| [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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| [1337] | 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $
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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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