// Created on: 1993-01-21 // Created by: Remi LEQUETTE // 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. #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //======================================================================= //function : UVBounds //purpose : //======================================================================= void BRepTools::UVBounds(const TopoDS_Face& F, Standard_Real& UMin, Standard_Real& UMax, Standard_Real& VMin, Standard_Real& VMax) { Bnd_Box2d B; AddUVBounds(F,B); B.Get(UMin,VMin,UMax,VMax); } //======================================================================= //function : UVBounds //purpose : //======================================================================= void BRepTools::UVBounds(const TopoDS_Face& F, const TopoDS_Wire& W, Standard_Real& UMin, Standard_Real& UMax, Standard_Real& VMin, Standard_Real& VMax) { Bnd_Box2d B; AddUVBounds(F,W,B); B.Get(UMin,VMin,UMax,VMax); } //======================================================================= //function : UVBounds //purpose : //======================================================================= void BRepTools::UVBounds(const TopoDS_Face& F, const TopoDS_Edge& E, Standard_Real& UMin, Standard_Real& UMax, Standard_Real& VMin, Standard_Real& VMax) { Bnd_Box2d B; AddUVBounds(F,E,B); B.Get(UMin,VMin,UMax,VMax); } //======================================================================= //function : AddUVBounds //purpose : //======================================================================= void BRepTools::AddUVBounds(const TopoDS_Face& FF, Bnd_Box2d& B) { TopoDS_Face F = FF; F.Orientation(TopAbs_FORWARD); TopExp_Explorer ex(F,TopAbs_EDGE); // fill box for the given face Bnd_Box2d aBox; for (;ex.More();ex.Next()) { BRepTools::AddUVBounds(F,TopoDS::Edge(ex.Current()),aBox); } // if the box is empty (face without edges or without pcurves), // get natural bounds if (aBox.IsVoid()) { Standard_Real UMin,UMax,VMin,VMax; TopLoc_Location L; BRep_Tool::Surface(F,L)->Bounds(UMin,UMax,VMin,VMax); aBox.Update(UMin,VMin,UMax,VMax); } // add face box to result B.Add ( aBox ); } //======================================================================= //function : AddUVBounds //purpose : //======================================================================= void BRepTools::AddUVBounds(const TopoDS_Face& F, const TopoDS_Wire& W, Bnd_Box2d& B) { TopExp_Explorer ex; for (ex.Init(W,TopAbs_EDGE);ex.More();ex.Next()) { BRepTools::AddUVBounds(F,TopoDS::Edge(ex.Current()),B); } } //======================================================================= //function : AddUVBounds //purpose : //======================================================================= void BRepTools::AddUVBounds(const TopoDS_Face& aF, const TopoDS_Edge& aE, Bnd_Box2d& aB) { Standard_Real aT1, aT2, aXmin, aYmin, aXmax, aYmax; Standard_Real aUmin, aUmax, aVmin, aVmax; Bnd_Box2d aBoxC, aBoxS; TopLoc_Location aLoc; // const Handle(Geom2d_Curve) aC2D = BRep_Tool::CurveOnSurface(aE, aF, aT1, aT2); if (aC2D.IsNull()) { return; } // BndLib_Add2dCurve::Add(aC2D, aT1, aT2, 0., aBoxC); aBoxC.Get(aXmin, aYmin, aXmax, aYmax); // Handle(Geom_Surface) aS = BRep_Tool::Surface(aF, aLoc); aS->Bounds(aUmin, aUmax, aVmin, aVmax); if(aS->DynamicType() == STANDARD_TYPE(Geom_RectangularTrimmedSurface)) { const Handle(Geom_RectangularTrimmedSurface) aSt = Handle(Geom_RectangularTrimmedSurface)::DownCast(aS); aS = aSt->BasisSurface(); } // if(!aS->IsUPeriodic()) { Standard_Boolean isUPeriodic = Standard_False; // Additional verification for U-periodicity for B-spline surfaces // 1. Verify that the surface is U-closed (if such flag is false). Verification uses 2 