1 // Created on: 2014-08-13
2 // Created by: Oleg AGASHIN
3 // Copyright (c) 2011-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #include <BRepMesh_EdgeTessellator.hxx>
17 #include <Geom_Surface.hxx>
18 #include <Geom_Plane.hxx>
19 #include <Geom2d_Curve.hxx>
20 #include <TopoDS_Edge.hxx>
21 #include <TopoDS_Face.hxx>
22 #include <BRepAdaptor_HSurface.hxx>
23 #include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
24 #include <TopLoc_Location.hxx>
25 #include <BRep_Tool.hxx>
26 #include <TColStd_Array1OfReal.hxx>
27 #include <TopExp_Explorer.hxx>
28 #include <TopoDS_Vertex.hxx>
30 #include <TopTools_ListIteratorOfListOfShape.hxx>
31 #include <TopTools_ListOfShape.hxx>
32 #include <TColStd_Array1OfReal.hxx>
35 IMPLEMENT_STANDARD_RTTIEXT(BRepMesh_EdgeTessellator,BRepMesh_IEdgeTool)
37 //=======================================================================
38 //function : Constructor
40 //=======================================================================
41 BRepMesh_EdgeTessellator::BRepMesh_EdgeTessellator(
42 const TopoDS_Edge& theEdge,
43 const Handle(BRepMesh_FaceAttribute)& theFaceAttribute,
44 const TopTools_IndexedDataMapOfShapeListOfShape& theMapOfSharedFaces,
45 const Standard_Real theLinDeflection,
46 const Standard_Real theAngDeflection,
47 const Standard_Real theMinSize)
48 : mySurface(theFaceAttribute->Surface())
50 Standard_Real aPreciseAngDef = 0.5 * theAngDeflection;
51 Standard_Real aPreciseLinDef = 0.5 * theLinDeflection;
52 if (theEdge.Orientation() == TopAbs_INTERNAL)
53 aPreciseLinDef *= 0.5;
55 mySquareEdgeDef = aPreciseLinDef * aPreciseLinDef;
56 mySquareMinSize = Max(mySquareEdgeDef, theMinSize * theMinSize);
57 myEdgeSqTol = BRep_Tool::Tolerance (theEdge);
58 myEdgeSqTol *= myEdgeSqTol;
60 Standard_Boolean isSameParam = BRep_Tool::SameParameter(theEdge);
62 myCOnS.Initialize(theEdge);
64 myCOnS.Initialize(theEdge, theFaceAttribute->Face());
66 const GeomAbs_CurveType aCurveType = myCOnS.GetType();
67 Standard_Integer aMinPntNb = (aCurveType == GeomAbs_Circle) ? 4 : 2; //OCC287
69 // Get range on 2d curve
70 Standard_Real aFirstParam, aLastParam;
71 BRep_Tool::Range(theEdge, theFaceAttribute->Face(), aFirstParam, aLastParam);
72 myTool = new BRepMesh_GeomTool(myCOnS, aFirstParam, aLastParam,
73 aPreciseLinDef, aPreciseAngDef, aMinPntNb, theMinSize);
75 if (aCurveType == GeomAbs_BSplineCurve)
78 const Standard_Integer aNbInt = myCOnS.NbIntervals(GeomAbs_C1);
81 TColStd_Array1OfReal anIntervals( 1, aNbInt + 1 );
82 myCOnS.Intervals(anIntervals, GeomAbs_C1);
83 for (Standard_Integer aIntIt = 1; aIntIt <= aNbInt; ++aIntIt)
85 const Standard_Real& aStartInt = anIntervals.Value( aIntIt );
86 const Standard_Real& anEndInt = anIntervals.Value( aIntIt + 1 );
88 BRepMesh_GeomTool aDetalizator(myCOnS, aStartInt, anEndInt,
89 aPreciseLinDef, aPreciseAngDef, aMinPntNb, theMinSize);
91 Standard_Integer aNbAddNodes = aDetalizator.NbPoints();
92 for ( Standard_Integer aNodeIt = 1; aNodeIt <= aNbAddNodes; ++aNodeIt )
97 aDetalizator.Value( aNodeIt, mySurface, aParam, aPoint3d, aPoint2d );
98 myTool->AddPoint( aPoint3d, aParam, Standard_False );
104 // PTv, chl/922/G9, Take into account internal vertices
105 // it is necessary for internal edges, which do not split other edges, by their vertex
106 TopExp_Explorer aVertexIt(theEdge, TopAbs_VERTEX);
107 for (; aVertexIt.More(); aVertexIt.Next())
109 const TopoDS_Vertex& aVertex = TopoDS::Vertex(aVertexIt.Current());
110 if (aVertex.Orientation() != TopAbs_INTERNAL)
113 myTool->AddPoint(BRep_Tool::Pnt(aVertex),
114 BRep_Tool::Parameter(aVertex, theEdge), Standard_True);
117 Standard_Integer aNodesNb = myTool->NbPoints();
118 //Check deflection in 2d space for improvement of edge tesselation.
