ISISNeutronMuon / ISISNeutronMuon/MDMC
trajectories do not contain velocities
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Description
MDMC `Trajectory` object that is created as part of any MD simulation has zero velocities for all atoms. I suspect it is caused by this line:
https://github.com/MDMCproject/MDMCv0.2_pilot/blob/5ce5ada5a277d3fae846a87786e87d73160c7a6a/MDMC/MD/engine_facades/lammps_engine.py#L483
because it is not actually asking for LAMMPS to dump the velocities, such that when MDMC later converts the trajectory to a `Trajectory` object the velocities are automatically zero:
https://github.com/MDMCproject/MDMCv0.2_pilot/blob/5ce5ada5a277d3fae846a87786e87d73160c7a6a/MDMC/MD/engine_facades/lammps_engine.py#L644
and
https://github.com/MDMCproject/MDMCv0.2_pilot/blob/5ce5ada5a277d3fae846a87786e87d73160c7a6a/MDMC/MD/engine_facades/lammps_engine.py#L576
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