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116 lines
3.0 KiB
C++
116 lines
3.0 KiB
C++
// Created on: 1993-01-21
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// Created by: Peter KURNEV
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// Copyright (c) 1993-1999 Matra Datavision
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// 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 <BRepClass3d.hxx>
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#include <BRep_Builder.hxx>
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#include <BRepClass3d_SolidClassifier.hxx>
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#include <TopAbs_Orientation.hxx>
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#include <TopAbs_State.hxx>
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#include <TopoDS_Iterator.hxx>
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#include <TopoDS_Shell.hxx>
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#include <TopoDS_Solid.hxx>
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static
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Standard_Boolean IsInternal(const TopoDS_Shell& aSx);
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//=======================================================================
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//function : OuterShell
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//purpose :
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//=======================================================================
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TopoDS_Shell BRepClass3d::OuterShell(const TopoDS_Solid& aSolid)
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{
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Standard_Boolean bFound;
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Standard_Real aTol;
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TopoDS_Solid aSDx;
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TopoDS_Shell aShell, aDummy;
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TopoDS_Iterator aIt;
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BRep_Builder aBB;
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BRepClass3d_SolidClassifier aSC;
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//
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if (aSolid.IsNull()) {
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return aDummy;
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}
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//
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aTol=1.e-7;
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bFound=Standard_False;
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//
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// if solid has one shell, it will return, without checking orientation
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Standard_Integer aShellCounter = 0;
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for (aIt.Initialize(aSolid); aIt.More(); aIt.Next()) {
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const TopoDS_Shape& aSx=aIt.Value();
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if (aSx.ShapeType()==TopAbs_SHELL) {
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aShell=*((TopoDS_Shell*)&aSx);
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aShellCounter++;
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if (aShellCounter >= 2)
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break;
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}
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}
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if (aShellCounter == 0) {
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return aDummy;
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}
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else if (aShellCounter == 1) {
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return aShell;
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}
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//
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for (aIt.Initialize(aSolid); aIt.More(); aIt.Next()) {
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const TopoDS_Shape& aSx=aIt.Value();
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if (aSx.ShapeType()==TopAbs_SHELL) {
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aShell=*((TopoDS_Shell*)&aSx);
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if (!IsInternal(aShell)) {
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aSDx=aSolid;
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aSDx.EmptyCopy();
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aBB.Add(aSDx, aShell);
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//
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aSC.Load(aSDx);
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aSC.PerformInfinitePoint(aTol);
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if(aSC.State()==TopAbs_OUT) {
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bFound=Standard_True;
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break;
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}
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}
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}
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}
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//
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if (!bFound) {
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return aDummy;
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}
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//
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return aShell;
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}
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//=======================================================================
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//function : IsInternal
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//purpose :
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//=======================================================================
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Standard_Boolean IsInternal(const TopoDS_Shell& aSx)
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{
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Standard_Boolean bInternal;
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TopAbs_Orientation aOr;
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TopoDS_Iterator aIt;
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//
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bInternal=Standard_False;
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//
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aIt.Initialize(aSx);
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if (aIt.More()) {
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const TopoDS_Shape& aSy=aIt.Value();
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aOr=aSy.Orientation();
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bInternal=(aOr==TopAbs_INTERNAL);
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}
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//
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return bInternal;
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}
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