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193 lines
6.2 KiB
C++
193 lines
6.2 KiB
C++
// Created on: 2000-06-23
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// Created by: Sergey MOZOKHIN
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// Copyright (c) 2000-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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//=======================================================================
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#include <StlTransfer.ixx>
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#include <Standard_ErrorHandler.hxx>
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#include <Standard_Failure.hxx>
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#include <TopoDS_Face.hxx>
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#include <Poly_Connect.hxx>
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#include <TColgp_Array1OfDir.hxx>
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#include <Poly_Triangulation.hxx>
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#include <BRepAdaptor_Surface.hxx>
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#include <TopLoc_Location.hxx>
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#include <Geom_Surface.hxx>
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#include <BRep_Tool.hxx>
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#include <gp_Vec.hxx>
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#include <gp_Pnt.hxx>
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#include <CSLib.hxx>
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#include <TColgp_Array1OfPnt2d.hxx>
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#include <CSLib.hxx>
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#include <gp_Dir.hxx>
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#include <gp_XYZ.hxx>
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#include <BRepMesh_IncrementalMesh.hxx>
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#include <TopAbs.hxx>
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#include <Precision.hxx>
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#include <TopExp_Explorer.hxx>
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#include <TopoDS.hxx>
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#include <TColgp_SequenceOfXYZ.hxx>
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//function computes normals for surface
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static void Normal(const TopoDS_Face& aFace,
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Poly_Connect& pc,
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TColgp_Array1OfDir& Nor)
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{
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const Handle(Poly_Triangulation)& T = pc.Triangulation();
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BRepAdaptor_Surface S;
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Standard_Boolean hasUV = T->HasUVNodes();
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Standard_Integer i;
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TopLoc_Location l;
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Handle(Geom_Surface) GS = BRep_Tool::Surface(aFace, l);
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if (hasUV && !GS.IsNull()) {
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Standard_Boolean OK = Standard_True;
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gp_Vec D1U,D1V;
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gp_Vec D2U,D2V,D2UV;
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gp_Pnt P;
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Standard_Real U, V;
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CSLib_DerivativeStatus Status;
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CSLib_NormalStatus NStat;
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S.Initialize(aFace, Standard_False);
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const TColgp_Array1OfPnt2d& UVNodes = T->UVNodes();
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if (S.GetType() != GeomAbs_Plane) {
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for (i = UVNodes.Lower(); i <= UVNodes.Upper(); i++) {
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U = UVNodes(i).X();
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V = UVNodes(i).Y();
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S.D1(U,V,P,D1U,D1V);
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CSLib::Normal(D1U,D1V,Precision::Angular(),Status,Nor(i));
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if (Status != CSLib_Done) {
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S.D2(U,V,P,D1U,D1V,D2U,D2V,D2UV);
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CSLib::Normal(D1U,D1V,D2U,D2V,D2UV,Precision::Angular(),OK,NStat,Nor(i));
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}
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if (aFace.Orientation() == TopAbs_REVERSED) (Nor(i)).Reverse();
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}
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}
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else {
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gp_Dir NPlane;
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U = UVNodes(UVNodes.Lower()).X();
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V = UVNodes(UVNodes.Lower()).Y();
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S.D1(U,V,P,D1U,D1V);
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CSLib::Normal(D1U,D1V,Precision::Angular(),Status,NPlane);
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if (Status != CSLib_Done) {
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S.D2(U,V,P,D1U,D1V,D2U,D2V,D2UV);
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CSLib::Normal(D1U,D1V,D2U,D2V,D2UV,Precision::Angular(),OK,NStat,NPlane);
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}
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if (aFace.Orientation() == TopAbs_REVERSED) NPlane.Reverse();
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Nor.Init(NPlane);
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}
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}
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else {
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const TColgp_Array1OfPnt& Nodes = T->Nodes();
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Standard_Integer n[3];
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const Poly_Array1OfTriangle& triangles = T->Triangles();
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for (i = Nodes.Lower(); i <= Nodes.Upper(); i++) {
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gp_XYZ eqPlan(0, 0, 0);
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for (pc.Initialize(i); pc.More(); pc.Next()) {
