|Message: Re: only apply field only to one particle and energy range||Not Logged In (login)|
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this fell through the cracks. (I didn't at first know how to answer, and no time, and now almost forgot your post.)
> After profiling my program I've found that most time is spent > calculating the field at each step. I'm using a gravity field derived > from a magnetic field using posts on this site. > > Gravity is negligible for most of the particles I'm interested in. Is > there a way to only call the Field if a particle matches some criteria?
Good question! Since your field inherits from a magn.field, in turn from a G4Field, you'd want to overwrite:
Your aim should be to only execute:
e.g. (fieldExertsForce== true) for the particle you want.
Another approach may be to inherit from and customize a G4FieldManager::GetDetectorField() such that it returns true only when inside a volume with a field AND for a specified particle:
Both of these ideas are not possible from source/geometry/magneticfield directory because there is no dependence on G4DynamicParticle.hh but perhaps from your application's directory.
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