|Message: Re: Problems with GetCopyNo() and russian dolls volumes!!!||Not Logged In (login)|
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From Geant4 FAQ, accessible from User Support (http://geant4.cern.ch/support/faq.shtml#a-geometry)
How can I identify the exact copy-number of a specific physical volume in my mass geometry? I tried with GetCopyNo() from my physical volume pointer, but it doesn't seem to work!
Solution: The correct way to identify -uniquely- a physical volume in your mass geometry is by using the touchables (see also section 4.1.5 of the User's Guide for Application Developers), as follows:
G4Step* aStep = ..; G4StepPoint* preStepPoint = aStep->GetPreStepPoint(); G4TouchableHandle theTouchable = preStepPoint->GetTouchableHandle(); G4int copyNo = theTouchable->GetCopyNumber(); G4int motherCopyNo = theTouchable->GetCopyNumber(1);