TopTools_ListIteratorOfListOfShape it(LOFS);it.More();it.Next()) {
    TopoDS_Shape& f = it.Value();
    Standard_Boolean of1,of2; FUNBUILD_ANCESTORRANKGET(B,f,of1,of2);
    TopAbs_Orientation orif = f.Orientation();
    Standard_Boolean r12 = B.Reverse(TB1,TB2); Standard_Boolean r21 = B.Reverse(TB2,TB1);
    Standard_Boolean rf = Standard_False;
    if      (of1 && !of2) rf = r12;
    else if (of2 && !of1) rf = r21;
    TopAbs_Orientation neworif = B.Orient(orif,rf);
    f.Orientation(neworif);
  }
}

Standard_EXPORT Standard_Boolean GLOBAL_revownsplfacori = Standard_False;
// GLOBAL_REVerseOWNSPLittedFACeORIentation = True : dans GSplitFaceSFS on 
// applique le retournement d'orientation de la face splittee FS de F 
// a l'orientation de FS elle-meme (au lieu de l'appliquer a l'orientation 
// de la face F comme en standard)

//Standard_IMPORT extern TopTools_DataMapOfShapeInteger* GLOBAL_SplitAnc; //xpu260598
Standard_EXPORTEXTERN TopTools_DataMapOfShapeInteger* GLOBAL_SplitAnc; //xpu260598
//static TopAbs_Orientation FUN_intTOori(const Standard_Integer Iori) 
//{
//  if (Iori == 1)  return TopAbs_FORWARD;
//  if (Iori == 2)  return TopAbs_REVERSED;
//  if (Iori == 11) return TopAbs_INTERNAL;
//  if (Iori == 22) return TopAbs_EXTERNAL;
//  return TopAbs_EXTERNAL;
//}

//Standard_IMPORT extern TopTools_ListOfShape* GLOBAL_lfr1;
Standard_EXPORTEXTERN TopTools_ListOfShape* GLOBAL_lfr1;
//Standard_IMPORT extern Standard_Boolean GLOBAL_lfrtoprocess;
Standard_EXPORTEXTERN Standard_Boolean GLOBAL_lfrtoprocess;

//=======================================================================
//function : GSplitFaceSFS
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GSplitFaceSFS
(const TopoDS_Shape& FOR,const TopTools_ListOfShape& LSclass,const TopOpeBRepBuild_GTopo& G1,
 TopOpeBRepBuild_ShellFaceSet& SFS)
{
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  Standard_Boolean RevOri1 = G1.IsToReverse1();
  TopAbs_Orientation oriF = FOR.Orientation();
  TopAbs_Orientation neworiF = Orient(oriF,RevOri1);
  const TopOpeBRepDS_DataStructure& BDS = myDataStructure->DS();
#ifdef DEB
  Standard_Integer iFOR =
#endif  
             BDS.Shape(FOR);
  
#ifdef DEB
  Standard_Integer iiFOR; Standard_Boolean tSPS = GtraceSPS(FOR,iiFOR);
  if(tSPS){
    cout<<endl;
    GdumpSHASTA(FOR,TB1,"--- GSplitFaceSFS ");cout<<" RevOri1 : "<<RevOri1<<endl;debsplitf(iFOR);
  }
#endif  
  
  Standard_Boolean issplit = IsSplit(FOR,TB1);
  if ( issplit ) {

  // LOFS faces all have the same topological orientation.
  // according to edge origin and operation performed, orientate them.
  // NYI CDLize MapEdgeAncestors or modify WES in such a way
  // that it memorizes edge ancestors of added elements.

    TopTools_ListOfShape& LSF = ChangeSplit(FOR,TB1);
    if ( GLOBAL_revownsplfacori ) {
      FUNBUILD_ORIENTLOFS(*this,TB1,TB2,LSF);
    }
    for (TopTools_ListIteratorOfListOfShape it(LSF); it.More(); it.Next()) {
      TopoDS_Shape newF = it.Value(); 
      
      if (GLOBAL_SplitAnc != NULL) {
      Standard_Boolean hasoridef = GLOBAL_SplitAnc->IsBound(newF); //xpu260598
      
      Standard_Boolean opeFus = Opefus();
      Standard_Boolean opec12 = Opec12();
      Standard_Boolean opec21 = Opec21();
      Standard_Boolean opeCut = opec12 || opec21;
      Standard_Boolean opeCom = Opecom();
      
      if (hasoridef) {
        Standard_Integer iAnc = GLOBAL_SplitAnc->Find(newF); 

        Standard_Integer rkAnc = BDS.AncestorRank(iAnc);
        TopAbs_Orientation oAnc = BDS.Shape(iAnc).Orientation(); 
#ifdef DEB
        Standard_Integer iFanc; Standard_Boolean tSPSa = GtraceSPS(BDS.Shape(iAnc),iFanc);
        if (tSPSa) debspanc(iAnc);
#endif        
        if      (opeCom) {
          // xpu260598 : orifspIN = orifanc 
          //  bcl1;bcl2 tspIN(f23) is splitIN(f23), f9 SDDO f23   
          neworiF = oAnc;
        }
        else if (opeCut) {
          // xpu280598 : cto100G1 spIN(f21)
          TopAbs_State TBAnc = TopAbs_UNKNOWN; 
          if (opec12) TBAnc = (rkAnc == 1)? TopAbs_OUT : TopAbs_IN;
          if (opec21) TBAnc = (rkAnc == 2)? TopAbs_OUT : TopAbs_IN;
          
          // if TBAnc == OUT : we keep orientation
          // else              we reverse it
          if (TBAnc == TopAbs_OUT) neworiF = oAnc;
          else                     neworiF = TopAbs::Complement(oAnc);
        }
        else if (opeFus) {
          neworiF = oAnc; //xpu290598         
        }

