|Message: Re: How to see if a track will intersect a volume before throwing it?||Not Logged In (login)|
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You can invoke G4VSolid::DistanceToIn(p,v) for the solid object of your interested physical volume, where "p" is the offset, i.e. position of a particle w.r.t. the center of the solid, and "v" is the normalized vector of the particle momentum (again w.r.t. the solid). Transformation matrices from world coordinate system to the solid's coordinate system can be obtained by G4VPhysicalVolume::GetTranslation() and G4VPhysicalVolume::GetRotaion(). Obviously, this extraporation does not take into account the effect of multiple scattering, bending power of magnetic field, etc. Alternatively, I would suggest you to shoot your primary anyway. And check if it goes through your interested area before proceeding to the massive calculation of secondaries. ExampleN04 gives you how you can examine the status of your primary at the earliest stage. In this example, four primary muons are examined to go through the muon counters before secondary particles from these muons or other primary particles are processes. If primary muons do not go through the muon counters, the event is aborted and next event starts.
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