[831] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // $Id: G4FCylindricalSurface.cc,v 1.16 2006/06/29 18:42:14 gunter Exp $ |
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[850] | 28 | // GEANT4 tag $Name: HEAD $ |
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[831] | 29 | // |
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| 30 | // ---------------------------------------------------------------------- |
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| 31 | // GEANT 4 class source file |
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| 32 | // |
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| 33 | // G4FCylindricalSurface.cc |
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| 34 | // |
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| 35 | // ---------------------------------------------------------------------- |
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| 36 | |
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| 37 | #include "G4FCylindricalSurface.hh" |
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| 38 | #include "G4Sort.hh" |
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| 39 | |
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| 40 | |
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| 41 | G4FCylindricalSurface::G4FCylindricalSurface() |
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| 42 | : length(1.) |
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| 43 | { |
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| 44 | } |
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| 45 | |
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| 46 | |
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| 47 | G4FCylindricalSurface::~G4FCylindricalSurface() |
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| 48 | { |
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| 49 | } |
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| 50 | |
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| 51 | |
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| 52 | G4FCylindricalSurface::G4FCylindricalSurface( const G4Point3D& o, |
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| 53 | const G4Vector3D& a, |
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| 54 | G4double r, |
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| 55 | G4double l |
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| 56 | ) |
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| 57 | { |
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| 58 | // make a G4FCylindricalSurface with origin o, axis a, |
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| 59 | // radius r, and length l |
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| 60 | G4Vector3D dir(1,1,1); |
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| 61 | Position.Init(dir, a, o); |
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| 62 | |
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| 63 | origin = o; |
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| 64 | radius = r; |
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| 65 | |
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| 66 | // Require length to be positive or zero |
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| 67 | if ( l >= 0.0 ) |
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| 68 | length = l; |
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| 69 | else |
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| 70 | { |
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| 71 | G4cerr << "Error in G4FCylindricalSurface::G4FCylindricalSurface" |
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| 72 | << "--asked for negative length\n" |
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| 73 | << "\tDefault length of 0.0 is used.\n"; |
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| 74 | |
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| 75 | length = 0.0; |
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| 76 | } |
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| 77 | |
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| 78 | // Require radius to be non-negative (i.e., allow zero) |
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| 79 | if ( r >= 0.0 ) |
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| 80 | radius = r; |
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| 81 | else |
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| 82 | { |
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| 83 | G4cerr << "Error in G4FCylindricalSurface::G4FCylindricalSurface" |
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| 84 | << "--asked for negative radius\n" |
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| 85 | << "\tDefault value of 0.0 is used.\n"; |
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| 86 | |
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| 87 | radius = 0.0; |
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| 88 | } |
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| 89 | } |
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| 90 | |
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| 91 | |
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| 92 | const char* G4FCylindricalSurface::NameOf() const |
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| 93 | { |
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| 94 | return "G4FCylindricalSurface"; |
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| 95 | } |
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| 96 | |
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| 97 | |
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| 98 | void G4FCylindricalSurface::PrintOn( std::ostream& os ) const |
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| 99 | { |
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| 100 | os << "G4FCylindricalSurface with origin: " << origin << "\t" |
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| 101 | << "and axis: " << Position.GetAxis() << "\n" |
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| 102 | << "\t radius: " << radius << "\t and length: " |
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| 103 | << length << "\n"; |
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| 104 | } |
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| 105 | |
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| 106 | |
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| 107 | G4double G4FCylindricalSurface::Area() const |
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| 108 | { |
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| 109 | return ( 2.0 * pi * radius * length ); |
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| 110 | } |
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| 111 | |
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| 112 | |
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| 113 | // Added 18.7-95 |
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| 114 | // Modified by L. Broglia (01/12/98) |
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| 115 | void G4FCylindricalSurface::CalcBBox() |
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| 116 | { |
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| 117 | // Finds the bounds of the surface iow |
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| 118 | // calculates the bounds for a bounding box |
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| 119 | // to the surface. The bounding box is used |
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| 120 | // for a preliminary check of intersection. |
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| 121 | G4Point3D Max = G4Point3D(-PINFINITY); |
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| 122 | G4Point3D Min = G4Point3D( PINFINITY); |
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| 123 | |
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| 124 | G4Point3D Tmp; |
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| 125 | G4Point3D Origin = Position.GetLocation(); |
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| 126 | G4Point3D EndOrigin = G4Point3D( Origin + (length*Position.GetAxis()) ); |
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| 127 | G4Point3D Radius(radius, radius, 0); |
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| 128 | |
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| 129 | // Default BBox |
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| 130 | G4Point3D Tolerance(kCarTolerance, kCarTolerance, kCarTolerance); |
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| 131 | G4Point3D BoxMin(Origin-Tolerance); |
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| 132 | G4Point3D BoxMax(Origin+Tolerance); |
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| 133 | |
