|Message: Re: GetMomentumDirection please explain||Not Logged In (login)|
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Hello, From your description, it is not clear what are your doubts. The momentum direction is defined with respect to the world frame. It may help you to define a particle with starting direction along one axis and run an event with tracking/verbose 1. This will print you the characteristics of a track in each step, including momentum direction. You can also visualize the track, as it is demonstrated in basic (only in Geant4 9.5) or novice examples. Best regards, Ivana
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