|Message: Re: what is the meanning of parameters in the SetParticleMomentumDirection()||Not Logged In (login)|
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It would be easier to think that ux, uy, and uz are unit vectors.
SetParticleMomentumDirection (G4ThreeVector(0,0,1)), which means this. Particle will be shot in the z direction. Then,
G4ThreeVector(1,0,1) :> Particle in the x-z plane with 45 degree.
G4ThreeVector(0,1,1) :> Particle in the y-z plane with 45 degree.
To generate a cone beam, you can generate an apex angle randomly, then apply the angle to SetParticleMomentumDirection.
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