        Standard_Boolean reverse = Standard_False;
        Standard_Integer irefAnc = BDS.SameDomainRef(iAnc);
        if (irefAnc != iAnc) { // newFace is built on geometry of refAnc
          Standard_Boolean samegeom=Standard_False;
          TopOpeBRepDS_Config cAnc = BDS.SameDomainOri(iAnc);
          if      (cAnc == TopOpeBRepDS_SAMEORIENTED) samegeom = Standard_True;
          else if (cAnc == TopOpeBRepDS_DIFFORIENTED) samegeom = Standard_False;
          TopAbs_Orientation orefAnc = BDS.Shape(irefAnc).Orientation();
          if (oAnc != orefAnc) samegeom = !samegeom;
          reverse = !samegeom;
        }
        if (reverse) neworiF = TopAbs::Complement(neworiF);

      } // hasoridef
      } 
      
      newF.Orientation(neworiF);

      if (GLOBAL_lfrtoprocess) {
      GLOBAL_lfr1->Append(newF);
      }
      else {
#ifdef DEB
      if(tSPS){
        DEBSHASET(ss,"--- GSplitFaceSFS ",SFS," AddStartElement SFS+ face ");  
        GdumpSHA(newF,(Standard_Address)ss.ToCString());
        cout<<" ";TopAbs::Print(TB1,cout)<<" : 1 face ";
        TopAbs::Print(neworiF,cout); cout<<endl;
      }
#endif
      
      SFS.AddStartElement(newF);
      }
    }    
  }
  else {
    // FOR n'a pas de devenir de Split par TB1
    // on garde FOR si elle est situee TB1 / LSclass
    Standard_Boolean add = Standard_True;
    
    Standard_Boolean hs = myDataStructure->HasShape(FOR);
    Standard_Boolean hg = myDataStructure->HasGeometry(FOR);
    Standard_Boolean testkeep = Standard_True;
    testkeep = (hs && (!hg)); // +12/05 macktruck
    
    if (testkeep) { 
      Standard_Boolean keep = GKeepShape(FOR,LSclass,TB1);
      add = keep;
    }
    if (add) {
      TopoDS_Shape F = FOR;
      F.Orientation(neworiF);

#ifdef DEB
      if(tSPS){
      DEBSHASET(ss,"--- GSplitFaceSFS ",SFS," AddElement SFS+ face ");  
      GdumpSHA(F,(Standard_Address)ss.ToCString());
      cout<<" ";TopAbs::Print(TB1,cout)<<" : 1 face ";
      TopAbs::Print(neworiF,cout); cout<<endl;
      }
#endif

      SFS.AddElement(F);
    }
  }
  
} // GSplitFaceSFS

//=======================================================================
//function : GMergeFaceSFS
//purpose  : (methode non utilisee)
//=======================================================================
void TopOpeBRepBuild_Builder::GMergeFaceSFS
(const TopoDS_Shape& FOR,const TopOpeBRepBuild_GTopo& G1,
 TopOpeBRepBuild_ShellFaceSet& SFS)
{  
#ifdef DEB
  Standard_Integer iFOR; Standard_Boolean tSPS = GtraceSPS(FOR,iFOR);
  if(tSPS){
    cout<<endl;
    GdumpSHA(FOR, (char *) "--- GMergeFaceSFS ");
    cout<<endl;
  }
#endif
  
  Standard_Boolean tomerge = GToMerge(FOR);
  if (!tomerge) return;
  
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  Standard_Boolean RevOri1 = G1.IsToReverse1();
  
  TopAbs_Orientation oriF = FOR.Orientation();
  TopAbs_Orientation neworiF = Orient(oriF,RevOri1);
  
  TopoDS_Shape FF = FOR; FF.Orientation(TopAbs_FORWARD);
  
  Standard_Boolean makecomsam = GTakeCommonOfSame(G1);
  Standard_Boolean makecomdif = GTakeCommonOfDiff(G1);
  if ( !makecomsam && !makecomdif) return;
  
  //LFSO,LFDO (samedom,sameori),(samedom,diffori) des 2 shapes peres
  //LFSO1,LFDO1 (samedom,sameori),(samedom,diffori) du shape pere de F
  //LFSO2,LFDO2 (samedom,sameori),(samedom,diffori) du shape != pere de F
  TopTools_ListOfShape LFSO,LFDO,LFSO1,LFDO1,LFSO2,LFDO2;
  GFindSamDomSODO(FF,LFSO,LFDO);
  Standard_Integer rankF=GShapeRank(FF),rankX=(rankF)?((rankF==1)?2:1):0;
  GFindSameRank(LFSO,rankF,LFSO1); GFindSameRank(LFDO,rankF,LFDO1);
  GFindSameRank(LFSO,rankX,LFSO2); GFindSameRank(LFDO,rankX,LFDO2);
  
#ifdef DEB
  if(tSPS){
    cout<<"--------- merge FACE "<<iFOR<<endl;
    GdumpSAMDOM(LFSO1, (char *) "LFSO1 : "); 
    GdumpSAMDOM(LFDO1, (char *) "LFDO1 : ");
    GdumpSAMDOM(LFSO2, (char *) "LFSO2 : "); 
    GdumpSAMDOM(LFDO2, (char *) "LFDO2 : ");
  }
#endif
  
  Standard_Boolean performcom = Standard_False;
  TopTools_ListOfShape *PtrLF1=NULL,*PtrLF2=NULL;
  Standard_Integer n1=0,n2=0;
  if      (makecomsam) { 
    n1 = LFSO1.Extent(); n2 = LFSO2.Extent();
    performcom = ( n1 != 0 && n2 != 0 );
    if (performcom) { PtrLF1 = &LFSO1; PtrLF2 = &LFSO2; }
  }
  else if (makecomdif) { 
    n1 = LFSO1.Extent(); n2 = LFDO2.Extent();
    performcom = ( n1 != 0 && n2 != 0 );
    if (performcom) { PtrLF1 = &LFSO1; PtrLF2 = &LFDO2; }
  }
  
