G3 to G4
Scintillation

Step limitation

• Geant3
  non-existent
  

• Geant4
  Forced - Generation for charged particle if scintillation yield and resolution scale is specified for the tracking material.
  

Final state

• Geant3
  non-existent
  

• Geant4
  random photon emission in angle and uniform along track.
  sample from user specified wavelength spectrum.
  sample from user specified time distribution.