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25 // 25 //
>> 26 //
>> 27 //
>> 28 //
26 // class G4BoundingEnvelope 29 // class G4BoundingEnvelope
27 // 30 //
28 // Class description: 31 // Class description:
29 // 32 //
30 // Helper class to facilitate calculation of t 33 // Helper class to facilitate calculation of the extent of a solid
31 // within the limits defined by a G4VoxelLimit 34 // within the limits defined by a G4VoxelLimits object.
32 // 35 //
33 // The function CalculateExtent() of a particu 36 // The function CalculateExtent() of a particular solid can create
34 // a G4BoundingEnvelope object that bounds the 37 // a G4BoundingEnvelope object that bounds the solid and then call
35 // CalculateExtent() of the G4BoundingEnvelope 38 // CalculateExtent() of the G4BoundingEnvelope object.
36 // 39 //
37 // Calculation of extent uses G4Transform3D, t 40 // Calculation of extent uses G4Transform3D, thus takes into account
38 // scaling and reflection, if any. 41 // scaling and reflection, if any.
39 42
40 // 2016.05.25, E.Tcherniaev - initial version << 43 // History:
>> 44 //
>> 45 // 2016.05.25 E.Tcherniaev - initial version
>> 46 //
41 // ------------------------------------------- 47 // --------------------------------------------------------------------
42 #ifndef G4BOUNDINGENVELOPE_HH 48 #ifndef G4BOUNDINGENVELOPE_HH
43 #define G4BOUNDINGENVELOPE_HH 49 #define G4BOUNDINGENVELOPE_HH
44 50
45 #include <vector> 51 #include <vector>
46 #include "geomdefs.hh" 52 #include "geomdefs.hh"
47 53
48 #include "G4ThreeVector.hh" 54 #include "G4ThreeVector.hh"
49 #include "G4VoxelLimits.hh" 55 #include "G4VoxelLimits.hh"
50 #include "G4Transform3D.hh" 56 #include "G4Transform3D.hh"
51 #include "G4Point3D.hh" 57 #include "G4Point3D.hh"
52 #include "G4Plane3D.hh" 58 #include "G4Plane3D.hh"
53 59
54 using G4ThreeVectorList = std::vector<G4ThreeV << 60 typedef std::vector<G4ThreeVector> G4ThreeVectorList;
55 using G4Polygon3D = std::vector<G4Point3D>; << 61 typedef std::vector<G4Point3D> G4Polygon3D;
56 using G4Segment3D = std::pair<G4Point3D,G4Poin << 62 typedef std::pair<G4Point3D,G4Point3D> G4Segment3D;
57 63
58 class G4BoundingEnvelope 64 class G4BoundingEnvelope
59 { 65 {
60 public: 66 public:
61 67
62 G4BoundingEnvelope(const G4ThreeVector& pM 68 G4BoundingEnvelope(const G4ThreeVector& pMin,
63 const G4ThreeVector& pM 69 const G4ThreeVector& pMax);
64 // Constructor from an axis aligned boun 70 // Constructor from an axis aligned bounding box (AABB)
65 71
66 G4BoundingEnvelope(const std::vector<const 72 G4BoundingEnvelope(const std::vector<const G4ThreeVectorList*>& polygons);
67 // Constructor from a sequence of convex 73 // Constructor from a sequence of convex polygons, the polygons
68 // should have equal numbers of vertices 74 // should have equal numbers of vertices except first and last
69 // polygons which may consist of a singl 75 // polygons which may consist of a single vertex
70 76
71 G4BoundingEnvelope(const G4ThreeVector& pM << 77 G4BoundingEnvelope(const G4ThreeVector& pMin,
72 const G4ThreeVector& pM 78 const G4ThreeVector& pMax,
73 const std::vector<const 79 const std::vector<const G4ThreeVectorList*>& polygons);
74 // Constructor from AABB and a sequence 80 // Constructor from AABB and a sequence of polygons
75 81
76 ~G4BoundingEnvelope() = default; << 82 ~G4BoundingEnvelope();
77 // Destructor 83 // Destructor
78 84
79 G4bool BoundingBoxVsVoxelLimits(const EAxi 85 G4bool BoundingBoxVsVoxelLimits(const EAxis pAxis,
80 const G4Vo 86 const G4VoxelLimits& pVoxelLimits,
81 const G4Tr 87 const G4Transform3D& pTransform3D,
82 G4double& 88 G4double& pMin, G4double& pMax) const;
83 // Analyse the position of the bounding 89 // Analyse the position of the bounding box relative to the voxel.