#ifdef DEB
  if(tSPS) {
    cout<<"performcom : "<<performcom<<" ";
    cout<<"makecomsam : "<<makecomsam<<" makcomdif : "<<makecomdif<<" ";
    cout<<"n1 : "<<n1<<" n2 : "<<n2<<endl;
    cout<<"GMergeFaceSFS RevOri1 : "<<RevOri1<<endl;
  }
#endif
  
  if (performcom) {
    TopOpeBRepBuild_GTopo gF;
    if      (makecomsam) {
      gF = TopOpeBRepBuild_GTool::GComUnsh(TopAbs_FACE,TopAbs_FACE);
      gF.ChangeConfig(TopOpeBRepDS_SAMEORIENTED,TopOpeBRepDS_SAMEORIENTED);
    }
    else if (makecomdif) {
      gF = TopOpeBRepBuild_GTool::GComUnsh(TopAbs_FACE,TopAbs_FACE);
      gF.ChangeConfig(TopOpeBRepDS_SAMEORIENTED,TopOpeBRepDS_DIFFORIENTED);
    }
    
    GMergeFaces(*PtrLF1,*PtrLF2,gF);
    
    // on prend le resultat du merge de F ssi F est HasSameDomain et
    // qu'elle est la reference de ses faces SameDomain
    Standard_Boolean addmerge = Standard_False;
    Standard_Integer iFref = myDataStructure->SameDomainReference(FOR);
    const TopoDS_Shape& Fref = myDataStructure->Shape(iFref);
    Standard_Boolean Fisref = FOR.IsSame(Fref);
    addmerge = Fisref;
    
    if ( addmerge ) {
      const TopTools_ListOfShape& ME = Merged(FOR,TopAbs_IN);
      for(TopTools_ListIteratorOfListOfShape it(ME);it.More();it.Next()) {
      TopoDS_Shape newF = it.Value();
      newF.Orientation(neworiF);

#ifdef DEB
      if(tSPS){
      DEBSHASET(ss,"--- GMergeFaceSFS ",SFS," AddStartElement SFS+ face ");  
      GdumpSHA(newF,(Standard_Address)ss.ToCString());
      cout<<" ";TopAbs::Print(TB1,cout)<<" : 1 face ";
      TopAbs::Print(neworiF,cout); cout<<endl;
      }
#endif
      SFS.AddStartElement(newF);
      }
    }
  } // performcom
  
#ifdef DEB
  if(tSPS){cout<<"--------- end merge FACE "<<iFOR<<endl;}
#endif
  
} // GMergeFaceSFS

static Standard_Boolean FUN_SplitEvisoONperiodicF(const Handle(TopOpeBRepDS_HDataStructure)& HDS, const TopoDS_Shape& FF)
{
  const TopOpeBRepDS_ListOfInterference& LLI = HDS->DS().ShapeInterferences(FF);
  if (LLI.Extent() == 0) return Standard_True;
  TopOpeBRepDS_ListOfInterference LI;
  TopOpeBRepDS_ListIteratorOfListOfInterference ILI(LLI);     
  for (; ILI.More(); ILI.Next() ) LI.Append(ILI.Value());

  // LI3 = {I3 = (T(FACE),EG=EDGE,FS=FACE)}
  TopOpeBRepDS_ListOfInterference LI1; Standard_Integer nIGtEDGE = FUN_selectGKinterference(LI,TopOpeBRepDS_EDGE,LI1);
  if (nIGtEDGE < 1) return Standard_True;
  TopOpeBRepDS_ListOfInterference LI2; Standard_Integer nIStFACE = FUN_selectSKinterference(LI1,TopOpeBRepDS_FACE,LI2);
  if (nIStFACE < 1) return Standard_True;
  TopOpeBRepDS_ListOfInterference LI3; Standard_Integer nITRASHAFACE = FUN_selectTRASHAinterference(LI2,TopAbs_FACE,LI3);
  if (nITRASHAFACE < 1) return Standard_True;

  Handle(TopOpeBRepDS_ShapeShapeInterference) SSI; 
  ILI.Initialize(LI3);
  for (; ILI.More(); ILI.Next() ) {

    SSI = Handle(TopOpeBRepDS_ShapeShapeInterference)::DownCast(ILI.Value());
    TopOpeBRepDS_Kind GT,ST;Standard_Integer GI,SI;FDS_data(SSI,GT,GI,ST,SI);
      
    const TopoDS_Face& FS = TopoDS::Face( HDS->Shape(SI)); 
#ifdef DEB
    Standard_Integer iFS =
#endif
              HDS->Shape(FS); 
//    Standard_Boolean FSper = FUN_periodicS(FS);
    Standard_Boolean FSper = FUN_tool_closedS(FS);
    if (!FSper) continue;
    
    const TopoDS_Edge& EG = TopoDS::Edge(HDS->Shape(GI));
#ifdef DEB
    Standard_Integer iEG =
#endif
              HDS->Shape(EG);    
    Standard_Boolean isrest = HDS->DS().IsSectionEdge(EG);
    if (!isrest) continue;
    
    // --------------------------------------------------
    // <EG> has no representation on face <FS> yet, 
    // set the pcurve on <FS>.
    // --------------------------------------------------
    Standard_Real pf,pl,tol;
    Handle(Geom2d_Curve) PC = FC2D_CurveOnSurface(EG,FS,pf,pl,tol);
    if (PC.IsNull()) {
      TopoDS_Edge EEG = EG; Standard_Boolean ok = FUN_tool_pcurveonF(FS,EEG);
      if (!ok) Standard_ProgramError::Raise("_Builder::SplitONVisolineonCyl");
      Standard_Real f,l; PC = FC2D_CurveOnSurface(EEG,FS,f,l,tol);
    }
    
    Standard_Boolean uiso,viso;gp_Dir2d d2d;gp_Pnt2d o2d; 
    TopOpeBRepTool_TOOL::UVISO(PC,uiso,viso,d2d,o2d);
    if (!viso) continue;
    
    // a. cylinders same domain on cylindrical face, with closing edges non same domain :
    // the 2d rep. of an edge VisoLineOnCyl on the cylindrical face of the other shape 
    // is not bounded in [0,2PI].
    // b. cylinder + sphere interfering on the circular edge E (section edge) of the cylinder
    // with the E's 2d rep on the spherical surface not bounded in [0,2PI] (cto 016 D*).
    
