|Message: Re: what is the meanning of parameters in the SetParticleMomentumDirection()||Not Logged In (login)|
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Recently I was using this methods to specify the direction of the particle in Geant4.9.6 but there was something I can not understand . After I specify the direction to Z plus plane (defined by SetParticleMomentumDirection ( G4ThreeVector (0,0,1) ) ) , the postion of the particle was not to the plus Z plane but in random direction . Is there any thing wrong while I using this method ? Does the definition I used above could define the particle to directly Z PLUS plane ?