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geant4.10.00.p01
source
global
HEPRandom
include
G4RandomTools.hh
Go to the documentation of this file.
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4RandomTools.hh 67970 2013-03-13 10:10:06Z gcosmo $
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//
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//
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// ---------------------------------------------------------------------------
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// GEANT 4 class header file
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// ---------------------------------------------------------------------------
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// Class description:
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//
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// Utility functions
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// History:
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//
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// 07.11.08 - P.Gumplinger, based on implementation in G4OpBoundaryProcess
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//
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// ---------------------------------------------------------------------------
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#ifndef G4RANDOMTOOLS_HH
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#define G4RANDOMTOOLS_HH
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#include <
CLHEP/Units/PhysicalConstants.h
>
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#include "
globals.hh
"
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#include "
Randomize.hh
"
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#include "
G4RandomDirection.hh
"
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// ---------------------------------------------------------------------------
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// Returns a random lambertian unit vector
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//
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inline
G4ThreeVector
G4LambertianRand
(
const
G4ThreeVector
& normal)
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{
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G4ThreeVector
vect;
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G4double
ndotv;
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do
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{
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vect =
G4RandomDirection
();
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ndotv = normal * vect;
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if
(ndotv < 0.0)
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{
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vect = -vect;
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ndotv = -ndotv;
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}
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}
while
(!(
G4UniformRand
() < ndotv));
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return
vect;
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}
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// ---------------------------------------------------------------------------
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// Chooses a random vector within a plane given by the unit normal
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//
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inline
G4ThreeVector
G4PlaneVectorRand
(
const
G4ThreeVector
& normal)
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{
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G4ThreeVector
vec1 = normal.
orthogonal
();
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G4ThreeVector
vec2 = vec1.
cross
(normal);
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G4double
phi = CLHEP::twopi*
G4UniformRand
();
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G4double
cosphi = std::cos(phi);
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G4double
sinphi = std::sin(phi);
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return
cosphi * vec1 + sinphi * vec2;
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}
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#endif
/* G4RANDOMTOOLS_HH */
CLHEP::Hep3Vector
Definition:
ThreeVector.h:41
G4LambertianRand
G4ThreeVector G4LambertianRand(const G4ThreeVector &normal)
Definition:
G4RandomTools.hh:55
G4RandomDirection
G4ThreeVector G4RandomDirection()
Definition:
G4RandomDirection.hh:55
G4PlaneVectorRand
G4ThreeVector G4PlaneVectorRand(const G4ThreeVector &normal)
Definition:
G4RandomTools.hh:79
G4UniformRand
#define G4UniformRand()
Definition:
Randomize.hh:87
PhysicalConstants.h
Randomize.hh
globals.hh
G4RandomDirection.hh
CLHEP::Hep3Vector::orthogonal
Hep3Vector orthogonal() const
CLHEP::Hep3Vector::cross
Hep3Vector cross(const Hep3Vector &) const
G4double
double G4double
Definition:
G4Types.hh:76
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