    // We have to split the edge at point (2PI,v), and we translate
    // the split of u >= 2PI to have it in [0,2PI].
      
    TopOpeBRepDS_DataStructure& BDS = HDS->ChangeDS();
    TopOpeBRepDS_ListOfInterference EPIlist; FUN_getEPIonEds(FS,HDS,EPIlist); 
    TopOpeBRepDS_ListOfInterference loCPI;
#ifdef DEB
    Standard_Boolean recadre =
#endif
                  FUN_EPIforEvisoONperiodicF(EG,FS,EPIlist, HDS,loCPI);

    TopOpeBRepDS_ListOfInterference& lIEG = BDS.ChangeShapeInterferences(EG);
    lIEG.Append(loCPI);
    
#ifdef DEB
    Standard_Boolean trc = TopOpeBRepDS_GettraceSTRANGE();
    if (trc) {cout<<"!! recadre is "; if (!recadre) cout<<"not ";
            cout<<"done on face FS "<<iFS<<" for edge "<<iEG<<endl;}
#endif
  } // ILI
  return Standard_True;
}

//=======================================================================
//function : SplitEvisoONperiodicF

//purpose  : KPart for :
//           - cylinders tangent on their cylindrical face,
//           with closing edges not same domain,
//           - cylinder + sphere interfering on the circular edge E (tangent
//           to the spherical surface) of the cylinder with  :
//           E's 2d rep on the spherical surface not bounded in [0,2PI]
//            (cto 016 D*).

//           Adding EPI to split edges with pcurve on <F> a Visoline not 
//           U-bounded in [0,2PI].
// modifies : myDataStructure
//            Scans among the interferences attached to faces for FEI with
//            support <FS> = cylinder, geometry <EG>; adds pcurve on <FS> 
//            for edge <EG> if necessay.
//=======================================================================
void TopOpeBRepBuild_Builder::SplitEvisoONperiodicF()
{
//  myEsplitsONcycy.Clear();
  Standard_Integer nsha = myDataStructure->NbShapes();
  for (Standard_Integer i = 1; i <= nsha; i++) {
    const TopoDS_Shape& FOR = myDataStructure->Shape(i);
    Standard_Boolean isface = (FOR.ShapeType() == TopAbs_FACE);
    if (!isface) continue;

    TopLoc_Location loc; const Handle(Geom_Surface)& S = BRep_Tool::Surface(TopoDS::Face(FOR),loc);
    Standard_Boolean periodic = S->IsUPeriodic() || S->IsVPeriodic();
    if (!periodic) continue;

    TopoDS_Shape FF = FOR; FF.Orientation(TopAbs_FORWARD);
    
    Standard_Boolean ok = FUN_SplitEvisoONperiodicF(myDataStructure,FF);
    if (!ok) Standard_ProgramError::Raise("_Builder::SplitONVisolineonCyl");
  } // i
}

//=======================================================================
//function : GSplitFace
//purpose  : 
//=======================================================================
void TopOpeBRepBuild_Builder::GSplitFace
(const TopoDS_Shape& FOR,const TopOpeBRepBuild_GTopo& GG1,const TopTools_ListOfShape& LSclass)
{
  TopOpeBRepBuild_GTopo G1 = GG1;
  Standard_Boolean RevOri = Standard_False; 
  G1.SetReverse(RevOri);
  
  TopAbs_State TB1,TB2; G1.StatesON(TB1,TB2);
  TopAbs_ShapeEnum t1,t2; G1.Type(t1,t2);
  
  // work on a FORWARD face <FForward>
  TopoDS_Shape FF = FOR; FF.Orientation(TopAbs_FORWARD);
  
#ifdef DEB
  Standard_Integer iF; Standard_Boolean tSPS = GtraceSPS(FOR,iF);
  if(tSPS){
    cout<<endl;GdumpSHASTA(FOR,TB1,"--- GSplitFace ");
    cout<<endl;debsplitf(iF);
  }
#endif
  
  // make a WireEdgeSet WES on face FF
  TopOpeBRepBuild_WireEdgeSet WES(FF,this);
  
  // Add ON parts (edges ON solid)
  GFillONPartsWES(FOR,G1,LSclass,WES);
#ifdef DEB
  Standard_Integer n0 = WES.StartElements().Extent();
  if(tSPS) cout <<"--> GSplitFace , after GFillONPartsWES nstartelWES = "<<n0<<endl; 
#endif

  // save these edges
  TopTools_ListOfShape anEdgesON;
  TopTools_ListIteratorOfListOfShape it;
  if (myProcessON) {
    Standard_Boolean toRevOri = Opefus();
    for (it.Initialize(WES.StartElements()); it.More(); it.Next())
      anEdgesON.Append(toRevOri ? it.Value().Reversed() : it.Value());
    myONElemMap.Clear();
  }
  
  // split the edges of FF : add split edges to WES
  GFillFaceWES(FF,LSclass,G1,WES);
  Standard_Integer n1 = WES.StartElements().Extent();
#ifdef DEB
  if(tSPS) cout <<"--> GSplitFace , after GFillFaceWES nstartelWES = "<<n1<<endl; 
#endif
  
