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1 | // Created on: 1993-01-21 |
2 | // Created by: Peter KURNEV |
3 | // Copyright (c) 1993-1999 Matra Datavision |
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4 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
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5 | // |
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6 | // This file is part of Open CASCADE Technology software library. |
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7 | // |
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8 | // This library is free software; you can redistribute it and/or modify it under |
9 | // the terms of the GNU Lesser General Public License version 2.1 as published |
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10 | // by the Free Software Foundation, with special exception defined in the file |
11 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
12 | // distribution for complete text of the license and disclaimer of any warranty. |
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13 | // |
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14 | // Alternatively, this file may be used under the terms of Open CASCADE |
15 | // commercial license or contractual agreement. |
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16 | |
17 | // File: BRepClass3d.cxx |
18 | // Created: Thu Sep 20 10:05:46 2012 |
19 | // Author: |
20 | // <pkv@PETREX> |
21 | |
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22 | #include <BRep_Builder.hxx> |
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23 | #include <BRepClass3d.hxx> |
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24 | #include <BRepClass3d_SolidClassifier.hxx> |
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25 | #include <TopAbs_Orientation.hxx> |
26 | #include <TopAbs_State.hxx> |
27 | #include <TopoDS_Iterator.hxx> |
28 | #include <TopoDS_Shell.hxx> |
29 | #include <TopoDS_Solid.hxx> |
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30 | |
31 | static |
32 | Standard_Boolean IsInternal(const TopoDS_Shell& aSx); |
33 | |
34 | //======================================================================= |
35 | //function : OuterShell |
36 | //purpose : |
37 | //======================================================================= |
38 | TopoDS_Shell BRepClass3d::OuterShell(const TopoDS_Solid& aSolid) |
39 | { |
40 | Standard_Boolean bFound; |
41 | Standard_Real aTol; |
42 | TopoDS_Solid aSDx; |
43 | TopoDS_Shell aShell, aDummy; |
44 | TopoDS_Iterator aIt; |
45 | BRep_Builder aBB; |
46 | BRepClass3d_SolidClassifier aSC; |
47 | // |
48 | if (aSolid.IsNull()) { |
49 | return aDummy; |
50 | } |
51 | // |
52 | aTol=1.e-7; |
53 | bFound=Standard_False; |
54 | // |
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55 | // if solid has one shell, it will return, without checking orientation |
56 | Standard_Integer aShellCounter = 0; |
57 | for (aIt.Initialize(aSolid); aIt.More(); aIt.Next()) { |
58 | const TopoDS_Shape& aSx=aIt.Value(); |
59 | if (aSx.ShapeType()==TopAbs_SHELL) { |
60 | aShell=*((TopoDS_Shell*)&aSx); |
61 | aShellCounter++; |
62 | if (aShellCounter >= 2) |
63 | break; |
64 | } |
65 | } |
66 | if (aShellCounter == 0) { |
67 | return aDummy; |
68 | } |
69 | else if (aShellCounter == 1) { |
70 | return aShell; |
71 | } |
72 | // |
73 | for (aIt.Initialize(aSolid); aIt.More(); aIt.Next()) { |
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74 | const TopoDS_Shape& aSx=aIt.Value(); |
75 | if (aSx.ShapeType()==TopAbs_SHELL) { |
76 | aShell=*((TopoDS_Shell*)&aSx); |
77 | if (!IsInternal(aShell)) { |
78 | aSDx=aSolid; |
79 | aSDx.EmptyCopy(); |
80 | aBB.Add(aSDx, aShell); |
81 | // |
82 | aSC.Load(aSDx); |
83 | aSC.PerformInfinitePoint(aTol); |
84 | if(aSC.State()==TopAbs_OUT) { |
85 | bFound=Standard_True; |
86 | break; |
87 | } |
88 | } |
89 | } |
90 | } |
91 | // |
92 | if (!bFound) { |
93 | return aDummy; |
94 | } |
95 | // |
96 | return aShell; |
97 | } |
98 | |
99 | //======================================================================= |
100 | //function : IsInternal |
101 | //purpose : |
102 | //======================================================================= |
103 | Standard_Boolean IsInternal(const TopoDS_Shell& aSx) |
104 | { |
105 | Standard_Boolean bInternal; |
106 | TopAbs_Orientation aOr; |
107 | TopoDS_Iterator aIt; |
108 | // |
109 | bInternal=Standard_False; |
110 | // |
111 | aIt.Initialize(aSx); |
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112 | if (aIt.More()) { |
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113 | const TopoDS_Shape& aSy=aIt.Value(); |
114 | aOr=aSy.Orientation(); |
115 | bInternal=(aOr==TopAbs_INTERNAL); |
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116 | } |
117 | // |
118 | return bInternal; |
119 | } |