Priority control of tracks
- Use Urgent and Waiting stacks
- perfomant than searching highest
Trace all tracks in the tracking volume before generating shower
- Suspend tracking when a track goes into a calorimeter
- Push suspended tracks into Waiting stack
Optical photons produced by Cherenkov / Scintillation
- Suspend parent track at every step
Looper and long-life particle
- Use PostponeToNextEvent stack
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