|Message: Re: Weighting and counting of particles in detector||Not Logged In (login)|
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An easier way to check if a particle is in a particular volume is through the volume name. Get the volume name of the current physical volume and check if (name == "DetectorPVname"). In this way, you avoid the stepping action's dependency on your geometry.
The seg fault sounds like something wrong in your geometry. Go through it with a fine comb and make sure everything is placed exactly right.