points // 2. Verify periodicity of surface inside UV-bounds of the edge. Verification uses 3 or 6 points. if (aS->DynamicType() == STANDARD_TYPE(Geom_BSplineSurface) && (aXmin < aUmin || aXmax > aUmax)) { Standard_Real aTol2 = 100 * Precision::Confusion() * Precision::Confusion(); isUPeriodic = Standard_True; gp_Pnt P1, P2; // 1. Verify that the surface is U-closed if (!aS->IsUClosed()) { Standard_Real aVStep = aVmax - aVmin; for (Standard_Real aV = aVmin; aV <= aVmax; aV += aVStep) { P1 = aS->Value(aUmin, aV); P2 = aS->Value(aUmax, aV); if (P1.SquareDistance(P2) > aTol2) { isUPeriodic = Standard_False; break; } } } // 2. Verify periodicity of surface inside UV-bounds of the edge if (isUPeriodic) // the flag still not changed { Standard_Real aV = (aVmin + aVmax) * 0.5; Standard_Real aU[6]; // values of U lying out of surface boundaries Standard_Real aUpp[6]; // corresponding U-values plus/minus period Standard_Integer aNbPnt = 0; if (aXmin < aUmin) { aU[0] = aXmin; aU[1] = (aXmin + aUmin) * 0.5; aU[2] = aUmin; aUpp[0] = aU[0] + aUmax - aUmin; aUpp[1] = aU[1] + aUmax - aUmin; aUpp[2] = aU[2] + aUmax - aUmin; aNbPnt += 3; } if (aXmax > aUmax) { aU[aNbPnt] = aUmax; aU[aNbPnt + 1] = (aXmax + aUmax) * 0.5; aU[aNbPnt + 2] = aXmax; aUpp[aNbPnt] = aU[aNbPnt] - aUmax + aUmin; aUpp[aNbPnt + 1] = aU[aNbPnt + 1] - aUmax + aUmin; aUpp[aNbPnt + 2] = aU[aNbPnt + 2] - aUmax + aUmin; aNbPnt += 3; } for (Standard_Integer anInd = 0; anInd < aNbPnt; anInd++) { P1 = aS->Value(aU[anInd], aV); P2 = aS->Value(aUpp[anInd], aV); if (P1.SquareDistance(P2) > aTol2) { isUPeriodic = Standard_False; break; } } } } if (!isUPeriodic) { if((aXminIsVPeriodic()) { Standard_Boolean isVPeriodic = Standard_False; // Additional verification for V-periodicity for B-spline surfaces // 1. Verify that the surface is V-closed (if such flag is false). Verification uses 2 points // 2. Verify periodicity of surface inside UV-bounds of the edge. Verification uses 3 or 6 points. if (aS->DynamicType() == STANDARD_TYPE(Geom_BSplineSurface) && (aYmin < aVmin || aYmax > aVmax)) { Standard_Real aTol2 = 100 * Precision::Confusion() * Precision::Confusion(); isVPeriodic = Standard_True; gp_Pnt P1, P2; // 1. Verify that the surface is V-closed if (!aS->IsVClosed()) { Standard_Real aUStep = aUmax - aUmin; for (Standard_Real aU = aUmin; aU <= aUmax; aU += aUStep) { P1 = aS->Value(aU, aVmin); P2 = aS->Value(aU, aVmax); if (P1.SquareDistance(P2) > aTol2) { isVPeriodic = Standard_False; break; } } } // 2. Verify periodicity of surface inside UV-bounds of the edge if (isVPeriodic) // the flag still not changed { Standard_Real aU = (aUmin + aUmax) * 0.5; Standard_Real aV[6]; // values of V lying out of surface boundaries Standard_Real aVpp[6]; // corresponding V-values plus/minus period Standard_Integer aNbPnt = 0; if (aYmin < aVmin) { aV[0] = aYmin; aV[1] = (aYmin + aVmin) * 0.5; aV[2] = aVmin; aVpp[0] = aV[0] + aVmax - aVmin; aVpp[1] = aV[1] + aVmax - aVmin; aVpp[2] = aV[2] + aVmax - aVmin; aNbPnt += 3; } if (aYmax > aVmax) { aV[aNbPnt] = aVmax; aV[aNbPnt + 1] = (aYmax + aVmax) * 0.5; aV[aNbPnt + 2] = aYmax; aVpp[aNbPnt] = aV[aNbPnt] - aVmax + aVmin; aVpp[aNbPnt + 1] = aV[aNbPnt + 1] - aVmax + aVmin; aVpp[aNbPnt + 2] = aV[aNbPnt + 2] - aVmax + aVmin; aNbPnt += 3; } for (Standard_Integer anInd = 0; anInd < aNbPnt; anInd++) { P1 = aS->Value(aU, aV[anInd]); P2 = aS->Value(aU, aVpp[anInd]); if (P1.SquareDistance(P2) > aTol2) { isVPeriodic = Standard_False; break; } } } } if (!isVPeriodic) { if((aYminChecked(Standard_True); } } //======================================================================= //function : Update //purpose : //======================================================================= void