[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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[850] | 27 | // $Id: G4Ray.cc,v 1.12 2008/07/08 10:00:58 gcosmo Exp $ |
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| 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 | // G4Ray.cc |
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| 34 | // |
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| 35 | // ---------------------------------------------------------------------- |
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| 36 | |
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| 37 | #include "G4Ray.hh" |
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| 38 | #include "G4PointRat.hh" |
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| 39 | |
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| 40 | G4Ray::G4Ray() |
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| 41 | { |
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| 42 | } |
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| 43 | |
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| 44 | G4Ray::G4Ray(const G4Point3D& start0, const G4Vector3D& dir0) |
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| 45 | { |
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| 46 | Init(start0, dir0); |
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| 47 | } |
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| 48 | |
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| 49 | G4Ray::~G4Ray() |
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| 50 | { |
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| 51 | } |
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| 52 | |
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| 53 | |
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| 54 | const G4Plane& G4Ray::GetPlane(G4int number_of_plane) const |
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| 55 | { |
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| 56 | if(number_of_plane==1) |
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[850] | 57 | { return plane2; } |
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[831] | 58 | else |
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[850] | 59 | { return plane1; } |
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[831] | 60 | } |
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| 61 | |
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| 62 | |
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| 63 | void G4Ray::CreatePlanes() |
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| 64 | { |
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| 65 | // Creates two orthogonal planes(plane1,plane2) the ray (rray) |
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| 66 | // situated in the intersection of the planes. The planes are |
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| 67 | // used to project the surface (nurb) in two dimensions. |
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| 68 | |
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| 69 | G4Vector3D RayDir = dir; |
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| 70 | G4Point3D RayOrigin = start; |
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| 71 | |
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| 72 | G4Point3D p1, p2, p3, p4; |
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| 73 | G4Vector3D dir1, dir2; |
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| 74 | G4Vector3D invdir = G4Vector3D( PINFINITY ); |
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| 75 | |
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| 76 | if(!NearZero(RayDir.x(), SQRT_SMALL_FASTF)) |
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[850] | 77 | { invdir.setX(1.0 / RayDir.x()); } |
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[831] | 78 | |
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| 79 | if(!NearZero(RayDir.y(), SQRT_SMALL_FASTF)) |
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[850] | 80 | { invdir.setY(1.0 / RayDir.y()); } |
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[831] | 81 | |
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| 82 | if(!NearZero(RayDir.z(), SQRT_SMALL_FASTF)) |
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[850] | 83 | { invdir.setZ(1.0 / RayDir.z()); } |
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[831] | 84 | |
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| 85 | MatVecOrtho(dir1, RayDir); |
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| 86 | |
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| 87 | Vcross( dir2, RayDir, dir1); |
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| 88 | Vmove(p1, RayOrigin); |
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| 89 | Vadd2(p2, RayOrigin, RayDir); |
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| 90 | Vadd2(p3, RayOrigin, dir1); |
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| 91 | Vadd2(p4, RayOrigin, dir2); |
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| 92 | |
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| 93 | CalcPlane3Pts( plane1, p1, p3, p2); |
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| 94 | CalcPlane3Pts( plane2, p1, p2, p4); |
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| 95 | } |
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| 96 | |
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| 97 | |
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| 98 | void G4Ray::MatVecOrtho(register G4Vector3D &out, |
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| 99 | register const G4Vector3D &in ) |
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| 100 | { |
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| 101 | register G4double f; |
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| 102 | G4int i_Which; |
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| 103 | |
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[850] | 104 | if( NearZero(in.x(), 0.0001) |
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| 105 | && NearZero(in.y(), 0.0001) |
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| 106 | && NearZero(in.z(), 0.0001) ) |
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[831] | 107 | { |
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| 108 | Vsetall( out, 0 ); |
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| 109 | return; |
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| 110 | } |
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| 111 | |
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| 112 | // Find component closest to zero |
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| 113 | f = std::fabs(in.x()); |
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| 114 | i_Which=0; |
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| 115 | |
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| 116 | if( std::fabs(in.y()) < f ) |
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| 117 | { |
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| 118 | f = std::fabs(in.y()); |
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| 119 | i_Which=1; |
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| 120 | } |
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| 121 | |
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| 122 | if( std::fabs(in.z()) < f ) |
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[850] | 123 | { |
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[831] | 124 | i_Which=2; |
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[850] | 125 | } |
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[831] | 126 | |
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| 127 | if(!i_Which) |
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[850] | 128 | { |
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[831] | 129 | f = std::sqrt((in.y())*(in.y())+(in.z())*(in.z())); // hypot(in.y(),in.z()) |
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[850] | 130 | } |
