Secondary Generation Location - Without Further Propagation

[Jason_Jonson]

Looks like the answer is here:

Momentum and Time at the Vertex for Primary and Secondary particle

_Geant4 Version: 11.1 _Operating System: Ubuntu 22.04 _Compiler/Version: 11.4.0 _CMake Version: 3.22.1 Hello everyone, I have a muon as a primary particle which travels inside a water Cherenkov detector and emits optical photons. I want to take the momentum and the time of the secondary particle(photon) at the vertex of creation. However, I want to keep this info(momentum and time), only for those photons that arrive at the end of the detector(2 meters). To take the momentum and the time …

Vertex definition could be a bit clearer in the docs.