BRepTools::Update(const TopoDS_Shell& S) { TopExp_Explorer ex(S,TopAbs_FACE); while (ex.More()) { Update(TopoDS::Face(ex.Current())); ex.Next(); } } //======================================================================= //function : Update //purpose : //======================================================================= void BRepTools::Update(const TopoDS_Solid& S) { TopExp_Explorer ex(S,TopAbs_FACE); while (ex.More()) { Update(TopoDS::Face(ex.Current())); ex.Next(); } } //======================================================================= //function : Update //purpose : //======================================================================= void BRepTools::Update(const TopoDS_CompSolid& CS) { TopExp_Explorer ex(CS,TopAbs_FACE); while (ex.More()) { Update(TopoDS::Face(ex.Current())); ex.Next(); } } //======================================================================= //function : Update //purpose : //======================================================================= void BRepTools::Update(const TopoDS_Compound& C) { TopExp_Explorer ex(C,TopAbs_FACE); while (ex.More()) { Update(TopoDS::Face(ex.Current())); ex.Next(); } } //======================================================================= //function : Update //purpose : //======================================================================= void BRepTools::Update(const TopoDS_Shape& S) { switch (S.ShapeType()) { case TopAbs_VERTEX : Update(TopoDS::Vertex(S)); break; case TopAbs_EDGE : Update(TopoDS::Edge(S)); break; case TopAbs_WIRE : Update(TopoDS::Wire(S)); break; case TopAbs_FACE : Update(TopoDS::Face(S)); break; case TopAbs_SHELL : Update(TopoDS::Shell(S)); break; case TopAbs_SOLID : Update(TopoDS::Solid(S)); break; case TopAbs_COMPSOLID : Update(TopoDS::CompSolid(S)); break; case TopAbs_COMPOUND : Update(TopoDS::Compound(S)); break; default: break; } } //======================================================================= //function : UpdateFaceUVPoints //purpose : reset the UV points of a Face //======================================================================= void BRepTools::UpdateFaceUVPoints(const TopoDS_Face& F) { // Recompute for each edge the two UV points in order to have the same // UV point on connected edges. // First edge loop, store the vertices in a Map with their 2d points BRepTools_MapOfVertexPnt2d theVertices; TopoDS_Iterator expE,expV; TopoDS_Iterator EdgeIt,VertIt; TColStd_SequenceOfReal aFSeq, aLSeq; TColGeom2d_SequenceOfCurve aCSeq; TopTools_SequenceOfShape aShSeq; gp_Pnt2d P; Standard_Integer i; // a 3d tolerance for UV !! Standard_Real tolerance = BRep_Tool::Tolerance(F); TColgp_SequenceOfPnt2d emptySequence; for (expE.Initialize(F); expE.More(); expE.Next()) { if(expE.Value().ShapeType() != TopAbs_WIRE) continue; EdgeIt.Initialize(expE.Value()); for( ; EdgeIt.More(); EdgeIt.Next()) { const TopoDS_Edge& E = TopoDS::Edge(EdgeIt.Value()); Standard_Real f,l; Handle(Geom2d_Curve) C = BRep_Tool::CurveOnSurface(E,F,f,l); aFSeq.Append(f); aLSeq.Append(l); aCSeq.Append(C); aShSeq.Append(E); if (C.IsNull()) continue; for (expV.Initialize(E.Oriented(TopAbs_FORWARD)); expV.More(); expV.Next()) { const TopoDS_Vertex& V = TopoDS::Vertex(expV.Value()); TopAbs_Orientation Vori = V.Orientation(); if ( Vori == TopAbs_INTERNAL ) { continue; } Standard_Real p = BRep_Tool::Parameter(V,E,F); C->D0(p,P); if (!theVertices.IsBound(V)) theVertices.Bind(V,emptySequence); TColgp_SequenceOfPnt2d& S = theVertices(V); for (i = 1; i <= S.Length(); i++) { if (P.Distance(S(i)) < tolerance) break; } if (i > S.Length()) S.Append(P); } } } // second edge loop, update the edges 2d points