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