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| 134 | bbox = new G4BoundingBox3D(); |
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| 135 | bbox->Init(BoxMin, BoxMax); |
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| 136 | |
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| 137 | |
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| 138 | Tmp = (Origin - Radius); |
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| 139 | bbox->Extend(Tmp); |
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| 140 | |
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| 141 | Tmp = Origin + Radius; |
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| 142 | bbox->Extend(Tmp); |
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| 143 | |
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| 144 | Tmp = EndOrigin - Radius; |
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| 145 | bbox->Extend(Tmp); |
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| 146 | |
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| 147 | Tmp = EndOrigin + Radius; |
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| 148 | bbox->Extend(Tmp); |
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| 149 | } |
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| 150 | |
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| 151 | |
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| 152 | G4int G4FCylindricalSurface::Intersect( const G4Ray& ry ) |
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| 153 | { |
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| 154 | // This function count the number of intersections of a |
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| 155 | // bounded cylindrical surface by a ray. |
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| 156 | // At first, calculates the intersections with the infinite |
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| 157 | // cylindrical surfsace. After, count the intersections within the |
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| 158 | // finite cylindrical surface boundaries, and set "distance" to the |
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| 159 | // closest distance from the start point to the nearest intersection |
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| 160 | // If the point is on the surface it returns or the intersection with |
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| 161 | // the opposite surface or kInfinity |
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| 162 | |
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| 163 | // If no intersection is founded, set distance = kInfinity and |
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| 164 | // return 0 |
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| 165 | |
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| 166 | distance = kInfinity; |
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| 167 | closest_hit = PINFINITY; |
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| 168 | |
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| 169 | // origin and direction of the ray |
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| 170 | G4Point3D x = ry.GetStart(); |
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| 171 | G4Vector3D dhat = ry.GetDir(); |
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| 172 | |
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| 173 | // cylinder axis |
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| 174 | G4Vector3D ahat = Position.GetAxis(); |
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| 175 | |
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| 176 | // array of solutions in distance along the ray |
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| 177 | G4double s[2]; |
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| 178 | s[0]=-1.0; |
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| 179 | s[1]=-1.0; |
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| 180 | |
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| 181 | // calculate the two intersections (quadratic equation) |
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| 182 | G4Vector3D gamma = G4Vector3D( x - Position.GetLocation() ); |
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| 183 | |
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| 184 | G4double ga = gamma * ahat; |
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| 185 | G4double da = dhat * ahat; |
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| 186 | |
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| 187 | G4double A = da * da - dhat * dhat; |
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| 188 | G4double B = 2 * ( -gamma * dhat + ga * da ); |
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| 189 | G4double C = -gamma * gamma + ga * ga + radius * radius ; |
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| 190 | |
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| 191 | G4double radical = B * B - 4.0 * A * C; |
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| 192 | |
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| 193 | if ( radical < 0.0 ) |
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| 194 | // no intersection |
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| 195 | return 0; |
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| 196 | else |
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| 197 | { |
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| 198 | G4double root = std::sqrt( radical ); |
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| 199 | s[0] = ( - B + root ) / ( 2. * A ); |
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| 200 | s[1] = ( - B - root ) / ( 2. * A ); |
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| 201 | } |
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| 202 | |
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| 203 | // validity of the solutions |
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| 204 | // the hit point must be into the bounding box of the cylindrical surface |
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| 205 | G4Point3D p0 = G4Point3D( x + s[0]*dhat ); |
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| 206 | G4Point3D p1 = G4Point3D( x + s[1]*dhat ); |
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| 207 | |
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| 208 | if( !GetBBox()->Inside(p0) ) |
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| 209 | s[0] = kInfinity; |
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| 210 | |
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| 211 | if( !GetBBox()->Inside(p1) ) |
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| 212 | s[1] = kInfinity; |
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| 213 | |
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| 214 | // now loop over each positive solution, keeping the first one (smallest |
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| 215 | // distance along the Ray) which is within the boundary of the sub-shape |
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| 216 | G4int nbinter = 0; |
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| 217 | distance = kInfinity; |
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| 218 | |
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| 219 | for ( G4int i = 0; i < 2; i++ ) |
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| 220 | { |
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| 221 | if(s[i] < kInfinity) { |
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| 222 | if ( s[i] >= kCarTolerance*0.5 ) { |
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| 223 | nbinter ++; |
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| 224 | // real intersection |
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| 225 | // set the distance if it is the smallest |
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| 226 | if( distance > s[i]*s[i]) { |
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| 227 | distance = s[i]*s[i]; |
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| 228 | } |
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| 229 | } |
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| 230 | } |
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| 231 | } |
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| 232 | |
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| 233 | return nbinter; |
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| 234 | } |
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| 235 | |
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| 236 | |
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| 237 | G4double G4FCylindricalSurface::HowNear( const G4Vector3D& x ) const |
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| 238 | { |