  // add edges built on curves supported by FF
  GFillCurveTopologyWES(FF,G1,WES);
  Standard_Integer n2 = WES.StartElements().Extent();
#ifdef DEB
  if(tSPS) cout <<"--> GSplitFace , after GFillCurveTopologyWES nstartelWES = "<<n2<<endl; 
#endif
  
  // myEdgeAvoid = StartElement edges of WES due to GFillCurveTopologyWES
  myEdgeAvoid.Clear();
  GCopyList(WES.StartElements(),(n1+1),n2,myEdgeAvoid);

  // mark FF as split TB1
  MarkSplit(FF,TB1);
  
  // build the new faces LOF on FF from the Wire/Edge set WES
  TopTools_ListOfShape LOF;
  GWESMakeFaces(FF,WES,LOF);

  if (myProcessON && (!anEdgesON.IsEmpty() || !myONElemMap.IsEmpty())) {
    // try to make patches with only ON parts.
    // prepare the map of used edges to not take the same matter two times
    TopTools_IndexedMapOfOrientedShape aMapOE;
    for (it.Initialize(LOF); it.More(); it.Next())
      for (TopExp_Explorer ex(it.Value(),TopAbs_EDGE); ex.More(); ex.Next())
        aMapOE.Add(ex.Current());

    FillOnPatches(anEdgesON,FOR,aMapOE);
    myONElemMap.Clear();
  }

  // LOFS : LOF faces located TB1 / LSclass = split faces of state TB1 of FF
  TopTools_ListOfShape& LOFS = ChangeSplit(FF,TB1);
  LOFS.Clear();
  GKeepShapes(FF,myEmptyShapeList,TB1,LOF,LOFS);
  
} // GSplitFace

//=======================================================================
//function : AddOnPatchesSFS
//purpose  : 
//=======================================================================

void TopOpeBRepBuild_Builder::AddONPatchesSFS(const TopOpeBRepBuild_GTopo& G1,
                                              TopOpeBRepBuild_ShellFaceSet& SFS)
{
  // select ON faces not same domain to make patches
  const Standard_Real scalMin = 0.999847695; // cos(PI/180)

  // iterate on faces from the first shape
  Standard_Integer i,j;
  for (i=1; i <= myONFacesMap.Extent(); i++) {
    const TopoDS_Shape& aFAnc1 = myONFacesMap(i);
    if (myDataStructure->DS().AncestorRank(aFAnc1) == 1) {
      const TopoDS_Face& aFace1 = TopoDS::Face(myONFacesMap.FindKey(i));
      // map edges of the first face
      TopTools_IndexedMapOfShape aMapE1;
      TopExp::MapShapes(aFace1, TopAbs_EDGE, aMapE1);
      // find a non-degenerated edge
      TopoDS_Edge aChkEdge;
      Standard_Integer k;
      for (k=1; k <= aMapE1.Extent() && aChkEdge.IsNull(); k++) {
        const TopoDS_Edge& aE = TopoDS::Edge(aMapE1(k));
        if (!BRep_Tool::Degenerated(aE))
          aChkEdge = aE;
      }
      if (aChkEdge.IsNull()) continue;
      // find a point and a normal
      BRepAdaptor_Curve2d aBAC1(aChkEdge, aFace1);
      gp_Pnt2d aP2d;
      const Standard_Real PAR_T = 0.456321;
      Standard_Real par = aBAC1.FirstParameter()*(1.-PAR_T) +
                          aBAC1.LastParameter() * PAR_T;
      aBAC1.D0(par, aP2d);
      BRepAdaptor_Surface aBAS1(aFace1);
      gp_Pnt aPbid;
      gp_Vec aN1,aDU,aDV;
      aBAS1.D1(aP2d.X(),aP2d.Y(),aPbid,aDU,aDV);
      aN1 = aDU ^ aDV;
      Standard_Real norm = aN1.Magnitude();
      if (norm < Precision::Confusion()) continue;
      aN1 /= norm;
      if (aFace1.Orientation() == TopAbs_REVERSED)
        aN1.Reverse();

      // iterate on faces from the second shape
      Standard_Boolean ok = Standard_True;
      for (j=i+1; j <= myONFacesMap.Extent() && ok; j++) {
        const TopoDS_Shape& aFAnc2 = myONFacesMap(j);
        if (myDataStructure->DS().AncestorRank(aFAnc2) == 2) {
          const TopoDS_Face& aFace2 = TopoDS::Face(myONFacesMap.FindKey(j));

          // check that the second face has the same boundaries
          TopTools_IndexedMapOfShape aMapE2;
          TopExp::MapShapes(aFace2, TopAbs_EDGE, aMapE2);
          if (aMapE1.Extent() != aMapE2.Extent()) continue;
          Standard_Boolean sameBnd = Standard_True;
          for (k=1; k <= aMapE2.Extent() && sameBnd; k++)
            if (!aMapE1.Contains(aMapE2(k)))
              sameBnd = Standard_False;
          if (!sameBnd) continue;

          // check if it is needed to have a patch here;
          // for that the normals should be oriented in the same sense.
          BRepAdaptor_Curve2d aBAC2(aChkEdge, aFace2);
          aBAC2.D0(par,aP2d);
          BRepAdaptor_Surface aBAS2(aFace2);
          gp_Vec aN2;
          aBAS2.D1(aP2d.X(),aP2d.Y(),aPbid,aDU,aDV);
          aN2 = aDU ^ aDV;
          norm = aN2.Magnitude();
          if (norm < Precision::Confusion()) {
            ok = Standard_False;
            continue;
          }
          aN2 /= norm;
          if (aFace2.Orientation() == TopAbs_REVERSED)
            aN2.Reverse();
          Standard_Real scal = aN1 * aN2;
          if (scal < scalMin) {
            ok = Standard_False;
            continue;
          }

