[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: G4Ray.hh,v 1.9 2006/06/29 18:40:21 gunter Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[831] | 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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