[occt.git] / src / Contap / Contap_SurfFunction.cxx

// Created on: 1993-06-03
// Created by: Jacques GOUSSARD
// Copyright (c) 1993-1999 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.

// jag 940616 #define Tolpetit 1.e-16

#include <Contap_SurfFunction.ixx>

#include <Contap_SurfProps.hxx>
#include <Contap_HContTool.hxx>
#include <Adaptor3d_HSurfaceTool.hxx>

Contap_SurfFunction::Contap_SurfFunction ():
  myMean(1.),
  myType(Contap_ContourStd),
  myDir(0.,0.,1.),
  myCosAng(0.), // PI/2 - Angle de depouille
  tol(1.e-6),
  computed(Standard_False),
  derived(Standard_False)
{}

void Contap_SurfFunction::Set(const Handle(Adaptor3d_HSurface)& S)
{
  mySurf = S;
  Standard_Integer i;
  Standard_Integer nbs = Contap_HContTool::NbSamplePoints(S);
  Standard_Real U,V;
  gp_Vec norm;
  if (nbs > 0) {
    myMean = 0.;
    for (i = 1; i <= nbs; i++) {
      Contap_HContTool::SamplePoint(S,i,U,V);
      //      Adaptor3d_HSurfaceTool::D1(S,U,V,solpt,d1u,d1v);
      //      myMean = myMean + d1u.Crossed(d1v).Magnitude();
      Contap_SurfProps::Normale(S,U,V,solpt,norm);
      myMean = myMean + norm.Magnitude();
    }
    myMean = myMean / ((Standard_Real)nbs);
  }
  computed = Standard_False;
  derived = Standard_False;
}


Standard_Integer Contap_SurfFunction::NbVariables () const
{
  return 2;
}

Standard_Integer Contap_SurfFunction::NbEquations () const
{
  return 1;
}


Standard_Boolean Contap_SurfFunction::Value(const math_Vector& X,
                                            math_Vector& F)
{
  Usol = X(1); Vsol = X(2);
  //  Adaptor3d_HSurfaceTool::D1(mySurf,Usol,Vsol,solpt,d1u,d1v);
  //  gp_Vec norm(d1u.Crossed(d1v));
  gp_Vec norm;
  Contap_SurfProps::Normale(mySurf,Usol,Vsol,solpt,norm);
  switch (myType) {
  case Contap_ContourStd:
    {
      F(1) = valf = (norm.Dot(myDir))/myMean;
    }
    break;
  case Contap_ContourPrs:
    {
      F(1) = valf = (norm.Dot(gp_Vec(myEye,solpt)))/myMean;
    }
    break;
  case Contap_DraftStd:
    {
      F(1) = valf = (norm.Dot(myDir)-myCosAng*norm.Magnitude())/myMean;
    }
    break;
  default:
    {
    }
  }
  computed = Standard_False;
  derived = Standard_False;
  return Standard_True;
}


Standard_Boolean Contap_SurfFunction::Derivatives(const math_Vector& X,
                                                  math_Matrix& Grad)
{
  //  gp_Vec d2u,d2v,d2uv;
  Usol = X(1); Vsol = X(2);
  //  Adaptor3d_HSurfaceTool::D2(mySurf,Usol,Vsol,solpt,d1u,d1v,d2u,d2v,d2uv);

  gp_Vec norm,dnu,dnv;
  Contap_SurfProps::NormAndDn(mySurf,Usol,Vsol,solpt,norm,dnu,dnv);

