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: G4Ray.hh,v 1.9 2006/06/29 18:40:21 gunter Exp $ |
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28 | // GEANT4 tag $Name: HEAD $ |
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29 | // |
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30 | // ---------------------------------------------------------------------- |
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31 | // Class G4Ray |
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32 | // |
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33 | // Class description: |
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34 | // |
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35 | // Definition of a generic ray. |
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36 | |
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37 | // Authors: J.Sulkimo, P.Urban. |
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38 | // Revisions by: L.Broglia, G.Cosmo. |
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39 | // ---------------------------------------------------------------------- |
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40 | #ifndef __G4Ray_h |
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41 | #define __G4Ray_h 1 |
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42 | |
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43 | #include "G4Point3D.hh" |
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44 | #include "G4PointRat.hh" |
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45 | #include "G4Vector3D.hh" |
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46 | #include "G4Plane.hh" |
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47 | |
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48 | |
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49 | class G4Ray |
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50 | { |
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51 | |
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52 | public: // with description |
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53 | |
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54 | G4Ray(); |
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55 | G4Ray(const G4Point3D& start0, const G4Vector3D& dir0); |
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56 | ~G4Ray(); |
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57 | // Contructors and destructor. |
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58 | |
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59 | inline G4Point3D GetPoint(G4double i) const; |
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60 | inline G4double GetPPoint(const G4Point3D& p) const; |
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61 | inline const G4Vector3D& GetDir() const; |
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62 | inline const G4Point3D& GetStart() const; |
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63 | inline void SetDir(const G4Vector3D& dir0); |
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64 | inline void SetStart(const G4Point3D& start0); |
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65 | const G4Plane& GetPlane(G4int number_of_plane) const; |
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66 | // Get/Set methods of geometrical data. |
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67 | |
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68 | void RayCheck(); |
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69 | // Makes sure that the vector has unit length. |
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70 | |
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71 | void CreatePlanes(); |
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72 | // Creates two orthogonal planes (plane1,plane2), the ray (rray) |
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73 | // being situated in the intersection of the planes. The planes are |
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74 | // used to project the surface (nurb) in two dimensions. |
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75 | |
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76 | static G4int CalcPlane3Pts( G4Plane& plane, const G4Point3D& a, |
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77 | const G4Point3D& b, const G4Point3D& c ); |
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78 | // Finds the equation of a G4Plane that contains three points. |
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79 | // Note that Normal vector created is expected to point outside. |
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80 | // This follows the outward-pointing Normal convention, and the |
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81 | // right-hand rule for cross products. |
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82 | /* |
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83 | |
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84 | C |
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85 | * |
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86 | |\ |
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87 | | \ |
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88 | ^ N | \ |
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89 | | \ | \ |
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90 | | \ | \ |
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91 | |C-A \ | \ |
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92 | | \ | \ |
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93 | | \ | \ |
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94 | \| \ |
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95 | *---------* |
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96 | A B |
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97 | -----> |
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98 | B-A |
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99 | */ |
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100 | // If the points are given in the order A B C (eg, *counter*-clockwise), |
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101 | // then the outward pointing surface Normal N = (B-A) x (C-A). |
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102 | // |
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103 | // Explicit return value: |
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104 | // 0 OK |
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105 | // -1 Failure. At least two of the points were not distinct, |
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106 | // or all three were colinear. |
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107 | // |
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108 | // Implicit return argument: |
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109 | // plane The G4Plane equation coefficients are stored here. |
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110 | |
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111 | inline G4double P2(G4double x) const; |
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112 | inline G4int NearZero(G4double val, G4double epsilon) const; |
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113 | void MatVecOrtho(register G4Vector3D &out, register const G4Vector3D &in); |
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114 | // Utility methods. |
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115 | |
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116 | inline void Vsetall(G4Vector3D &a, G4double s); |
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117 | // Sets all elements of vector to the same scalar value. |
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118 | |
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119 | static void Vcross(G4Plane &a, const G4Vector3D &b, |
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120 | const G4Vector3D &c); |
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121 | // Cross product of 'b' and 'c'. Stores result in 'a' (G4Plane). |
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122 | |
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123 | static void Vcross(G4Vector3D &a, const G4Vector3D &b, |
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124 | const G4Vector3D &c); |
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125 | // Cross product of 'b' and 'c'. Stores result in 'a' (G4Vector3D). |
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126 | |
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127 | static void Vmove(G4Point3D &a, const G4Point3D &b); |
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128 | // Sets 'a' equal to 'b'. |
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129 | |
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130 | static void Vadd2(G4Point3D &a, const G4Point3D &b, |
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131 | const G4Vector3D &c ); |
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132 | // Adds vector 'c' to 'b'. Stores result in 'a'. |
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133 | |
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134 | static void Vsub2(G4Vector3D &a, const G4Point3D &b, |
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135 | const G4Point3D &c); |
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136 | // Subtracts vector 'c' from 'b'. Stores result in 'a'. |
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137 | |
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138 | static void Vscale(G4Plane& a, const G4Plane& b, G4double c); |
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139 | // Scales vector at `b' by scalar `c'. Stores result in `a'. |
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140 | |
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141 | static G4double Vdot(const G4Plane &a, const G4Point3D &b); |
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142 | // Computes dot product of vectors at `a' and `b'. |
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143 | |
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144 | static G4double Magsq(const G4Plane &a); |
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145 | // Returns scalar Magnitude squared of vector at `a'. |
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146 | |
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147 | static G4double Magnitude(const G4Plane &a); |
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148 | // Returns scalar Magnitude of vector at `a'. |
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149 | |
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150 | public: // without description |
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151 | |
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152 | void Init(const G4Point3D& start0, const G4Vector3D& dir0); |
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153 | // Initialisation of a G4Ray (called by constructor). |
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154 | |
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155 | private: |
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156 | |
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157 | G4Point3D start; |
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158 | G4Vector3D dir; |
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159 | |
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160 | G4double r_min; // entry Dist to bounding sphere |
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161 | G4double r_max; // exit Dist from bounding sphere |
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162 | |
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163 | G4Plane plane1, plane2; |
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164 | |
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165 | }; |
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166 | |
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167 | #include "G4Ray.icc" |
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168 | |
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169 | #endif |
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