OCCT

// Created on: 1998-06-16
// Created by: Philippe NOUAILLE
// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#include <Adaptor3d_Surface.hxx>
#include <ChFiDS_Spine.hxx>
#include <ChFiDS_SurfData.hxx>
#include <ChFiKPart_ComputeData.hxx>
#include <ChFiKPart_ComputeData_Fcts.hxx>
#include <ElCLib.hxx>
#include <ElSLib.hxx>
#include <Geom2d_Circle.hxx>
#include <Geom2d_Line.hxx>
#include <Geom_Circle.hxx>
#include <Geom_ConicalSurface.hxx>
#include <Geom_CylindricalSurface.hxx>
#include <Geom_Line.hxx>
#include <Geom_Plane.hxx>
#include <gp.hxx>
#include <gp_Ax2.hxx>
#include <gp_Ax3.hxx>
#include <gp_Ax22d.hxx>
#include <gp_Circ.hxx>
#include <gp_Circ2d.hxx>
#include <gp_Dir.hxx>
#include <gp_Dir2d.hxx>
#include <gp_Lin2d.hxx>
#include <gp_Pnt.hxx>
#include <gp_Pnt2d.hxx>
#include <gp_Vec.hxx>
#include <IntAna_QuadQuadGeo.hxx>
#include <Precision.hxx>
#include <TopOpeBRepDS_DataStructure.hxx>

// pour tester
//=======================================================================
// function : MakeChAsym
// purpose  : Compute the chamfer in the particular case Plane/Cylinder
//            or Cylinder/Plane
//            Compute the SurfData <Data> of the chamfer build on the <Spine>
//            between the plane <Pln> and the cylinder <Cyl>, with the
//            distances <Dis> and <Angle> on <Pln> on <Cyl>.
//            <Or1> and <Or2> are the orientations of <Pln> and <Cyl>
//            and <Ofpl> this of the face carried by <Pln>.
//            <First> is the start point on the <Spine>
//            <Plandab> is equal to True if the plane is the surface S1
//            <fu> and <lu> are the first and last u parameters of the
//            cylinder
//            DisOnPlan is equal to True if Dis on plan, else False
// out      : True if the chanfer has been computed
//            False else
//=======================================================================
bool ChFiKPart_MakeChAsym(TopOpeBRepDS_DataStructure&         DStr,
                          const occ::handle<ChFiDS_SurfData>& Data,
                          const gp_Pln&                       Pln,
                          const gp_Cylinder&                  Cyl,
                          const double                        fu,
                          const double                        lu,
                          const TopAbs_Orientation            Or1,
                          const TopAbs_Orientation            Or2,
                          const double                        Dis,
                          const double                        Angle,
                          const gp_Circ&                      Spine,
                          const double                        First,
                          const TopAbs_Orientation            Ofpl,
                          const bool                          plandab,
                          const bool                          DisOnP)
{
  // compute the chamfer surface(cone)

  // compute the normals to the plane surface & to the plane face
  gp_Ax3 PosPl = Pln.Position();
  gp_Dir Dpl   = PosPl.XDirection().Crossed(PosPl.YDirection());
  gp_Dir norf  = Dpl;
  if (Ofpl == TopAbs_REVERSED)
  {
    norf.Reverse();
  }
  if (Or1 == TopAbs_REVERSED)
  {
    Dpl.Reverse();
  }

  // compute the origin Or of the cone
  gp_Pnt Or = Cyl.Location();
  double u, v;
  ElSLib::PlaneParameters(PosPl, Or, u, v);
  gp_Pnt2d pt2dPln(u, v);
  ElSLib::PlaneD0(u, v, PosPl, Or);
  gp_Pnt PtPl = Or; // projection of the cylinder origin
                    // on the plane

  gp_Pnt PtSp; // start 3d point on the Spine
  gp_Vec DSp;  // tangent vector to the spine on PtSp
  ElCLib::D1(First, Spine, PtSp, DSp);
  gp_Dir Dx(gp_Vec(Or, PtSp));
  gp_Dir Dy(DSp);
  ElSLib::Parameters(Cyl, PtSp, u, v);
  gp_Pnt PtCyl; // point on the cylinder and on the Spine
  gp_Vec Vu, Vv;
  ElSLib::D1(u, v, Cyl, PtCyl, Vu, Vv);
  gp_Dir Dcyl(Vu.Crossed(Vv)); // normal to the cylinder in PtSp
  if (Or2 == TopAbs_REVERSED)
  {
    Dcyl.Reverse();
  }
  bool dedans = (Dcyl.Dot(Dx) <= 0.);

  bool   pointu = false;
  double ConRad, Rad, SemiAngl;