  switch (myType) {
  case Contap_ContourStd:
    {
      //      Grad(1,1) = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(myDir))/myMean;
      //      Grad(1,2) = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(myDir))/myMean;
      Grad(1,1) = (dnu.Dot(myDir))/myMean;
      Grad(1,2) = (dnv.Dot(myDir))/myMean;
    }
    break;
  case Contap_ContourPrs:
    {
      gp_Vec Ep(myEye,solpt);
      Grad(1,1) = (dnu.Dot(Ep))/myMean;
      Grad(1,2) = (dnv.Dot(Ep))/myMean;
    }
    break;
  case Contap_DraftStd:
    {
      //      gp_Vec norm(d1u.Crossed(d1v).Normalized());
      //      gp_Vec dnorm(d2u.Crossed(d1v) + d1u.Crossed(d2uv));
      //      Grad(1,1) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
      //      dnorm = d2uv.Crossed(d1v) + d1u.Crossed(d2v);
      //      Grad(1,2) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
      norm.Normalize();
      Grad(1,1) = (dnu.Dot(myDir)-myCosAng*dnu.Dot(norm))/myMean;
      Grad(1,2) = (dnv.Dot(myDir)-myCosAng*dnv.Dot(norm))/myMean;
    }
    break;
  case Contap_DraftPrs:
  default:
    {
    }
  }
  Fpu = Grad(1,1); Fpv = Grad(1,2);
  computed = Standard_False;
  derived = Standard_True;
  return Standard_True;
}


Standard_Boolean Contap_SurfFunction::Values (const math_Vector& X,
                                              math_Vector& F,
                                              math_Matrix& Grad)
{
  //  gp_Vec d2u,d2v,d2uv;

  Usol = X(1); Vsol = X(2);
  //  Adaptor3d_HSurfaceTool::D2(mySurf,Usol,Vsol,solpt,d1u,d1v,d2u,d2v,d2uv);
  //  gp_Vec norm(d1u.Crossed(d1v));
  gp_Vec norm,dnu,dnv;
  Contap_SurfProps::NormAndDn(mySurf,Usol,Vsol,solpt,norm,dnu,dnv);

  switch (myType) {

  case Contap_ContourStd:
    {
      F(1)      = (norm.Dot(myDir))/myMean;
      //      Grad(1,1) = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(myDir))/myMean;
      //      Grad(1,2) = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(myDir))/myMean;
      Grad(1,1) = (dnu.Dot(myDir))/myMean;
      Grad(1,2) = (dnv.Dot(myDir))/myMean;
    }
    break;
  case Contap_ContourPrs:
    {
      gp_Vec Ep(myEye,solpt);
      F(1)      = (norm.Dot(Ep))/myMean;
      //      Grad(1,1) = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(Ep))/myMean;
      //      Grad(1,2) = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(Ep))/myMean;
      Grad(1,1) = (dnu.Dot(Ep))/myMean;
      Grad(1,2) = (dnv.Dot(Ep))/myMean;
    }
    break;
  case Contap_DraftStd:
    {
      F(1) = (norm.Dot(myDir)-myCosAng*norm.Magnitude())/myMean;
      norm.Normalize();
      /*
      gp_Vec dnorm(d2u.Crossed(d1v) + d1u.Crossed(d2uv));
      Grad(1,1) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
      dnorm = d2uv.Crossed(d1v) + d1u.Crossed(d2v);
      Grad(1,2) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
      */
      Grad(1,1) = (dnu.Dot(myDir)-myCosAng*dnu.Dot(norm))/myMean;
      Grad(1,2) = (dnv.Dot(myDir)-myCosAng*dnv.Dot(norm))/myMean;
    }
    break;
  case Contap_DraftPrs:
  default:
    {
    }
  }
  valf = F(1);
  Fpu = Grad(1,1); Fpv = Grad(1,2);
  computed = Standard_False;
  derived = Standard_True;
  return Standard_True;
}