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[831] | 131 | else |
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[850] | 132 | { |
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[831] | 133 | if(i_Which==1) |
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[850] | 134 | { |
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[831] | 135 | f = std::sqrt((in.z())*(in.z())+(in.x())*(in.x())); // hypot(in.z(),in.x()) |
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[850] | 136 | } |
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[831] | 137 | else |
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[850] | 138 | { |
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[831] | 139 | f = std::sqrt((in.x())*(in.x())+(in.y())*(in.y())); // hypot(in.x(),in.y()) |
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| 140 | } |
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[850] | 141 | } |
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| 142 | if( NearZero( f, SMALL ) ) |
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| 143 | { |
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| 144 | Vsetall( out, 0 ); |
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| 145 | return; |
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| 146 | } |
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[831] | 147 | |
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[850] | 148 | f = 1.0/f; |
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[831] | 149 | |
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[850] | 150 | if(!i_Which) |
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| 151 | { |
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| 152 | out.setX(0.0); |
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| 153 | out.setY(-in.z()*f); |
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| 154 | out.setZ( in.y()*f); |
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| 155 | } |
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| 156 | else |
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| 157 | { |
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| 158 | if(i_Which==1) |
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[831] | 159 | { |
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[850] | 160 | out.setY(0.0); |
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| 161 | out.setZ(-in.x()*f); |
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| 162 | out.setX( in.y()*f); |
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[831] | 163 | } |
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| 164 | else |
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[850] | 165 | { |
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| 166 | out.setZ(0.0); |
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| 167 | out.setX(-in.z()*f); |
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| 168 | out.setY( in.y()*f); |
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| 169 | } |
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| 170 | } |
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[831] | 171 | } |
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| 172 | |
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| 173 | |
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| 174 | // CALC_PLANE_3PTS |
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| 175 | // |
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| 176 | // Find the equation of a G4Plane that contains three points. |
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| 177 | // Note that Normal vector created is expected to point out (see vmath.h), |
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| 178 | // so the vector from A to C had better be counter-clockwise |
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| 179 | // (about the point A) from the vector from A to B. |
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| 180 | // This follows the outward-pointing Normal convention, and the |
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| 181 | // right-hand rule for cross products. |
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| 182 | // |
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| 183 | /* |
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| 184 | C |
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| 185 | * |
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| 186 | |\ |
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| 187 | | \ |
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| 188 | ^ N | \ |
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| 189 | | \ | \ |
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| 190 | | \ | \ |
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| 191 | |C-A \ | \ |
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| 192 | | \ | \ |
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| 193 | | \ | \ |
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| 194 | \| \ |
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| 195 | *---------* |
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| 196 | A B |
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| 197 | -----> |
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| 198 | B-A |
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| 199 | */ |
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| 200 | // If the points are given in the order A B C (eg, *counter*-clockwise), |
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| 201 | // then the outward pointing surface Normal N = (B-A) x (C-A). |
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| 202 | // |
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| 203 | // Explicit Return - |
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| 204 | // 0 OK |
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| 205 | // -1 Failure. At least two of the points were not distinct, |
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| 206 | // or all three were colinear. |
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| 207 | // |
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| 208 | // Implicit Return - |
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| 209 | // G4Plane The G4Plane equation is stored here. |
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| 210 | |
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| 211 | |
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| 212 | G4int G4Ray::CalcPlane3Pts(G4Plane &plane1, |
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| 213 | const G4Point3D& a, |
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| 214 | const G4Point3D& b, |
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| 215 | const G4Point3D& c ) |
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| 216 | { |
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| 217 | // Creates the two orthogonal planes which are needed in projecting the |
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| 218 | // surface into 2D. |
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| 219 | |
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| 220 | G4Vector3D B_A; |
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| 221 | G4Vector3D C_A; |
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| 222 | G4Vector3D C_B; |
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| 223 | |
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| 224 | register G4double mag; |
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| 225 | |
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| 226 | Vsub2( B_A, b, a ); |
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| 227 | Vsub2( C_A, c, a ); |
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| 228 | Vsub2( C_B, c, b ); |
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| 229 | |
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| 230 | Vcross( plane1, B_A, C_A ); |
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| 231 | |