119 if( isSameParam && aNodesNb > 1)
121 const TopTools_ListOfShape& aSharedFaces = theMapOfSharedFaces.FindFromKey(theEdge);
122 TopTools_ListIteratorOfListOfShape aFaceIt(aSharedFaces);
123 for (; aFaceIt.More(); aFaceIt.Next())
125 TopLoc_Location aLoc;
126 const TopoDS_Face& aFace = TopoDS::Face(aFaceIt.Value());
127 Handle(Geom_Surface) aSurf = BRep_Tool::Surface(aFace, aLoc);
129 if (aSurf->IsInstance(STANDARD_TYPE(Geom_Plane)))
132 Standard_Real aF, aL;
133 Handle(Geom2d_Curve) aCurve2d = BRep_Tool::CurveOnSurface(theEdge, aFace, aF, aL);
134 if ( Abs(aF - aFirstParam) > Precision::PConfusion() ||
135 Abs(aL - aLastParam ) > Precision::PConfusion() )
140 aNodesNb = myTool->NbPoints();
141 TColStd_Array1OfReal aParamArray(1, aNodesNb);
142 for (Standard_Integer i = 1; i <= aNodesNb; ++i)
146 Standard_Real aParam;
147 myTool->Value(i, mySurface, aParam, aTmpPnt, aTmpUV);
148 aParamArray.SetValue(i, aParam);
151 for (Standard_Integer i = 1; i < aNodesNb; ++i)
152 splitSegment(aSurf, aCurve2d, aParamArray(i), aParamArray(i + 1), 1);
156 const Standard_Real aTol = Precision::Confusion();
157 const Standard_Real aDu = mySurface->UResolution (aTol);
158 const Standard_Real aDv = mySurface->VResolution (aTol);
160 myFaceRangeU[0] = mySurface->FirstUParameter() - aDu;
161 myFaceRangeU[1] = mySurface->LastUParameter() + aDu;
163 myFaceRangeV[0] = mySurface->FirstVParameter() - aDv;
164 myFaceRangeV[1] = mySurface->LastVParameter() + aDv;
167 //=======================================================================
170 //=======================================================================
171 Standard_Boolean BRepMesh_EdgeTessellator::Value(
172 const Standard_Integer theIndex,
173 Standard_Real& theParameter,
177 myTool->Value(theIndex, mySurface, theParameter, thePoint, theUV);
179 // If point coordinates are out of surface range,
180 // it is necessary to re-project point.
181 if (mySurface->GetType() != GeomAbs_BSplineSurface &&
182 mySurface->GetType() != GeomAbs_BezierSurface &&
183 mySurface->GetType() != GeomAbs_OtherSurface)
185 return Standard_True;
188 // Let skip periodic case.
189 if (mySurface->IsUPeriodic() || mySurface->IsVPeriodic())
190 return Standard_True;
192 // Point lies within the surface range - nothing to do.
193 if (theUV.X() > myFaceRangeU[0] && theUV.X() < myFaceRangeU[1] &&
194 theUV.Y() > myFaceRangeV[0] && theUV.Y() < myFaceRangeV[1])
196 return Standard_True;
200 mySurface->D0 (theUV.X (), theUV.Y (), aPntOnSurf);
202 return (thePoint.SquareDistance (aPntOnSurf) < myEdgeSqTol);
205 //=======================================================================
206 //function : splitSegment
208 //=======================================================================
209 void BRepMesh_EdgeTessellator::splitSegment(
210 const Handle(Geom_Surface)& theSurf,
211 const Handle(Geom2d_Curve)& theCurve2d,
212 const Standard_Real theFirst,
213 const Standard_Real theLast,
214 const Standard_Integer theNbIter)
216 // limit iteration depth
220 gp_Pnt2d uvf, uvl, uvm;
221 gp_Pnt P3dF, P3dL, midP3d, midP3dFromSurf;
222 Standard_Real midpar;
224 if(Abs(theLast - theFirst) < 2 * Precision::PConfusion())
227 theCurve2d->D0(theFirst, uvf);
228 theCurve2d->D0(theLast, uvl);
230 P3dF = theSurf->Value(uvf.X(), uvf.Y());
231 P3dL = theSurf->Value(uvl.X(), uvl.Y());
233 if(P3dF.SquareDistance(P3dL) < mySquareMinSize)
236 uvm = gp_Pnt2d((uvf.XY() + uvl.XY())*0.5);
237 midP3dFromSurf = theSurf->Value(uvm.X(), uvm.Y());
239 gp_XYZ Vec1 = midP3dFromSurf.XYZ() - P3dF.XYZ();
240 if(Vec1.SquareModulus() < mySquareMinSize)
243 gp_XYZ aVec = P3dL.XYZ() - P3dF.XYZ();
246 Standard_Real aModulus = Vec1.Dot(aVec);
247 gp_XYZ aProj = aVec * aModulus;
248 gp_XYZ aDist = Vec1 - aProj;
250 if(aDist.SquareModulus() < mySquareEdgeDef)
253 midpar = (theFirst + theLast) * 0.5;
254 myCOnS.D0(midpar, midP3d);
255 myTool->AddPoint(midP3d, midpar, Standard_False);
257 splitSegment(theSurf, theCurve2d, theFirst, midpar, theNbIter + 1);
258 splitSegment(theSurf, theCurve2d, midpar, theLast, theNbIter + 1);