Standard_Boolean Contap_SurfFunction::IsTangent ()
{
  if (!computed) {
    computed = Standard_True;
    if(!derived) {
      //      gp_Vec d2u,d2v,d2uv;
      //      Adaptor3d_HSurfaceTool::D2(mySurf, Usol, Vsol, solpt, d1u, d1v, d2u, d2v, d2uv);
      gp_Vec norm,dnu,dnv;
      Contap_SurfProps::NormAndDn(mySurf,Usol,Vsol,solpt,norm,dnu,dnv);

      switch (myType) {
      case Contap_ContourStd:
        {
          //	  Fpu = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(myDir))/myMean;
          //	  Fpv = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(myDir))/myMean;
          Fpu = (dnu.Dot(myDir))/myMean;
          Fpv = (dnv.Dot(myDir))/myMean;
        }
        break;
      case Contap_ContourPrs:
        {
          gp_Vec Ep(myEye,solpt);
          //	  Fpu = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(Ep))/myMean;
          //	  Fpv = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(Ep))/myMean;
          Fpu = (dnu.Dot(Ep))/myMean;
          Fpv = (dnv.Dot(Ep))/myMean;
        }
        break;
      case Contap_DraftStd:
        {
          /*
          gp_Vec norm(d1u.Crossed(d1v).Normalized());
          gp_Vec dnorm(d2u.Crossed(d1v) + d1u.Crossed(d2uv));
          Fpu = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
          dnorm = d2uv.Crossed(d1v) + d1u.Crossed(d2v);
          Fpv = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
          */
          norm.Normalize();
          Fpu = (dnu.Dot(myDir)-myCosAng*dnu.Dot(norm))/myMean;
          Fpv = (dnv.Dot(myDir)-myCosAng*dnv.Dot(norm))/myMean;
        }
        break;
      case Contap_DraftPrs:
      default:
        {
        }
      }
      derived = Standard_True;
    }
    tangent = Standard_False;
    Standard_Real D = Sqrt (Fpu * Fpu + Fpv * Fpv);

    if (D <= gp::Resolution()) {
      tangent = Standard_True;
    }
    else {
      d2d = gp_Dir2d(-Fpv,Fpu);
      gp_Vec d1u,d1v;
      Adaptor3d_HSurfaceTool::D1(mySurf, Usol, Vsol, solpt, d1u, d1v); // ajout jag 02.95

      gp_XYZ d3dxyz(-Fpv*d1u.XYZ());
      d3dxyz.Add(Fpu*d1v.XYZ());
      d3d.SetXYZ(d3dxyz);