          // select one of the two faces
          Standard_Boolean takeFirst = Standard_True;
          TopoDS_Face aPatch;
          TopAbs_Orientation neworiF;
          if (takeFirst) {
            aPatch = aFace1;
            neworiF = Orient(aFAnc1.Orientation(), G1.IsToReverse1());
          }
          else {
            aPatch = aFace2;
            neworiF = Orient(aFAnc2.Orientation(), G1.IsToReverse2());
          }
          aPatch.Orientation(neworiF);

          // add patch to SFS
          SFS.AddStartElement(aPatch);

          // save ON splits
          MarkSplit(aFAnc1,TopAbs_ON);
          TopTools_ListOfShape& aLOFS1 = ChangeSplit(aFAnc1,TopAbs_ON);
          aLOFS1.Append(aFace1);
          MarkSplit(aFAnc2,TopAbs_ON);
          TopTools_ListOfShape& aLOFS2 = ChangeSplit(aFAnc2,TopAbs_ON);
          aLOFS2.Append(aFace2);
        }
      }
    }
  }
}

//=======================================================================
//function : AreFacesCoincideInArea
//purpose  : 
//=======================================================================

static Standard_Boolean AreFacesCoincideInArea (const TopoDS_Shape& theBaseFace,
                                                const TopoDS_Shape& theFace,
                                                const TopoDS_Shape& theEdge,
                                                const TopTools_ListOfShape& allEdges,
                                                Standard_Boolean& isSameOri)
{
  // there are given:
  // theBaseFace, theFace - possibly coinciding faces;
  // allEdges - the edges lying on theBaseFace forming the new boundary loops,
  //            they determine the areas of coincidence;
  // theEdge - an edge from allEdges pointing to the area to check in.
  // we should check that the faces are coincide in this area and have 
  // the same orientation considering the orientations of the faces.

  TopAbs_Orientation anEdgeOri = theEdge.Orientation();
  if (anEdgeOri != TopAbs_FORWARD && anEdgeOri != TopAbs_REVERSED)
    return Standard_False;
  Standard_Boolean reverse = (anEdgeOri == TopAbs_REVERSED);

  TopoDS_Face aBaseFace = TopoDS::Face(theBaseFace);
  TopoDS_Face aFace = TopoDS::Face(theFace);
  TopoDS_Edge anEdge = TopoDS::Edge(theEdge);
  BRep_Builder BB;

  // create a ray from the inside of anEdge to the matter side
  Standard_Real pf,pl,tol;
  Standard_Boolean trim3d = Standard_True;
  Handle(Geom2d_Curve) PCref = BRep_Tool::CurveOnSurface(anEdge,aBaseFace,pf,pl);
  if (PCref.IsNull()) {
    PCref = FC2D_CurveOnSurface(anEdge,aBaseFace,pf,pl,tol,trim3d);
    if (PCref.IsNull()) return Standard_False;
    tol = BRep_Tool::Tolerance(anEdge);
    BB.UpdateEdge(anEdge,PCref,aBaseFace,tol);
  }

  const Standard_Real T = 0.456789;
  Standard_Real pm = (1.-T)*pf + T*pl;
  gp_Pnt2d pt; gp_Vec2d d1;
  PCref->D1(pm, pt, d1);
  if (d1.Magnitude() < gp::Resolution())
    return Standard_False;
  if (reverse) d1.Reverse();
  gp_Vec2d vecInside(-d1.Y(),d1.X());
  gp_Lin2d aLin(pt,vecInside);

  // find the nearest intersection of aLin with other edges
  Standard_Boolean hasInt = Standard_False;
  Standard_Real pLinMin = RealLast();
  Standard_Real tol2d = Precision::PConfusion();
  BRepClass_Intersector anInter;
  BRepClass_Edge aBCE;
  aBCE.Face() = aBaseFace;
  Standard_Real maxDist = Max (BRep_Tool::Tolerance(aBaseFace),
                               BRep_Tool::Tolerance(aFace));

  Standard_Boolean isError = Standard_False;
  TopTools_ListIteratorOfListOfShape it(allEdges);
  for (; it.More() && !isError; it.Next()) {
    const TopoDS_Edge& aE = TopoDS::Edge(it.Value());
    Standard_Real tolE = BRep_Tool::Tolerance(aE);
    if (tolE > maxDist) maxDist = tolE;
    if (aE.IsEqual(anEdge) ||
        aE.Orientation() != TopAbs_FORWARD && aE.Orientation() != TopAbs_REVERSED &&
        aE.IsSame(anEdge))
      continue;         // the same pcurve
    Handle(Geom2d_Curve) PC = BRep_Tool::CurveOnSurface(aE,aBaseFace,pf,pl);
    if (PC.IsNull()) {
      PC = FC2D_CurveOnSurface(aE,aBaseFace,pf,pl,tol,trim3d);
      if (PC.IsNull()) {isError = Standard_True; break;}
      BB.UpdateEdge(aE,PC,aBaseFace,tolE);
    }
    aBCE.Edge() = aE;
    anInter.Perform(aLin,pLinMin,tol2d,aBCE);
    if (anInter.IsDone()) {
      Standard_Integer i;
      for (i=1; i <= anInter.NbPoints(); i++) {
        const IntRes2d_IntersectionPoint& aIP = anInter.Point(i);
        Standard_Real pLin = aIP.ParamOnFirst();
        if (pLin > tol2d && pLin < pLinMin) {
          pLinMin = pLin;
          hasInt = Standard_True;
        }
      }
      for (i=1; i <= anInter.NbSegments() && !isError; i++) {
        const IntRes2d_IntersectionSegment& aIS = anInter.Segment(i);
        Standard_Real pLinF = aIS.HasFirstPoint() ? aIS.FirstPoint().ParamOnFirst()
          : -Precision::Infinite();
        Standard_Real pLinL = aIS.HasLastPoint() ? aIS.LastPoint().ParamOnFirst()
          : Precision::Infinite();
        if (pLinF < tol2d && pLinL > -tol2d) isError = Standard_True;
        else if (pLinF > tol2d && pLinF < pLinMin) {
          pLinMin = pLinF;
          hasInt = Standard_True;
        }
      }
    }
  }
  if (isError || !hasInt) return Standard_False;