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| 232 | // Ensure unit length Normal |
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| 233 | mag = Magnitude(plane1); |
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| 234 | if( mag <= SQRT_SMALL_FASTF ) |
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[850] | 235 | { |
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[831] | 236 | return(-1);// FAIL |
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[850] | 237 | } |
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[831] | 238 | |
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| 239 | mag = 1/mag; |
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| 240 | |
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| 241 | G4Plane pl2(plane1); |
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| 242 | Vscale( plane1, pl2, mag ); |
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| 243 | |
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| 244 | // Find distance from the origin to the G4Plane |
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| 245 | plane1.d = Vdot( plane1, a ); |
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| 246 | |
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| 247 | return(0); //ok |
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| 248 | } |
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| 249 | |
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| 250 | |
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| 251 | void G4Ray::RayCheck() |
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| 252 | { |
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| 253 | // Check that the ray has a G4Vector3D... |
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| 254 | if (dir==G4Vector3D(0, 0, 0)) |
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| 255 | { |
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[850] | 256 | G4Exception("G4Ray::RayCheck()", "InvalidInput", FatalException, |
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| 257 | "Invalid zero direction given !"); |
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[831] | 258 | } |
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| 259 | |
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| 260 | // Make sure that the vector is unit length |
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| 261 | dir= dir.unit(); |
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| 262 | r_min = 0; |
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| 263 | r_max = 0; |
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| 264 | } |
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| 265 | |
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| 266 | |
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| 267 | void G4Ray::Vcross(G4Plane &a, const G4Vector3D &b, const G4Vector3D &c) |
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| 268 | { |
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| 269 | a.a = b.y() * c.z() - b.z() * c.y() ; |
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| 270 | a.b = b.z() * c.x() - b.x() * c.z() ; |
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| 271 | a.c = b.x() * c.y() - b.y() * c.x() ; |
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| 272 | } |
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| 273 | |
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| 274 | |
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| 275 | void G4Ray::Vcross(G4Vector3D &a, const G4Vector3D &b, const G4Vector3D &c) |
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| 276 | { |
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| 277 | a.setX(b.y() * c.z() - b.z() * c.y()) ; |
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| 278 | a.setY(b.z() * c.x() - b.x() * c.z()) ; |
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| 279 | a.setZ(b.x() * c.y() - b.y() * c.x()) ; |
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| 280 | } |
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| 281 | |
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| 282 | |
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| 283 | void G4Ray::Vmove(G4Point3D &a, const G4Point3D &b) |
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| 284 | { |
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| 285 | a.setX(b.x()); |
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| 286 | a.setY(b.y()); |
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| 287 | a.setZ(b.z()); |
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| 288 | } |
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| 289 | |
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| 290 | |
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| 291 | void G4Ray::Vadd2(G4Point3D &a, const G4Point3D &b, const G4Vector3D &c) |
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| 292 | { |
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| 293 | a.setX(b.x() + c.x()) ; |
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| 294 | a.setY(b.y() + c.y()) ; |
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| 295 | a.setZ(b.z() + c.z()) ; |
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| 296 | } |
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| 297 | |
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| 298 | |
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| 299 | void G4Ray::Vsub2(G4Vector3D &a, const G4Point3D &b, const G4Point3D &c) |
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| 300 | { |
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| 301 | a.setX(b.x() - c.x()); |
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| 302 | a.setY(b.y() - c.y()); |
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| 303 | a.setZ(b.z() - c.z()); |
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| 304 | } |
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| 305 | |
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| 306 | |
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| 307 | void G4Ray::Vscale(G4Plane& a, const G4Plane& b, G4double c) |
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| 308 | { |
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| 309 | a.a = b.a * c; |
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| 310 | a.b = b.b * c; |
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| 311 | a.c = b.c * c; |
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| 312 | } |
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| 313 | |
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| 314 | |
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| 315 | G4double G4Ray::Vdot(const G4Plane &a, const G4Point3D &b) |
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| 316 | { |
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| 317 | return (a.a * b.x() + |
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| 318 | a.b * b.y() + |
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| 319 | a.c * b.z()); |
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| 320 | } |
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| 321 | |
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| 322 | |
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| 323 | G4double G4Ray::Magsq(const G4Plane &a) |
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| 324 | { |
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| 325 | return ( a.a * a.a + a.b * a.b + a.c *a.c ); |
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| 326 | } |
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| 327 | |
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| 328 | |
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| 329 | G4double G4Ray::Magnitude(const G4Plane &a) |
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| 330 | { |
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| 331 | return (std::sqrt( Magsq( a )) ); |
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| 332 | } |
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