      //jag 940616    if (d3d.Magnitude() <= Tolpetit) {
      if (d3d.Magnitude() <= tol) {
        tangent = Standard_True;
      }
    }
  }
  return tangent;
}
Commit	Line	Data
b311480e	1	// Created on: 1993-06-03
	2	// Created by: Jacques GOUSSARD
	3	// Copyright (c) 1993-1999 Matra Datavision
973c2be1	4	// Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e	5	//
973c2be1	6	// This file is part of Open CASCADE Technology software library.
b311480e	7	//
d5f74e42	8	// This library is free software; you can redistribute it and/or modify it under
d5f74e42	9	// the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1	10	// by the Free Software Foundation, with special exception defined in the file
	11	// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
	12	// distribution for complete text of the license and disclaimer of any warranty.
b311480e	13	//
973c2be1	14	// Alternatively, this file may be used under the terms of Open CASCADE
973c2be1	15	// commercial license or contractual agreement.
733a0e55	16
7fd59977	17	// jag 940616 #define Tolpetit 1.e-16
7fd59977	18
e2065c2f	19	#include <Contap_SurfFunction.ixx>
7fd59977	20
e2065c2f	21	#include <Contap_SurfProps.hxx>
	22	#include <Contap_HContTool.hxx>
	23	#include <Adaptor3d_HSurfaceTool.hxx>
7fd59977	24
7fd59977	25	Contap_SurfFunction::Contap_SurfFunction ():
e2065c2f	26	myMean(1.),
	27	myType(Contap_ContourStd),
	28	myDir(0.,0.,1.),
	29	myCosAng(0.), // PI/2 - Angle de depouille
	30	tol(1.e-6),
	31	computed(Standard_False),
	32	derived(Standard_False)
7fd59977	33	{}
7fd59977	34
e2065c2f	35	void Contap_SurfFunction::Set(const Handle(Adaptor3d_HSurface)& S)
7fd59977	36	{
	37	mySurf = S;
	38	Standard_Integer i;
e2065c2f	39	Standard_Integer nbs = Contap_HContTool::NbSamplePoints(S);
7fd59977	40	Standard_Real U,V;
	41	gp_Vec norm;
	42	if (nbs > 0) {
	43	myMean = 0.;
	44	for (i = 1; i <= nbs; i++) {
e2065c2f	45	Contap_HContTool::SamplePoint(S,i,U,V);
	46	// Adaptor3d_HSurfaceTool::D1(S,U,V,solpt,d1u,d1v);
	47	// myMean = myMean + d1u.Crossed(d1v).Magnitude();
	48	Contap_SurfProps::Normale(S,U,V,solpt,norm);
7fd59977	49	myMean = myMean + norm.Magnitude();
	50	}
	51	myMean = myMean / ((Standard_Real)nbs);
	52	}
	53	computed = Standard_False;
	54	derived = Standard_False;
	55	}
	56
	57
	58	Standard_Integer Contap_SurfFunction::NbVariables () const
	59	{
	60	return 2;
	61	}
	62
	63	Standard_Integer Contap_SurfFunction::NbEquations () const
	64	{
	65	return 1;
	66	}
	67
	68
	69	Standard_Boolean Contap_SurfFunction::Value(const math_Vector& X,
e2065c2f	70	math_Vector& F)
7fd59977	71	{
7fd59977	72	Usol = X(1); Vsol = X(2);
e2065c2f	73	// Adaptor3d_HSurfaceTool::D1(mySurf,Usol,Vsol,solpt,d1u,d1v);
e2065c2f	74	// gp_Vec norm(d1u.Crossed(d1v));
7fd59977	75	gp_Vec norm;
e2065c2f	76	Contap_SurfProps::Normale(mySurf,Usol,Vsol,solpt,norm);
7fd59977	77	switch (myType) {
	78	case Contap_ContourStd:
	79	{
	80	F(1) = valf = (norm.Dot(myDir))/myMean;
	81	}
	82	break;
	83	case Contap_ContourPrs:
	84	{
	85	F(1) = valf = (norm.Dot(gp_Vec(myEye,solpt)))/myMean;
	86	}
	87	break;
	88	case Contap_DraftStd:
	89	{
	90	F(1) = valf = (norm.Dot(myDir)-myCosAng*norm.Magnitude())/myMean;