TopoDS_Vertex Vf,Vl; gp_Pnt2d Pf,Pl; for(Standard_Integer j = 1; j <= aShSeq.Length(); j++) { const TopoDS_Edge& E = TopoDS::Edge(aShSeq.Value(j)); const Handle(Geom2d_Curve)& C = aCSeq.Value(j); if (C.IsNull()) continue; TopExp::Vertices(E,Vf,Vl); if (Vf.IsNull()) { Pf.SetCoord(RealLast(),RealLast()); } else { if ( Vf.Orientation() == TopAbs_INTERNAL ) { continue; } const TColgp_SequenceOfPnt2d& seqf = theVertices(Vf); if (seqf.Length() == 1) Pf = seqf(1); else { C->D0(aFSeq.Value(j),Pf); for (i = 1; i <= seqf.Length(); i++) { if (Pf.Distance(seqf(i)) <= tolerance) { Pf = seqf(i); break; } } } } if (Vl.IsNull()) { Pl.SetCoord(RealLast(),RealLast()); } else { if ( Vl.Orientation() == TopAbs_INTERNAL ) { continue; } const TColgp_SequenceOfPnt2d& seql = theVertices(Vl); if (seql.Length() == 1) Pl = seql(1); else { C->D0(aLSeq.Value(j),Pl); for (i = 1; i <= seql.Length(); i++) { if (Pl.Distance(seql(i)) <= tolerance) { Pl = seql(i); break; } } } } // set the correct points BRep_Tool::SetUVPoints(E,F,Pf,Pl); } } //======================================================================= //function : Compare //purpose : //======================================================================= Standard_Boolean BRepTools::Compare(const TopoDS_Vertex& V1, const TopoDS_Vertex& V2) { if (V1.IsSame(V2)) return Standard_True; gp_Pnt p1 = BRep_Tool::Pnt(V1); gp_Pnt p2 = BRep_Tool::Pnt(V2); Standard_Real l = p1.Distance(p2); if (l <= BRep_Tool::Tolerance(V1)) return Standard_True; if (l <= BRep_Tool::Tolerance(V2)) return Standard_True; return Standard_False; } //======================================================================= //function : Compare //purpose : //======================================================================= Standard_Boolean BRepTools::Compare(const TopoDS_Edge& E1, const TopoDS_Edge& E2) { if (E1.IsSame(E2)) return Standard_True; return Standard_False; } //======================================================================= //function : OuterWire //purpose : //======================================================================= TopoDS_Wire BRepTools::OuterWire(const TopoDS_Face& F) { TopoDS_Wire Wres; TopExp_Explorer expw (F,TopAbs_WIRE); if (expw.More()) { Wres = TopoDS::Wire(expw.Current()); expw.Next(); if (expw.More()) { Standard_Real UMin, UMax, VMin, VMax; Standard_Real umin, umax, vmin, vmax; BRepTools::UVBounds(F,Wres,UMin,UMax,VMin,VMax); while (expw.More()) { const TopoDS_Wire& W = TopoDS::Wire(expw.Current()); BRepTools::UVBounds(F,W,umin, umax, vmin, vmax); if ((umin <= UMin) && (umax >= UMax) && (vmin <= VMin) && (vmax >= VMax)) { Wres = W; UMin = umin; UMax = umax; VMin = vmin; VMax = vmax; } expw.Next(); } } } return Wres; } //======================================================================= //function : Map3DEdges //purpose : //======================================================================= void BRepTools::Map3DEdges(const TopoDS_Shape& S, TopTools_IndexedMapOfShape& M) { TopExp_Explorer Ex; for (Ex.Init(S,TopAbs_EDGE); Ex.More(); Ex.Next()) { if (!BRep_Tool::Degenerated(TopoDS::Edge(Ex.Current()))) M.Add(Ex.Current()); } } //======================================================================= //function : Dump //purpose : //======================================================================= void BRepTools::Dump(const TopoDS_Shape& Sh, Standard_OStream& S) { BRepTools_ShapeSet SS; SS.Add(Sh); SS.Dump(Sh,S); SS.Dump(S); } //======================================================================= //function : Write //purpose : //======================================================================= void BRepTools::Write(const TopoDS_Shape& Sh, Standard_OStream& S, const