  // Calculation of distance
  double dis1, dis2, cosNPCyl, sinNPCyl;

  if ((plandab && DisOnP) || (!plandab && !DisOnP))
  {
    dis1     = Dis;
    cosNPCyl = Dpl.Dot(Dcyl);
    sinNPCyl = sqrt(1. - cosNPCyl * cosNPCyl);
    dis2     = Dis / (sinNPCyl / tan(Angle) - cosNPCyl);
  }
  else
  {
    dis2     = Dis;
    cosNPCyl = Dpl.Dot(Dcyl);
    sinNPCyl = sqrt(1. - cosNPCyl * cosNPCyl);
    dis1     = Dis / (sinNPCyl / tan(Angle) - cosNPCyl);
  }

  Or.SetCoord(Or.X() + dis2 * Dpl.X(), Or.Y() + dis2 * Dpl.Y(), Or.Z() + dis2 * Dpl.Z());

  // variables used to compute the semiangle of the cone
  gp_Dir Vec1(Or.X() - PtPl.X(), Or.Y() - PtPl.Y(), Or.Z() - PtPl.Z());
  gp_Pnt Pt(Or.X() + dis1 * PosPl.XDirection().X(),
            Or.Y() + dis1 * PosPl.XDirection().Y(),
            Or.Z() + dis1 * PosPl.XDirection().Z());
  gp_Dir Vec2(Pt.X() - PtPl.X(), Pt.Y() - PtPl.Y(), Pt.Z() - PtPl.Z());

  // compute the parameters of the conical surface
  if (dedans)
  {
    Rad = Cyl.Radius() - dis1;
    if (std::abs(Rad) <= Precision::Confusion())
    {
      pointu = true;
    }
    if (Rad < 0)
    {
#ifdef OCCT_DEBUG
      std::cout << "the chamfer can't pass" << std::endl;
#endif
      return false;
    }
  }
  else
  {
    Rad         = Cyl.Radius() + dis1;
    gp_Dir Dplr = Dpl.Reversed();
    Dpl         = Dplr;
  }
  ConRad   = Cyl.Radius();
  SemiAngl = Vec1.Angle(Vec2);
  gp_Ax3 ConAx3(Or, Dpl, Dx);

  occ::handle<Geom_ConicalSurface> gcon = new Geom_ConicalSurface(ConAx3, SemiAngl, ConRad);

  // changes due to the fact the parameters of the chamfer must go increasing
  // from surface S1 to surface S2
  if ((dedans && !plandab) || (!dedans && plandab))
  {
    gcon->VReverse(); // be careful : the SemiAngle was changed
    ConAx3   = gcon->Position();
    SemiAngl = gcon->SemiAngle();
  }

  // changes due to the fact we have reversed the V direction of
  // parametrization
  if (ConAx3.YDirection().Dot(DSp) <= 0.)
  {
    ConAx3.YReverse();
    gcon->SetPosition(ConAx3);
  }

  Data->ChangeSurf(ChFiKPart_IndexSurfaceInDS(gcon, DStr));

  // compute the chamfer's orientation according to the orientation
  // of the faces

  // search the normal to the cone
  gp_Vec deru, derv;
  ElSLib::ConeD1(0., 0., ConAx3, ConRad, SemiAngl, Pt, deru, derv);

  gp_Dir norCon(deru.Crossed(derv));

  bool toreverse = (norCon.Dot(norf) <= 0.);
  if (toreverse)
  {
    Data->ChangeOrientation() = TopAbs_REVERSED;
  }
  else
  {
    Data->ChangeOrientation() = TopAbs_FORWARD;
  }

  // we load of the faceInterference with the pcurves and
  //  the 3d curves

  // Case of the plane face
  // NB: in the case 'pointu', no pcurve on the plane surface
  // and no intersection plane-chamfer are needed
  occ::handle<Geom2d_Circle> GCir2dPln;
  occ::handle<Geom_Circle>   GCirPln;
  gp_Ax2                     CirAx2 = ConAx3.Ax2();
  CirAx2.SetLocation(PtPl);

  if (!pointu)
  {
    // intersection plane-chamfer
    gp_Circ CirPln(CirAx2, Rad);
    GCirPln = new Geom_Circle(CirPln);