  // create a point in the area and get the normal to aBaseFace at it
  gp_Pnt2d aP2d = ElCLib::Value(pLinMin*T,aLin);
  BRepAdaptor_Surface aBAS(aBaseFace);
  gp_Pnt aPnt; gp_Vec d1u,d1v;
  aBAS.D1(aP2d.X(),aP2d.Y(),aPnt,d1u,d1v);
  gp_Vec aNormBase = d1u ^ d1v;
  Standard_Real mag = aNormBase.Magnitude();
  if (mag < gp::Resolution()) return Standard_False;
  if (aBaseFace.Orientation() == TopAbs_REVERSED) mag = -mag;
  aNormBase /= mag;

  // project the point aPnt to the second face aFace
  Handle(Geom_Surface) aSurf = BRep_Tool::Surface(aFace);
  Standard_Real umin,umax,vmin,vmax;
  BRepTools::UVBounds(aFace,umin,umax,vmin,vmax);
  GeomAPI_ProjectPointOnSurf aProj(aPnt,aSurf,umin,umax,vmin,vmax);
  if (!aProj.NbPoints() || aProj.LowerDistance() > maxDist) return Standard_False;
  Standard_Real u,v;
  aProj.LowerDistanceParameters(u,v);
  aSurf->D1(u,v,aPnt,d1u,d1v);
  gp_Vec aNorm = d1u ^ d1v;
  mag = aNorm.Magnitude();
  if (mag < gp::Resolution()) return Standard_False;
  if (aFace.Orientation() == TopAbs_REVERSED) mag = -mag;
  aNorm /= mag;

  // check normales
  Standard_Real dot = aNormBase * aNorm;
  const Standard_Real minDot = 0.9999;
  if (Abs(dot) < minDot) return Standard_False;
  isSameOri = (dot > 0.);

  return Standard_True;
}

//=======================================================================
//function : FillOnPatches
//purpose  : 
//=======================================================================

void TopOpeBRepBuild_Builder::FillOnPatches
  (const TopTools_ListOfShape& anEdgesON,
   const TopoDS_Shape& aBaseFace,
   const TopTools_IndexedMapOfOrientedShape& avoidMap)
{
  TopoDS_Shape FF = aBaseFace; FF.Orientation(TopAbs_FORWARD);
  Standard_Integer rankBF = ShapeRank(aBaseFace);
  Standard_Integer rankOpp;
  if      (rankBF == 1) rankOpp = 2;
  else if (rankBF == 2) rankOpp = 1;
  else return;

  TopOpeBRepBuild_WireEdgeSet WES(FF,this);
  TopTools_MapOfShape aMapON,aMapON1;
  TopTools_DataMapOfShapeInteger aMapFState;

  TopTools_ListOfShape allEdges;
  TopTools_ListIteratorOfListOfShape it;
  TopoDS_Iterator itW;
  for (it.Initialize(anEdgesON); it.More(); it.Next()) {
    const TopoDS_Shape& aE = it.Value();
    // is it a part of the boundary of aBaseFace ?
    if (!myONElemMap.Contains(aE) && !myONElemMap.Contains(aE.Reversed()) &&
        !avoidMap.Contains(aE)) {
      allEdges.Append(aE);
      aMapON.Add(aE);
    }
  }
  Standard_Integer i;
  Standard_Boolean hasWires = Standard_False;
  for (i=1; i <= myONElemMap.Extent(); i++) {
    const TopoDS_Shape& aE = myONElemMap(i);
    if (aE.ShapeType() == TopAbs_WIRE) {
      for (itW.Initialize(aE); itW.More(); itW.Next())
        if (!avoidMap.Contains(itW.Value())) {
          allEdges.Append(itW.Value());
          hasWires = Standard_True;
        }
    }
    else if (!avoidMap.Contains(aE)) {
      allEdges.Append(aE);
      aMapON1.Add(aE);
    }
  }

  // +++
  // add elements from anEdgesON (they come from BuilderON)
  TopTools_DataMapOfShapeShape anAncMap;
  if (!aMapON.IsEmpty())
    FillSecEdgeAncestorMap(rankOpp,aMapON,anAncMap);
  if (!anAncMap.IsEmpty()) {
    for (it.Initialize(anEdgesON); it.More(); it.Next()) {
      const TopoDS_Shape& aE = it.Value();         // an ON part
      if (anAncMap.IsBound(aE) && !avoidMap.Contains(aE)) {
        const TopoDS_Shape& anAncE = anAncMap(aE); // its ancestor edge from opposite shape
        const TopTools_ListOfShape& aFaces =       // connex faces of anAncE
          FDSCNX_EdgeConnexityShapeIndex (anAncE,myDataStructure,rankOpp);
        // determine if aBaseFace has coinciding part on the left side of aE
        // with one of connex faces, and this pair of faces are same oriented
        Standard_Boolean isOnFace = Standard_False;
        TopTools_ListOfShape aFacesToCheck;
        TopTools_ListIteratorOfListOfShape itF;
        for (itF.Initialize(aFaces); itF.More() && !isOnFace; itF.Next()) {
          const TopoDS_Shape& aF = itF.Value();
          if (aMapFState.IsBound(aF)) {
            Standard_Integer state = aMapFState(aF);
            if (state) isOnFace = Standard_True;
          }
          else aFacesToCheck.Append(aF);
        }
        for (itF.Initialize(aFacesToCheck); itF.More() && !isOnFace; itF.Next()) {
          const TopoDS_Shape& aF = itF.Value();
          Standard_Boolean isSameOri = Standard_False;
          Standard_Boolean ok;
          if (aE.Orientation() != TopAbs_FORWARD && aE.Orientation() != TopAbs_REVERSED) {
            ok = AreFacesCoincideInArea(aBaseFace,aF,aE.Oriented(TopAbs_FORWARD),
                                        allEdges,isSameOri);
            ok = ok || AreFacesCoincideInArea(aBaseFace,aF,aE.Oriented(TopAbs_REVERSED),
                                        allEdges,isSameOri);
          }
          else
            ok = AreFacesCoincideInArea(aBaseFace,aF,aE, allEdges,isSameOri);
          if (ok && isSameOri) {
            aMapFState.Bind(aF,1);
            isOnFace = Standard_True;
          }
          else aMapFState.Bind(aF,0);
        }
        if (isOnFace)
          WES.AddStartElement(aE);
      }
    }
  }