	91	}
	92	break;
	93	default:
	94	{
	95	}
	96	}
	97	computed = Standard_False;
	98	derived = Standard_False;
	99	return Standard_True;
	100	}
	101
	102
	103	Standard_Boolean Contap_SurfFunction::Derivatives(const math_Vector& X,
e2065c2f	104	math_Matrix& Grad)
7fd59977	105	{
e2065c2f	106	// gp_Vec d2u,d2v,d2uv;
7fd59977	107	Usol = X(1); Vsol = X(2);
e2065c2f	108	// Adaptor3d_HSurfaceTool::D2(mySurf,Usol,Vsol,solpt,d1u,d1v,d2u,d2v,d2uv);
7fd59977	109
7fd59977	110	gp_Vec norm,dnu,dnv;
e2065c2f	111	Contap_SurfProps::NormAndDn(mySurf,Usol,Vsol,solpt,norm,dnu,dnv);
7fd59977	112
	113	switch (myType) {
	114	case Contap_ContourStd:
	115	{
e2065c2f	116	// Grad(1,1) = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(myDir))/myMean;
e2065c2f	117	// Grad(1,2) = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(myDir))/myMean;
7fd59977	118	Grad(1,1) = (dnu.Dot(myDir))/myMean;
	119	Grad(1,2) = (dnv.Dot(myDir))/myMean;
	120	}
	121	break;
	122	case Contap_ContourPrs:
	123	{
	124	gp_Vec Ep(myEye,solpt);
	125	Grad(1,1) = (dnu.Dot(Ep))/myMean;
	126	Grad(1,2) = (dnv.Dot(Ep))/myMean;
	127	}
	128	break;
	129	case Contap_DraftStd:
	130	{
e2065c2f	131	// gp_Vec norm(d1u.Crossed(d1v).Normalized());
	132	// gp_Vec dnorm(d2u.Crossed(d1v) + d1u.Crossed(d2uv));
	133	// Grad(1,1) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
	134	// dnorm = d2uv.Crossed(d1v) + d1u.Crossed(d2v);
	135	// Grad(1,2) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
7fd59977	136	norm.Normalize();
	137	Grad(1,1) = (dnu.Dot(myDir)-myCosAng*dnu.Dot(norm))/myMean;
	138	Grad(1,2) = (dnv.Dot(myDir)-myCosAng*dnv.Dot(norm))/myMean;
	139	}
	140	break;
	141	case Contap_DraftPrs:
	142	default:
	143	{
	144	}
	145	}
	146	Fpu = Grad(1,1); Fpv = Grad(1,2);
	147	computed = Standard_False;
	148	derived = Standard_True;
	149	return Standard_True;
	150	}
	151
	152
	153	Standard_Boolean Contap_SurfFunction::Values (const math_Vector& X,
e2065c2f	154	math_Vector& F,
e2065c2f	155	math_Matrix& Grad)
7fd59977	156	{
e2065c2f	157	// gp_Vec d2u,d2v,d2uv;
7fd59977	158
7fd59977	159	Usol = X(1); Vsol = X(2);
e2065c2f	160	// Adaptor3d_HSurfaceTool::D2(mySurf,Usol,Vsol,solpt,d1u,d1v,d2u,d2v,d2uv);
e2065c2f	161	// gp_Vec norm(d1u.Crossed(d1v));
7fd59977	162	gp_Vec norm,dnu,dnv;
e2065c2f	163	Contap_SurfProps::NormAndDn(mySurf,Usol,Vsol,solpt,norm,dnu,dnv);
7fd59977	164
	165	switch (myType) {
	166
	167	case Contap_ContourStd:
	168	{
	169	F(1) = (norm.Dot(myDir))/myMean;
e2065c2f	170	// Grad(1,1) = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(myDir))/myMean;
e2065c2f	171	// Grad(1,2) = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(myDir))/myMean;
7fd59977	172	Grad(1,1) = (dnu.Dot(myDir))/myMean;
	173	Grad(1,2) = (dnv.Dot(myDir))/myMean;
	174	}
	175	break;
	176	case Contap_ContourPrs:
	177	{
	178	gp_Vec Ep(myEye,solpt);
	179	F(1) = (norm.Dot(Ep))/myMean;
e2065c2f	180	// Grad(1,1) = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(Ep))/myMean;
e2065c2f	181	// Grad(1,2) = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(Ep))/myMean;
7fd59977	182	Grad(1,1) = (dnu.Dot(Ep))/myMean;
	183	Grad(1,2) = (dnv.Dot(Ep))/myMean;
