G4RandomDirection.hh File Reference

#include <CLHEP/Units/PhysicalConstants.h>
#include "globals.hh"
#include "Randomize.hh"
#include "G4ThreeVector.hh"

Go to the source code of this file.

Functions
G4ThreeVector	G4RandomDirection ()

Function Documentation

G4ThreeVector G4RandomDirection ( )

inline

Definition at line 55 of file G4RandomDirection.hh.

References G4UniformRand, and CLHEP::Hep3Vector::unit().

Referenced by G4MuMinusCapturePrecompound::ApplyYourself(), G4MuonMinusBoundDecay::ApplyYourself(), XPhononStackingAction::ClassifyNewTrack(), G4PionDecayMakeSpin::DaughterPolarization(), export_G4RandomDirection(), G4LambertianRand(), XPrimaryGeneratorAction::GeneratePrimaries(), G4PhononScattering::PostStepDoIt(), G4eeTo3PiModel::SampleSecondaries(), G4HeatedKleinNishinaCompton::SampleSecondaries(), and XPrimaryGeneratorAction::XPrimaryGeneratorAction().

{
  G4double cosTheta  = 2.*G4UniformRand()-1.;
  G4double sinTheta2 = 1. - cosTheta*cosTheta;
  if( sinTheta2 < 0.)  sinTheta2 = 0.;
  G4double sinTheta  = std::sqrt(sinTheta2); 
  G4double phi       = CLHEP::twopi*G4UniformRand();
  return G4ThreeVector(sinTheta*std::cos(phi),
                       sinTheta*std::sin(phi), cosTheta).unit(); 
}