    // pcurve on the plane
    ElSLib::PlaneParameters(PosPl, Pt, u, v);
    gp_Pnt2d  p2dPln(u, v);
    gp_Dir2d  d2d(DSp.Dot(PosPl.XDirection()), DSp.Dot(PosPl.YDirection()));
    gp_Ax22d  ax2dPln(pt2dPln, gp_Dir2d(gp_Vec2d(pt2dPln, p2dPln)), d2d);
    gp_Circ2d cir2dPln(ax2dPln, Rad);
    GCir2dPln = new Geom2d_Circle(cir2dPln);
  }

  // pcurve on the chamfer
  gp_Pnt2d p2dch;
  if (plandab)
  {
    v = -sqrt(dis1 * dis1 + dis2 * dis2);
  }
  else
  {
    v = sqrt(dis1 * dis1 + dis2 * dis2);
  }
  p2dch.SetCoord(0., v);
  ElSLib::ConeD1(0., v, ConAx3, ConRad, SemiAngl, Pt, deru, derv);
  gp_Lin2d                 lin2dch(p2dch, gp::DX2d());
  occ::handle<Geom2d_Line> GLin2dCh1 = new Geom2d_Line(lin2dch);

  // orientation
  TopAbs_Orientation trans;
  gp_Dir             norpl = PosPl.XDirection().Crossed(PosPl.YDirection());
  toreverse                = (norCon.Dot(norpl) <= 0.);
  if ((toreverse && plandab) || (!toreverse && !plandab))
  {
    trans = TopAbs_FORWARD;
  }
  else
  {
    trans = TopAbs_REVERSED;
  }

  if (plandab)
  {
    Data->ChangeInterferenceOnS1().SetInterference(ChFiKPart_IndexCurveInDS(GCirPln, DStr),
                                                   trans,
                                                   GCir2dPln,
                                                   GLin2dCh1);
  }
  else
  {
    Data->ChangeInterferenceOnS2().SetInterference(ChFiKPart_IndexCurveInDS(GCirPln, DStr),
                                                   trans,
                                                   GCir2dPln,
                                                   GLin2dCh1);
  }

  // Case of the cylindrical face

  // intersection cylinder-chamfer
  CirAx2.SetLocation(Or);
  gp_Circ                  CirCyl(CirAx2, ConRad);
  occ::handle<Geom_Circle> GCirCyl = new Geom_Circle(CirCyl);

  // pcurve on the chamfer
  p2dch.SetCoord(0., 0.);
  ElSLib::ConeD1(0., 0., ConAx3, ConRad, SemiAngl, Pt, deru, derv);
  lin2dch.SetLocation(p2dch);
  occ::handle<Geom2d_Line> GLin2dCh2 = new Geom2d_Line(lin2dch);

  // pcurve on the cylinder
  norCon.SetXYZ(deru.Crossed(derv).XYZ());

  Pt.SetCoord(Or.X() + ConRad * Dx.X(), Or.Y() + ConRad * Dx.Y(), Or.Z() + ConRad * Dx.Z());
  ElSLib::Parameters(Cyl, Pt, u, v);
  double tol           = Precision::PConfusion();
  bool   careaboutsens = false;
  if (std::abs(lu - fu - 2 * M_PI) < tol)
  {
    careaboutsens = true;
  }
  if (u >= fu - tol && u < fu)
  {
    u = fu;
  }
  if (u <= lu + tol && u > lu)
  {
    u = lu;
  }
  if (u < fu || u > lu)
  {
    u = ChFiKPart_InPeriod(u, fu, fu + 2 * M_PI, tol);
  }

  ElSLib::D1(u, v, Cyl, Pt, deru, derv);
  gp_Dir   norcyl = deru.Crossed(derv);
  gp_Dir2d d2dCyl = gp::DX2d();
  if (deru.Dot(Dy) < 0.)
  {
    d2dCyl.Reverse();
    if (careaboutsens && std::abs(fu - u) < tol)
    {
      u = lu;
    }
  }
  else if (careaboutsens && std::abs(lu - u) < tol)
  {
    u = fu;
  }
  gp_Pnt2d                 p2dCyl(u, v);
  gp_Lin2d                 lin2dCyl(p2dCyl, d2dCyl);
  occ::handle<Geom2d_Line> GLin2dCyl = new Geom2d_Line(lin2dCyl);