	184	}
	185	break;
	186	case Contap_DraftStd:
	187	{
	188	F(1) = (norm.Dot(myDir)-myCosAng*norm.Magnitude())/myMean;
	189	norm.Normalize();
e2065c2f	190	/*
7fd59977	191	gp_Vec dnorm(d2u.Crossed(d1v) + d1u.Crossed(d2uv));
	192	Grad(1,1) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
	193	dnorm = d2uv.Crossed(d1v) + d1u.Crossed(d2v);
	194	Grad(1,2) = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
e2065c2f	195	*/
7fd59977	196	Grad(1,1) = (dnu.Dot(myDir)-myCosAng*dnu.Dot(norm))/myMean;
	197	Grad(1,2) = (dnv.Dot(myDir)-myCosAng*dnv.Dot(norm))/myMean;
	198	}
	199	break;
	200	case Contap_DraftPrs:
	201	default:
	202	{
	203	}
	204	}
	205	valf = F(1);
	206	Fpu = Grad(1,1); Fpv = Grad(1,2);
	207	computed = Standard_False;
	208	derived = Standard_True;
	209	return Standard_True;
	210	}
	211
	212
	213	Standard_Boolean Contap_SurfFunction::IsTangent ()
	214	{
	215	if (!computed) {
	216	computed = Standard_True;
	217	if(!derived) {
e2065c2f	218	// gp_Vec d2u,d2v,d2uv;
e2065c2f	219	// Adaptor3d_HSurfaceTool::D2(mySurf, Usol, Vsol, solpt, d1u, d1v, d2u, d2v, d2uv);
7fd59977	220	gp_Vec norm,dnu,dnv;
e2065c2f	221	Contap_SurfProps::NormAndDn(mySurf,Usol,Vsol,solpt,norm,dnu,dnv);
7fd59977	222
	223	switch (myType) {
	224	case Contap_ContourStd:
e2065c2f	225	{
	226	// Fpu = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(myDir))/myMean;
	227	// Fpv = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(myDir))/myMean;
	228	Fpu = (dnu.Dot(myDir))/myMean;
	229	Fpv = (dnv.Dot(myDir))/myMean;
	230	}
	231	break;
7fd59977	232	case Contap_ContourPrs:
e2065c2f	233	{
	234	gp_Vec Ep(myEye,solpt);
	235	// Fpu = ((d2u.Crossed(d1v) + d1u.Crossed(d2uv)).Dot(Ep))/myMean;
	236	// Fpv = ((d2uv.Crossed(d1v) + d1u.Crossed(d2v)).Dot(Ep))/myMean;
	237	Fpu = (dnu.Dot(Ep))/myMean;
	238	Fpv = (dnv.Dot(Ep))/myMean;
	239	}
	240	break;
7fd59977	241	case Contap_DraftStd:
e2065c2f	242	{
	243	/*
	244	gp_Vec norm(d1u.Crossed(d1v).Normalized());
	245	gp_Vec dnorm(d2u.Crossed(d1v) + d1u.Crossed(d2uv));
	246	Fpu = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
	247	dnorm = d2uv.Crossed(d1v) + d1u.Crossed(d2v);
	248	Fpv = (dnorm.Dot(myDir)-myCosAng*dnorm.Dot(norm))/myMean;
	249	*/
	250	norm.Normalize();
	251	Fpu = (dnu.Dot(myDir)-myCosAng*dnu.Dot(norm))/myMean;
	252	Fpv = (dnv.Dot(myDir)-myCosAng*dnv.Dot(norm))/myMean;
	253	}
	254	break;
7fd59977	255	case Contap_DraftPrs:
7fd59977	256	default:
e2065c2f	257	{
e2065c2f	258	}
7fd59977	259	}
	260	derived = Standard_True;
	261	}
	262	tangent = Standard_False;
	263	Standard_Real D = Sqrt (Fpu * Fpu + Fpv * Fpv);
	264
	265	if (D <= gp::Resolution()) {
	266	tangent = Standard_True;
	267	}
	268	else {
	269	d2d = gp_Dir2d(-Fpv,Fpu);
	270	gp_Vec d1u,d1v;
e2065c2f	271	Adaptor3d_HSurfaceTool::D1(mySurf, Usol, Vsol, solpt, d1u, d1v); // ajout jag 02.95
7fd59977	272
	273	gp_XYZ d3dxyz(-Fpv*d1u.XYZ());
	274	d3dxyz.Add(Fpu*d1v.XYZ());
	275	d3d.SetXYZ(d3dxyz);
e2065c2f	276
7fd59977	277	//jag 940616 if (d3d.Magnitude() <= Tolpetit) {
7fd59977	278	if (d3d.Magnitude() <= tol) {
e2065c2f	279	tangent = Standard_True;
7fd59977	280	}
	281	}
	282	}
	283	return tangent;
	284	}