  // +++
  // add elements from myONElemMap (consisting of parts of the boundary of aBaseFace)
  anAncMap.Clear();
  if (!aMapON1.IsEmpty())
    FillSecEdgeAncestorMap(rankBF,aMapON1,anAncMap);
  if (hasWires || !anAncMap.IsEmpty()) {
    for (i=1; i <= myONElemMap.Extent(); i++) {
      const TopoDS_Shape& aE = myONElemMap(i);
      TopoDS_Shape anEdge, anAncE;
      if (aE.ShapeType() == TopAbs_WIRE) {
        // for a wire get one non-degenerated edge for test
        for (itW.Initialize(aE); itW.More() && anEdge.IsNull(); itW.Next()) {
          const TopoDS_Edge& e = TopoDS::Edge(itW.Value());
          if (avoidMap.Contains(e)) break;
          if (!BRep_Tool::Degenerated(e))
            anEdge = anAncE = e;
        }
      }
      else if (anAncMap.IsBound(aE) && !avoidMap.Contains(aE)) {
        anEdge = aE;
        anAncE = anAncMap(aE);
      }
      if (!anEdge.IsNull()) {
        // find faces of the opposite shape touching anAncE
        TopTools_ListOfShape aFaces;
        FDSCNX_FaceEdgeConnexFaces (aBaseFace,anAncE,myDataStructure,aFaces);
        if (aFaces.IsEmpty()) continue;
        TopoDS_Shape aCnxF = aFaces.First();
        aFaces.Clear();
        FindFacesTouchingEdge (aCnxF,anAncE,rankOpp,aFaces);
        // determine if aBaseFace has coinciding part on the left side of anEdge
        // with one of found faces, and this pair of faces are same oriented
        Standard_Boolean isOnFace = Standard_False;
        TopTools_ListOfShape aFacesToCheck;
        TopTools_ListIteratorOfListOfShape itF;
        for (itF.Initialize(aFaces); itF.More() && !isOnFace; itF.Next()) {
          const TopoDS_Shape& aF = itF.Value();
          if (aMapFState.IsBound(aF)) {
            Standard_Integer state = aMapFState(aF);
            if (state) isOnFace = Standard_True;
          }
          else aFacesToCheck.Append(aF);
        }
        for (itF.Initialize(aFacesToCheck); itF.More() && !isOnFace; itF.Next()) {
          const TopoDS_Shape& aF = itF.Value();
          Standard_Boolean isSameOri = Standard_False;
          Standard_Boolean ok =
            AreFacesCoincideInArea (aBaseFace,aF,anEdge,allEdges,isSameOri);
          if (ok && isSameOri) {
            aMapFState.Bind(aF,1);
            isOnFace = Standard_True;
          }
          else aMapFState.Bind(aF,0);
        }
        if (isOnFace) {
          if (aE.ShapeType() == TopAbs_WIRE)
            WES.AddShape(aE);
          else
            WES.AddStartElement(aE);
        }
      }
    }
  }

  WES.InitShapes(); WES.InitStartElements();
  if (WES.MoreShapes() || WES.MoreStartElements()) {
    TopTools_ListOfShape LOF;
    GWESMakeFaces(FF,WES,LOF);
    // save ON faces
    for (it.Initialize(LOF); it.More(); it.Next()) {
      const TopoDS_Face& aF = TopoDS::Face(it.Value());
      myONFacesMap.Add(aF,aBaseFace);
    }
  }
}

//=======================================================================
//function : FindFacesTouchingEdge
//purpose  : 
//=======================================================================

void TopOpeBRepBuild_Builder::FindFacesTouchingEdge(const TopoDS_Shape& aFace,
                                                    const TopoDS_Shape& anEdge,
                                                    const Standard_Integer aShRank,
                                                    TopTools_ListOfShape& aFaces) const
{
  const TopOpeBRepDS_DataStructure& BDS=myDataStructure->DS();
  Standard_Integer anEdgeInd = BDS.Shape(anEdge);
  if (!anEdgeInd) return;

  const TopOpeBRepDS_ListOfInterference& LI=BDS.ShapeInterferences(aFace);
  TopOpeBRepDS_ListIteratorOfListOfInterference ILI(LI);
  for (;ILI.More();ILI.Next() ) {
    const Handle(TopOpeBRepDS_Interference)& I=ILI.Value();
    Handle(TopOpeBRepDS_ShapeShapeInterference) SSI=
      Handle(TopOpeBRepDS_ShapeShapeInterference)::DownCast(I);
    if (SSI.IsNull()) continue;
    TopOpeBRepDS_Kind GT,ST;Standard_Integer GI,SI;FDS_data(SSI,GT,GI,ST,SI);
    if (GT != TopOpeBRepDS_EDGE || ST != TopOpeBRepDS_FACE) continue;
    if (GI != anEdgeInd) continue;
    const TopOpeBRepDS_Transition& TFE=SSI->Transition();
    if (TFE.ShapeBefore() != TopAbs_FACE || TFE.ShapeAfter() != TopAbs_FACE) continue;
    const TopoDS_Shape& FS=BDS.Shape(SI);
    if (ShapeRank(FS) != aShRank) continue;
    aFaces.Append(FS);
  }
}

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