84 // It returns "true" in the case where t 90 // It returns "true" in the case where the value of the extent can be
85 // figured out directly from the dimensi 91 // figured out directly from the dimensions of the bounding box, or
86 // it is clear that the bounding box and 92 // it is clear that the bounding box and the voxel do not intersect.
87 // The reply "false" means that further 93 // The reply "false" means that further calculations are needed.
88 94
89 G4bool CalculateExtent(const EAxis pAxis, 95 G4bool CalculateExtent(const EAxis pAxis,
90 const G4VoxelLimits 96 const G4VoxelLimits& pVoxelLimits,
91 const G4Transform3D 97 const G4Transform3D& pTransform3D,
92 G4double& pMin, G4d 98 G4double& pMin, G4double& pMax) const;
93 // Calculate extent of the bounding enve 99 // Calculate extent of the bounding envelope
94 100
95 private: 101 private:
96 102
97 void CheckBoundingBox(); 103 void CheckBoundingBox();
98 // Check correctness of the AABB (axis a 104 // Check correctness of the AABB (axis aligned bounding box)
99 105
100 void CheckBoundingPolygons(); 106 void CheckBoundingPolygons();
101 // Check correctness of the sequence of 107 // Check correctness of the sequence of convex polygonal bases
102 108
103 G4double FindScaleFactor(const G4Transform 109 G4double FindScaleFactor(const G4Transform3D& pTransform3D) const;
104 // Find max scale factor of the transfor 110 // Find max scale factor of the transformation
105 111
106 void TransformVertices(const G4Transform3D 112 void TransformVertices(const G4Transform3D& pTransform3D,
107 std::vector<G << 113 std::vector<G4Polygon3D*>& pBases) const;
108 std::vector<s <<
109 // Create list of transformed polygons 114 // Create list of transformed polygons
110 115
111 void GetPrismAABB(const G4Polygon3D& pBase 116 void GetPrismAABB(const G4Polygon3D& pBaseA,
112 const G4Polygon3D& pBase 117 const G4Polygon3D& pBaseB,
113 G4Segment3D& pAABB 118 G4Segment3D& pAABB) const;
114 // Find bounding box of a prism 119 // Find bounding box of a prism
115 120
116 void CreateListOfEdges(const G4Polygon3D& 121 void CreateListOfEdges(const G4Polygon3D& baseA,
117 const G4Polygon3D& 122 const G4Polygon3D& baseB,
118 std::vector<G 123 std::vector<G4Segment3D>& pEdges) const;
119 // Create list of edges of a prism 124 // Create list of edges of a prism
120 << 125
121 void CreateListOfPlanes(const G4Polygon3D& 126 void CreateListOfPlanes(const G4Polygon3D& baseA,
122 const G4Polygon3D& 127 const G4Polygon3D& baseB,
123 std::vector< 128 std::vector<G4Plane3D>& pPlanes) const;
124 // Create list of planes bounding a pris 129 // Create list of planes bounding a prism
125 130
126 G4bool ClipEdgesByVoxel(const std::vector< 131 G4bool ClipEdgesByVoxel(const std::vector<G4Segment3D>& pEdges,
127 const G4VoxelLimit 132 const G4VoxelLimits& pLimits,
128 G4Segment3D& 133 G4Segment3D& pExtent) const;
129 // Clip set of edges by G4VoxelLimits 134 // Clip set of edges by G4VoxelLimits
130 135
131 void ClipVoxelByPlanes(G4int pBits, 136 void ClipVoxelByPlanes(G4int pBits,
132 const G4VoxelLimits 137 const G4VoxelLimits& pLimits,
133 const std::vector<G 138 const std::vector<G4Plane3D>& pPlanes,
134 const G4Segment3D& 139 const G4Segment3D& pAABB,
135 G4Segment3D& 140 G4Segment3D& pExtent) const;
136 // Clip G4VoxelLimits by set of planes b 141 // Clip G4VoxelLimits by set of planes bounding a prism
137 142
138 private: 143 private:
139 144
140 G4ThreeVector fMin, fMax; << 145 G4ThreeVector fMin, fMax;
141 // original bounding box 146 // original bounding box
142 147
143 const std::vector<const G4ThreeVectorList* << 148 const std::vector<const G4ThreeVectorList*>* fPolygons;
144 // ref to original sequence of polygonal 149 // ref to original sequence of polygonal bases
145 }; 150 };
146 151
147 #endif // G4BOUNDINGENVELOPE_HH 152 #endif // G4BOUNDINGENVELOPE_HH
148 153