  // orientation
  toreverse = (norCon.Dot(norcyl) <= 0.);
  if ((toreverse && plandab) || (!toreverse && !plandab))
  {
    trans = TopAbs_REVERSED;
  }
  else
  {
    trans = TopAbs_FORWARD;
  }

  if (plandab)
  {
    Data->ChangeInterferenceOnS2().SetInterference(ChFiKPart_IndexCurveInDS(GCirCyl, DStr),
                                                   trans,
                                                   GLin2dCyl,
                                                   GLin2dCh2);
  }
  else
  {
    Data->ChangeInterferenceOnS1().SetInterference(ChFiKPart_IndexCurveInDS(GCirCyl, DStr),
                                                   trans,
                                                   GLin2dCyl,
                                                   GLin2dCh2);
  }

  return true;
}

//=======================================================================
// function : MakeChAsym
// purpose  : case cylinder/plane or plane/cylinder.
//=======================================================================

bool ChFiKPart_MakeChAsym(TopOpeBRepDS_DataStructure&         DStr,
                          const occ::handle<ChFiDS_SurfData>& Data,
                          const gp_Pln&                       Pln,
                          const gp_Cylinder&                  Cyl,
                          const double /*fu*/,
                          const double /*lu*/,
                          const TopAbs_Orientation Or1,
                          const TopAbs_Orientation Or2,
                          const double             Dis,
                          const double             Angle,
                          const gp_Lin&            Spine,
                          const double             First,
                          const TopAbs_Orientation Ofpl,
                          const bool               plandab,
                          const bool               DisOnP)
{
  // calculation of the fillet plane.
  // or1 and or2 permit to determine in which of four sides created by
  // intersection of 2 surfaces we are
  //        _|_          Ofpl is orientation of the plane face allowing
  //         |4          to determine the side of the material

  gp_Pnt OrSpine = ElCLib::Value(First, Spine);
  gp_Pnt POnCyl, POnPln, OrCyl;

  gp_Dir XDir   = Spine.Direction();
  gp_Ax3 AxPln  = Pln.Position();
  gp_Dir NorPln = AxPln.XDirection().Crossed(AxPln.YDirection());
  gp_Dir NorF(NorPln);
  if (Or1 == TopAbs_REVERSED)
  {
    NorF.Reverse();
  }

  gp_Ax3 AxCyl = Cyl.Position();
  // OrCyl is the point on axis of cylinder in the plane normal to the
  // axis containing OrSpine
  gp_Pnt Loc = AxCyl.Location();
  gp_Vec LocSp(Loc, OrSpine);
  gp_XYZ temp = AxCyl.Direction().XYZ();
  temp        = temp.Multiplied(LocSp.XYZ().Multiplied(temp));
  OrCyl.SetXYZ((Loc.XYZ()).Added(temp));

  // construction of POnPln
  gp_Vec VecTranslPln, tmp;

  tmp = gp_Vec(OrSpine, OrCyl);
  if ((Or2 == TopAbs_FORWARD && Cyl.Direct()) || (Or2 == TopAbs_REVERSED && !Cyl.Direct()))
  {
    tmp.Reverse();
  }

  VecTranslPln = gp_Vec(XDir.Crossed(NorPln));
  if (VecTranslPln.Dot(tmp) <= 0.)
  {
    VecTranslPln.Reverse();
  }

  gp_Vec VecTranslCyl;
  VecTranslCyl = gp_Vec(OrSpine, OrCyl);