Handle(Message_ProgressIndicator)& PR) { BRepTools_ShapeSet SS; SS.SetProgress(PR); SS.Add(Sh); SS.Write(S); SS.Write(Sh,S); } //======================================================================= //function : Read //purpose : //======================================================================= void BRepTools::Read(TopoDS_Shape& Sh, istream& S, const BRep_Builder& B, const Handle(Message_ProgressIndicator)& PR) { BRepTools_ShapeSet SS(B); SS.SetProgress(PR); SS.Read(S); SS.Read(Sh,S); } //======================================================================= //function : Write //purpose : //======================================================================= Standard_Boolean BRepTools::Write(const TopoDS_Shape& Sh, const Standard_CString File, const Handle(Message_ProgressIndicator)& PR) { ofstream os; OSD_OpenStream(os, File, ios::out); if (!os.rdbuf()->is_open()) return Standard_False; Standard_Boolean isGood = (os.good() && !os.eof()); if(!isGood) return isGood; BRepTools_ShapeSet SS; SS.SetProgress(PR); SS.Add(Sh); os << "DBRep_DrawableShape\n"; // for easy Draw read SS.Write(os); isGood = os.good(); if(isGood ) SS.Write(Sh,os); os.flush(); isGood = os.good(); errno = 0; os.close(); isGood = os.good() && isGood && !errno; return isGood; } //======================================================================= //function : Read //purpose : //======================================================================= Standard_Boolean BRepTools::Read(TopoDS_Shape& Sh, const Standard_CString File, const BRep_Builder& B, const Handle(Message_ProgressIndicator)& PR) { filebuf fic; istream in(&fic); OSD_OpenFileBuf(fic,File,ios::in); if(!fic.is_open()) return Standard_False; BRepTools_ShapeSet SS(B); SS.SetProgress(PR); SS.Read(in); if(!SS.NbShapes()) return Standard_False; SS.Read(Sh,in); return Standard_True; } //======================================================================= //function : Clean //purpose : //======================================================================= void BRepTools::Clean(const TopoDS_Shape& theShape) { BRep_Builder aBuilder; Handle(Poly_Triangulation) aNullTriangulation; Handle(Poly_PolygonOnTriangulation) aNullPoly; if (theShape.IsNull()) return; TopExp_Explorer aFaceIt(theShape, TopAbs_FACE); for (; aFaceIt.More(); aFaceIt.Next()) { const TopoDS_Face& aFace = TopoDS::Face(aFaceIt.Current()); TopLoc_Location aLoc; const Handle(Poly_Triangulation)& aTriangulation = BRep_Tool::Triangulation(aFace, aLoc); if (aTriangulation.IsNull()) continue; // Nullify edges TopExp_Explorer aEdgeIt(aFace, TopAbs_EDGE); for (; aEdgeIt.More(); aEdgeIt.Next()) { const TopoDS_Edge& aEdge = TopoDS::Edge(aEdgeIt.Current()); aBuilder.UpdateEdge(aEdge, aNullPoly, aTriangulation, aLoc); } aBuilder.UpdateFace(aFace, aNullTriangulation); } } //======================================================================= //function : RemoveUnusedPCurves //purpose : //======================================================================= void BRepTools::RemoveUnusedPCurves(const TopoDS_Shape& S) { TColStd_MapOfTransient UsedSurfaces; TopExp_Explorer Explo(S, TopAbs_FACE); for (; Explo.More(); Explo.Next()) { TopoDS_Face aFace = TopoDS::Face(Explo.Current()); TopLoc_Location aLoc; Handle(Geom_Surface) aSurf = BRep_Tool::Surface(aFace, aLoc); UsedSurfaces.Add(aSurf); } TopTools_IndexedMapOfShape Emap; TopExp::MapShapes(S, TopAbs_EDGE, Emap); Standard_Integer i; for (i = 1; i <= Emap.Extent(); i++) { const Handle(BRep_TEdge)& TE = *((Handle(BRep_TEdge)*) &Emap(i).TShape()); BRep_ListOfCurveRepresentation& lcr = TE -> ChangeCurves(); BRep_ListIteratorOfListOfCurveRepresentation