G4RandomDirection.hh File Reference

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

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Functions
G4ThreeVector	G4RandomDirection ()

Function Documentation

G4ThreeVector G4RandomDirection ( )

inline

Definition at line 56 of file G4RandomDirection.hh.

{
  G4double z   = 2.*G4UniformRand() - 1.;  // z = cos(theta)
  G4double rho = std::sqrt((1.+z)*(1.-z)); // rho = sqrt(1-z*z)
  G4double phi = CLHEP::twopi*G4UniformRand();
  return G4ThreeVector(rho*std::cos(phi), rho*std::sin(phi), z);
}

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