  // Calculation of distances dis1 and dis2, depending on Dis and Angle
  gp_Vec DirSOrC = VecTranslCyl.Normalized();
  double cosA1   = DirSOrC.Dot(VecTranslPln.Normalized());
  double sinA1   = std::sqrt(1. - cosA1 * cosA1);
  double dis1    = 0.;
  double dis2, ray = Cyl.Radius();
  bool   IsDisOnP = ((plandab && DisOnP) || (!plandab && !DisOnP));

  if (IsDisOnP)
  {
    dis1         = Dis;
    double sinAl = std::sin(Angle), cosAl = std::cos(Angle);
    double h       = dis1 * sinAl;
    double cosAhOC = cosA1 * sinAl + sinA1 * cosAl;
    double sinAhOC = sinA1 * sinAl - cosA1 * cosAl;
    if (cosA1 > 0)
    {
      sinAhOC = -sinAhOC;
    }
    double temp1 = h / ray, temp2 = sinAhOC * sinAhOC + temp1 * cosAhOC;

    dis2 = temp2 + temp1 * (cosAhOC - temp1);

    if (dis2 < -1.E-09)
    {
#ifdef OCCT_DEBUG
      std::cout << "too great angle of chamfer" << std::endl;
#endif
      return false;
    }
    else if (dis2 < 1.E-09)
    {
      dis2 = ray * std::sqrt(2. * temp2);
    }
    else
    {
      dis2 = ray * std::sqrt(2. * (temp2 - sinAhOC * std::sqrt(dis2)));
    }
  }
  else
  {
    dis2 = Dis;
  }

  // construction of POnCyl
  double alpha   = (2 * std::asin(dis2 * 0.5 / ray));
  gp_Vec VecTemp = VecTranslCyl.Reversed();

  if ((XDir.Crossed(gp_Dir(VecTranslCyl))).Dot(NorF) < 0.)
  {
    VecTemp.Rotate(gp_Ax1(OrCyl, XDir), alpha);
  }
  else
  {
    VecTemp.Rotate(gp_Ax1(OrCyl, XDir.Reversed()), alpha);
  }

  POnCyl.SetXYZ(OrCyl.XYZ().Added(VecTemp.XYZ()));
  double UOnCyl, VOnCyl, UOnPln, VOnPln;
  gp_Vec DUOnCyl, DVOnCyl;
  ElSLib::Parameters(Cyl, POnCyl, UOnCyl, VOnCyl);
  ElSLib::CylinderD1(UOnCyl, VOnCyl, AxCyl, Cyl.Radius(), POnCyl, DUOnCyl, DVOnCyl);

  // Construction of the point on the plane
  if (!IsDisOnP)
  {
    gp_Vec Corde(POnCyl, OrSpine);
    gp_Vec TCyl = DUOnCyl.Crossed(DVOnCyl);

    TCyl = XDir.Crossed(TCyl);
    TCyl.Normalize();
    Corde.Normalize();
    double cosCorTan = TCyl.Dot(Corde);
    double tgCorTan  = 1. / (cosCorTan * cosCorTan);
    tgCorTan         = std::sqrt(tgCorTan - 1.);

    double tgAng = tan(Angle);
    tgAng        = (tgAng + tgCorTan) / (1. - tgAng * tgCorTan);

    double cosA11 = dis2 / (2. * ray);
    double sinA11 = std::sqrt(1. - cosA11 * cosA11);
    if (cosA1 > 0)
    {
      sinA11 = -sinA11;
    }
    dis1 = (sinA1 + cosA1 * tgAng) * cosA11;
    dis1 -= (cosA1 - sinA1 * tgAng) * sinA11;
    dis1 = (dis2 * tgAng) / dis1;
  }

  VecTranslPln.Multiply(dis1);

  POnPln.SetXYZ((OrSpine.XYZ()).Added(VecTranslPln.XYZ()));

  // construction of the chamfer
  ElSLib::Parameters(Pln, POnPln, UOnPln, VOnPln);
  POnPln = ElSLib::PlaneValue(UOnPln, VOnPln, AxPln);

  // construction of YDir to go from face1 to face2.
  gp_Vec YDir(POnPln, POnCyl);
  if (!plandab)
  {
    YDir.Reverse();
  }
  gp_Ax3 AxCh(POnPln, XDir.Crossed(YDir), XDir);

  occ::handle<Geom_Plane> Chamfer = new Geom_Plane(AxCh);
  Data->ChangeSurf(ChFiKPart_IndexSurfaceInDS(Chamfer, DStr));

  // FaceInterferences are loaded with pcurves and curves 3d.
  //----------- edge plan-Chamfer
  gp_Pnt2d PPln2d(UOnPln, VOnPln);
  gp_Dir2d VPln2d(XDir.Dot(AxPln.XDirection()), XDir.Dot(AxPln.YDirection()));
  gp_Lin2d Lin2dPln(PPln2d, VPln2d);