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triangles(pc.Value()).Get(n[0], n[1], n[2]);
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gp_XYZ v1(Nodes(n[1]).Coord()-Nodes(n[0]).Coord());
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gp_XYZ v2(Nodes(n[2]).Coord()-Nodes(n[1]).Coord());
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eqPlan += (v1^v2).Normalized();
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}
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Nor(i) = gp_Dir(eqPlan);
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if (aFace.Orientation() == TopAbs_REVERSED) (Nor(i)).Reverse();
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}
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}
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}
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void StlTransfer::BuildIncrementalMesh (const TopoDS_Shape& Shape,
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const Standard_Real Deflection,
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const Standard_Boolean InParallel,
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const Handle(StlMesh_Mesh)& Mesh)
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{
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if (Deflection <= Precision::Confusion ()) {
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Standard_ConstructionError::Raise ("StlTransfer::BuildIncrementalMesh");
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}
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BRepMesh_IncrementalMesh aMesher(Shape, Deflection, Standard_False, 0.5, InParallel);
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for (TopExp_Explorer itf(Shape,TopAbs_FACE); itf.More(); itf.Next()) {
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TopoDS_Face face = TopoDS::Face(itf.Current());
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TopLoc_Location Loc, loc;
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Handle(Poly_Triangulation) theTriangulation = BRep_Tool::Triangulation(face, Loc);
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if (theTriangulation.IsNull()) continue; //Meshing was not done for this face!
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Poly_Array1OfTriangle theTriangles(1,theTriangulation->NbTriangles());
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theTriangles.Assign(theTriangulation->Triangles());
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Mesh->AddDomain (Deflection);
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TColgp_Array1OfPnt thePoints(1, theTriangulation->NbNodes());
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thePoints.Assign(theTriangulation->Nodes());
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//compute normal of face
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const TColgp_Array1OfPnt& Nodes = theTriangulation->Nodes();
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TColgp_Array1OfDir NORMAL(Nodes.Lower(), Nodes.Upper());
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Poly_Connect pc(theTriangulation);
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Normal(face, pc, NORMAL);
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Standard_Integer i;
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for(i=1;i<=thePoints.Length();i++) {
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Standard_Real X1, Y1, Z1;
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gp_Pnt p = thePoints.Value(i);
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p.Transform(Loc.Transformation());
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p.Coord (X1, Y1, Z1);
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Mesh->AddVertex (X1, Y1, Z1);
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}
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try {
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OCC_CATCH_SIGNALS
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for (i=1;i<=theTriangles.Length();i++) {
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Standard_Integer V1, V2, V3;
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Poly_Triangle triangle = theTriangles.Value(i);
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triangle.Get(V1, V2, V3);
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gp_Pnt P1, P2, P3;
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P1 = Mesh->Vertices(Mesh->NbDomains()).Value(V1);
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P2 = Mesh->Vertices(Mesh->NbDomains()).Value(V2);
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P3 = Mesh->Vertices(Mesh->NbDomains()).Value(V3);
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gp_Vec average = NORMAL(V1);;
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//check angle between vectors
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gp_Vec V1V2(P1, P2), V2V3(P2, P3);
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Standard_Integer A,B,C;
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gp_Vec vec = V1V2^V2V3;
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Standard_Real modul1, modul2;
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modul1 = average.XYZ().Modulus();
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modul2 = vec.XYZ().Modulus();
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if (modul2>Precision::Confusion ()) vec.Divide(modul2);
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A=V1;B=V2;C=V3;
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// vec.Transform(loc);
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if (modul1>Precision::Confusion () && modul2>Precision::Confusion ()) {
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Standard_Real an = vec.Angle(average);
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if ( an > M_PI/2) {
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A = V3;B=V2;C=V1;
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}
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else {
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A=V1;B=V2;C=V3;
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}
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}
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Mesh->AddTriangle (A, B, C, average.X(), average.Y(), average.Z());
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}
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}
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catch(Standard_Failure)
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{
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#ifdef DEB
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cout << "Fail in StlTransfer::BuildIncrementalMesh" << endl;
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#endif
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}
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}
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}
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