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| 239 | // Shortest distance from the point x to the G4FCylindricalSurface. |
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| 240 | // The distance will be always positive |
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| 241 | |
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| 242 | G4double hownear; |
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| 243 | |
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| 244 | G4Vector3D upcorner = G4Vector3D ( radius, 0 , origin.z()+length); |
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| 245 | G4Vector3D downcorner = G4Vector3D ( radius, 0 , origin.z()); |
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| 246 | G4Vector3D xd; |
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| 247 | |
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| 248 | xd = G4Vector3D ( std::sqrt ( x.x()*x.x() + x.y()*x.y() ) , 0 , x.z() ); |
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| 249 | |
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| 250 | |
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| 251 | G4double Zinter = (xd.z()) ; |
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| 252 | |
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| 253 | if ( ((Zinter >= downcorner.z()) && (Zinter <=upcorner.z())) ) { |
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| 254 | hownear = std::fabs( radius - xd.x() ); |
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| 255 | } else { |
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| 256 | hownear = std::min ( (xd-upcorner).mag() , (xd-downcorner).mag() ); |
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| 257 | } |
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| 258 | |
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| 259 | return hownear; |
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| 260 | } |
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| 261 | |
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| 262 | G4int G4FCylindricalSurface::WithinBoundary( const G4Vector3D& x ) const |
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| 263 | { |
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| 264 | // return 1 if point x is within the boundaries of the G4FCylindricalSurface |
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| 265 | // return 0 otherwise (assume it is on the cylinder) |
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| 266 | if ( std::fabs( ( x - Position.GetLocation()) * Position.GetAxis() ) |
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| 267 | <= 0.5 * length ) |
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| 268 | return 1; |
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| 269 | else |
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| 270 | return 0; |
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| 271 | } |
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| 272 | |
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| 273 | |
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| 274 | G4double G4FCylindricalSurface::Scale() const |
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| 275 | { |
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| 276 | // Returns the radius of a G4FCylindricalSurface unless it is zero, |
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| 277 | // in which case returns the length. |
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| 278 | // Used for Scale-invariant tests of surface thickness. |
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| 279 | if ( radius == 0.0 ) |
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| 280 | return length; |
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| 281 | else |
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| 282 | return radius; |
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| 283 | } |
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| 284 | |
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| 285 | |
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| 286 | G4Vector3D G4FCylindricalSurface::SurfaceNormal( const G4Point3D& p ) const |
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| 287 | { |
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| 288 | // return the Normal unit vector to the G4CylindricalSurface at a point |
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| 289 | // p on (or nearly on) the G4CylindricalSurface |
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| 290 | |
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| 291 | G4Vector3D n = G4Vector3D( ( p - Position.GetLocation() ) - |
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| 292 | ( ( p - Position.GetLocation()) * |
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| 293 | Position.GetAxis() ) * Position.GetAxis() ); |
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| 294 | G4double nmag = n.mag(); |
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| 295 | |
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| 296 | if ( nmag != 0.0 ) |
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| 297 | n = n * (1/nmag); |
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| 298 | |
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| 299 | if( !sameSense ) |
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| 300 | n = -n; |
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| 301 | |
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| 302 | return n; |
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| 303 | } |
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| 304 | |
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| 305 | G4int G4FCylindricalSurface::Inside ( const G4Vector3D& x ) const |
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| 306 | { |
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| 307 | // Return 0 if point x is outside G4CylindricalSurface, 1 if Inside. |
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| 308 | // Outside means that the distance to the G4CylindricalSurface would |
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| 309 | // be negative. |
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| 310 | // Use the HowNear function to calculate this distance. |
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| 311 | if ( HowNear( x ) >= -0.5*kCarTolerance ) |
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| 312 | return 1; |
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| 313 | else |
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| 314 | return 0; |
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| 315 | } |
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| 316 | |
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| 317 | |
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| 318 | void G4FCylindricalSurface::resize( G4double r, G4double l ) |
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| 319 | { |
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| 320 | // Resize a G4FCylindricalSurface to a new radius r and new length l |
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| 321 | // Require radius to be non-negative |
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| 322 | if ( r >= 0.0 ) |
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| 323 | radius = r; |
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| 324 | else |
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| 325 | { |
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| 326 | G4cerr << "Error in G4FCylindricalSurface::resize" |
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| 327 | << "--asked for negative radius\n" |
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| 328 | << "\tOriginal value of " << radius << " is retained.\n"; |
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| 329 | } |
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| 330 | |
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| 331 | // Require length to be positive |
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| 332 | if ( l > 0.0 ) |
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| 333 | length = l; |
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| 334 | else |
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| 335 | { |
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| 336 | G4cerr << "Error in G4FCylindricalSurface::resize" |
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| 337 | << "--asked for negative or zero length\n" |
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| 338 | << "\tOriginal value of " << length << " is retained.\n"; |
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| 339 | } |
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| 340 | } |
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