|Message: Re: identifying physical volumes in a parallel world||Not Logged In (login)|
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I have figured this out: From the TransportationManager I can get the G4Navigator of the parallel world; from that I can get a G4TouchableHistory, and from that I can get the desired pointer to the G4VPhysicalVolume in the parallel world.
By following the prescription in the user's guide I got all this to work. I'm using G4ParallelWorldScoringProcess, even though I have no scoring in the parallel world (some Transportation process is needed in the parallel world, and that is the simplest I found).
I also found a bug that is probably rare except for the way my program behaves: if G4StepLimiter limits the step exactly at the edge of the world volume, with a parallel world and G4ParallelWorldScoringProcess active a fatal exception is generated. As long as the step leaving the world is limited by the CoupledTransportation process all is well, as is the case without a parallel world. I'll report this in the Geant4 bugzilla.