itrep(lcr ); while (itrep.More()) { Standard_Boolean ToRemove = Standard_False; Handle(BRep_CurveRepresentation) CurveRep = itrep.Value(); if (CurveRep->IsCurveOnSurface()) { Handle(Geom_Surface) aSurface = CurveRep->Surface(); if (!UsedSurfaces.Contains(aSurface)) ToRemove = Standard_True; } else if (CurveRep->IsRegularity()) { Handle(Geom_Surface) Surf1 = CurveRep->Surface(); Handle(Geom_Surface) Surf2 = CurveRep->Surface2(); ToRemove = (!UsedSurfaces.Contains(Surf1) || !UsedSurfaces.Contains(Surf2)); } if (ToRemove) lcr.Remove(itrep); else itrep.Next(); } } } //======================================================================= //function : Triangulation //purpose : //======================================================================= Standard_Boolean BRepTools::Triangulation(const TopoDS_Shape& S, const Standard_Real deflec) { TopExp_Explorer exf, exe; TopLoc_Location l; Handle(Poly_Triangulation) T; Handle(Poly_PolygonOnTriangulation) Poly; for (exf.Init(S, TopAbs_FACE); exf.More(); exf.Next()) { const TopoDS_Face& F = TopoDS::Face(exf.Current()); T = BRep_Tool::Triangulation(F, l); if (T.IsNull() || (T->Deflection() > deflec)) return Standard_False; for (exe.Init(F, TopAbs_EDGE); exe.More(); exe.Next()) { const TopoDS_Edge& E = TopoDS::Edge(exe.Current()); Poly = BRep_Tool::PolygonOnTriangulation(E, T, l); if (Poly.IsNull()) return Standard_False; } } return Standard_True; } //======================================================================= //function : IsReallyClosed //purpose : //======================================================================= Standard_Boolean BRepTools::IsReallyClosed(const TopoDS_Edge& E, const TopoDS_Face& F) { if (!BRep_Tool::IsClosed(E,F)) { return Standard_False; } Standard_Integer nbocc = 0; TopExp_Explorer exp; for (exp.Init(F,TopAbs_EDGE);exp.More();exp.Next()) { if (exp.Current().IsSame(E)) { nbocc++; } } return nbocc == 2; } //======================================================================= //function : EvalAndUpdateTol //purpose : //======================================================================= Standard_Real BRepTools::EvalAndUpdateTol(const TopoDS_Edge& theE, const Handle(Geom_Curve)& C3d, const Handle(Geom2d_Curve) C2d, const Handle(Geom_Surface)& S, const Standard_Real f, const Standard_Real l) { Standard_Real newtol = 0.; Standard_Real first = f, last = l; //Set first, last to avoid ErrosStatus = 2 because of //too strong checking of limits in class CheckCurveOnSurface // if(!C3d->IsPeriodic()) { first = Max(first, C3d->FirstParameter()); last = Min(last, C3d->LastParameter()); } if(!C2d->IsPeriodic()) { first = Max(first, C2d->FirstParameter()); last = Min(last, C2d->LastParameter()); } GeomLib_CheckCurveOnSurface CT(C3d, S, first, last); CT.Perform(C2d); if(CT.IsDone()) { newtol = CT.MaxDistance(); } else { if(CT.ErrorStatus() == 3 || (CT.ErrorStatus() == 2 && (C3d->IsPeriodic() || C2d->IsPeriodic()))) { //Try to estimate by sample points Standard_Integer nbint = 22; Standard_Real dt = (last - first) / nbint; dt = Max(dt, Precision::Confusion()); Standard_Real d, dmax = 0.; gp_Pnt2d aP2d; gp_Pnt aPC, aPS; Standard_Integer cnt = 0; Standard_Real t = first; for(; t <= last; t += dt) { cnt++; C2d->D0(t, aP2d); C3d->D0(t, aPC); S->D0(aP2d.X(), aP2d.Y(), aPS); d = aPS.SquareDistance(aPC); if(d > dmax) { dmax = d; } } if(cnt < nbint + 1) { t = last; C2d->D0(t, aP2d); C3d->D0(t, aPC); S->D0(aP2d.X(), aP2d.Y(), aPS); d = aPS.SquareDistance(aPC); if(d > dmax) { dmax = d; } } newtol = 1.2 * Sqrt(dmax); } } Standard_Real Tol = BRep_Tool::Tolerance(theE); if(newtol > Tol) { Tol = newtol; BRep_Builder B; B.UpdateEdge(theE, Tol); } return Tol; }