The commands of dnaphysics

Dear friends,

What’s the difference between “/process/em/AddDNARegion World DNA_Opt0” and “/dna/test/addPhysics DNA_Opt0” in the file of “”. Using the two commands gives different results.
The other is

Thanks for your reply.


the idea of “/process/em/AddDNARegion” is used to make a G4Region (small volume) for Geant4-DNA physics that should inside a bigger volume for Geant4 EM physics.

“/dna/test/addPhysics” is to add physics constructors

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Thanks for your reply. If the volume is World, is the code of “/process/em/AddDNARegion” as well as the “/dna/test/addPhysics”? I tried to verify that, but the results are different.

Best regards.