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https://github.com/Open-Cascade-SAS/OCCT.git
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4178b3531b
STL Reader and Writer tools have been refactored to improve performance and usability: - Basic reading of STL file is separated to abstract class RWStl_Reader which is not bound to particular data structures; the target data model can be bound via inheritance. - RWStl package uses class Poly_Triangulation to represent triangular mesh. - Obsolete data structures and tools (packages StlMesh and StlTransfer) are removed.
97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
// Copyright (c) 1999-2014 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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#include <StlAPI_Reader.hxx>
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#include <BRep_Builder.hxx>
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#include <BRepBuilderAPI_MakeFace.hxx>
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#include <BRepBuilderAPI_MakePolygon.hxx>
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#include <BRepBuilderAPI_MakeVertex.hxx>
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#include <BRepBuilderAPI_Sewing.hxx>
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#include <gp_Pnt.hxx>
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#include <OSD_Path.hxx>
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#include <RWStl.hxx>
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#include <TopoDS_Compound.hxx>
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#include <TopoDS_Edge.hxx>
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#include <TopoDS_Face.hxx>
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#include <TopoDS_Shape.hxx>
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#include <TopoDS_Shell.hxx>
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#include <TopoDS_Vertex.hxx>
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#include <TopoDS_Wire.hxx>
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//=============================================================================
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//function : Read
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//purpose :
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//=============================================================================
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Standard_Boolean StlAPI_Reader::Read (TopoDS_Shape& theShape,
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const Standard_CString theFileName)
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{
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Handle(Poly_Triangulation) aMesh = RWStl::ReadFile (theFileName);
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if (aMesh.IsNull())
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{
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return Standard_False;
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}
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TopoDS_Vertex aTriVertexes[3];
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TopoDS_Face aFace;
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TopoDS_Wire aWire;
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BRepBuilderAPI_Sewing aSewingTool;
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aSewingTool.Init (1.0e-06, Standard_True);
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TopoDS_Compound aComp;
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BRep_Builder BuildTool;
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BuildTool.MakeCompound (aComp);
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const TColgp_Array1OfPnt& aNodes = aMesh->Nodes();
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const Poly_Array1OfTriangle& aTriangles = aMesh->Triangles();
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for (Standard_Integer aTriIdx = aTriangles.Lower();
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aTriIdx <= aTriangles.Upper();
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++aTriIdx)
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{
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const Poly_Triangle& aTriangle = aTriangles(aTriIdx);
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Standard_Integer anId[3];
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aTriangle.Get(anId[0], anId[1], anId[2]);
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const gp_Pnt& aPnt1 = aNodes (anId[0]);
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const gp_Pnt& aPnt2 = aNodes (anId[1]);
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const gp_Pnt& aPnt3 = aNodes (anId[2]);
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if ((!(aPnt1.IsEqual (aPnt2, 0.0)))
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&& (!(aPnt1.IsEqual (aPnt3, 0.0))))
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{
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aTriVertexes[0] = BRepBuilderAPI_MakeVertex (aPnt1);
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aTriVertexes[1] = BRepBuilderAPI_MakeVertex (aPnt2);
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aTriVertexes[2] = BRepBuilderAPI_MakeVertex (aPnt3);
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aWire = BRepBuilderAPI_MakePolygon (aTriVertexes[0], aTriVertexes[1], aTriVertexes[2], Standard_True);
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if (!aWire.IsNull())
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{
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aFace = BRepBuilderAPI_MakeFace (aWire);
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if (!aFace.IsNull())
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{
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BuildTool.Add (aComp, aFace);
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}
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}
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}
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}
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aSewingTool.Load (aComp);
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aSewingTool.Perform();
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theShape = aSewingTool.SewedShape();
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if (theShape.IsNull())
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{
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theShape = aComp;
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}
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return Standard_True;
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}
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