|Message: Re: Problem with GetGlobalTime() / GetLocalTime() for optical photons||Not Logged In (login)|
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Do you have a normal dispersive medium (n monotonously increases with frequency) for WLSFiberCore?
Geant4 calculates the group velocity and from this times are calculated/updated. If you have access to your G4 source, I suggest you debug G4Track::GetVelocity() and G4Transportation::AlongStepDoIt (deltaTime)(also read bug report: bug report #741 for an explanation of the method).