  POnPln = ElSLib::Value(UOnPln, VOnPln, Pln);
  gp_Lin C3d(POnPln, XDir);

  double U, VOnChamfer;
  ElSLib::PlaneParameters(AxCh, POnPln, U, VOnChamfer);
  gp_Lin2d LOnChamfer(gp_Pnt2d(U, VOnChamfer), gp::DX2d());

  occ::handle<Geom_Line>   L3d  = new Geom_Line(C3d);
  occ::handle<Geom2d_Line> LFac = new Geom2d_Line(Lin2dPln);
  occ::handle<Geom2d_Line> LFil = new Geom2d_Line(LOnChamfer);

  gp_Dir NorFil    = AxCh.Direction();
  bool   toreverse = (NorFil.Dot(NorPln) <= 0.);
  gp_Dir DirPlnCyl(gp_Vec(POnPln, POnCyl));
  gp_Dir DirSPln(gp_Vec(OrSpine, POnPln));
  bool   PosChamfPln = DirPlnCyl.Dot(DirSPln) > 0;

  if (!IsDisOnP && PosChamfPln)
  {
    toreverse = !toreverse;
  }
  // It is checked if the orientation of the Chamfer is the same as of the plane
  if (toreverse)
  {
    Data->ChangeOrientation() = TopAbs::Reverse(Ofpl);
  }
  else
  {
    Data->ChangeOrientation() = Ofpl;
  }

  TopAbs_Orientation trans = TopAbs_FORWARD;
  if ((!plandab && toreverse) || (plandab && !toreverse))
  {
    trans = TopAbs_REVERSED;
  }

  // trans allows to determine the "material" side on S1(2) limited by L3d
  if (plandab)
  {
    Data->ChangeInterferenceOnS1().SetInterference(ChFiKPart_IndexCurveInDS(L3d, DStr),
                                                   trans,
                                                   LFac,
                                                   LFil);
  }
  else
  {
    Data->ChangeInterferenceOnS2().SetInterference(ChFiKPart_IndexCurveInDS(L3d, DStr),
                                                   trans,
                                                   LFac,
                                                   LFil);
  }

  //------------edge cylindre-Chamfer
  gp_Pnt2d PCyl2d(UOnCyl, VOnCyl);
  gp_Dir2d VCyl2d = gp::DY2d();
  if (XDir.Dot(AxCyl.Direction()) < 0)
  {
    VCyl2d.Reverse();
  }
  gp_Lin2d Lin2dCyl(PCyl2d, VCyl2d);

  POnCyl = ElSLib::Value(UOnCyl, VOnCyl, Cyl);
  C3d    = gp_Lin(POnCyl, XDir);

  ElSLib::PlaneParameters(AxCh, POnCyl, U, VOnChamfer);
  LOnChamfer = gp_Lin2d(gp_Pnt2d(U, VOnChamfer), gp::DX2d());

  L3d  = new Geom_Line(C3d);
  LFac = new Geom2d_Line(Lin2dCyl);
  LFil = new Geom2d_Line(LOnChamfer);

  gp_Vec deru, derv;
  ElSLib::CylinderD1(UOnCyl, VOnCyl, AxCyl, Cyl.Radius(), POnCyl, deru, derv);
  gp_Dir NorCyl(deru.Crossed(derv));
  gp_Dir DirSCyl(gp_Vec(OrSpine, POnCyl));
  bool   PosChamfCyl = DirPlnCyl.Dot(DirSCyl) < 0;
  toreverse          = (NorFil.Dot(NorCyl) <= 0.);

  if (IsDisOnP && PosChamfCyl)
  {
    toreverse = !toreverse;
  }
  trans = TopAbs_REVERSED;
  if ((!plandab && toreverse) || (plandab && !toreverse))
  {
    trans = TopAbs_FORWARD;
  }

  if (plandab)
  {
    Data->ChangeInterferenceOnS2().SetInterference(ChFiKPart_IndexCurveInDS(L3d, DStr),
                                                   trans,
                                                   LFac,
                                                   LFil);
  }
  else
  {
    Data->ChangeInterferenceOnS1().SetInterference(ChFiKPart_IndexCurveInDS(L3d, DStr),
                                                   trans,
                                                   LFac,
                                                   LFil);
  }
  return true;
}