Using GetMomentumDirection()

[eyvaz94]

Hi, everyone!

How to use GetMomentumDirection() in the SteppingAction.cc file ?

Best regards,

[rezareiazi]

It depends on where you would like to get your momentum direction. Assuming you need the momentum direction at the pre-step point, you can use the GetMomentumDirection() method of the G4StepPoint class as follow:

G4ThreeVector & prestep_momentum = aStep->GetPreStepPoint()->GetMomentumDirection();

or for track momentum direction:
G4ThreeVector & track_momentum = aStep->GetTrack()->GetMomentumDirection();

or you can get the dynamic particle and then get the momentum direction as follow:

G4ThreeVector & particle_momentum = aStep->GetTrack()->GetDynamicParticle()->GetMomentumDirection();

Good luck