using tracking sentence at inization script

[ilikeelec]

hi, when I use tracking , I find that the date from the ionization script the tracking sentence always asking for the argument var_list. But it is not at pre-ionization paticles

[RemiLehe]

Hi @ilikeelec,
It seems that the issue is that the openPMD file does not contain the ID data for the particles (the ID data is required by openPMD-viewer in order to be able to track particles).
It looks like you were maybe using FBPIC here, is that correct? If yes, than you can store the particle ID by using the track method: https://fbpic.github.io/api_reference/particles.html#fbpic.particles.fbpic.particles.Particles.Particles.track
as shown in this example:
https://github.com/fbpic/fbpic/blob/dev/docs/source/example_input/ionization_script.py#L152