how to save simulation and analysis products?

telescope (batoid.optic.CompoundOptic)
- can be stored as / regenerated from, a geom_configs dictionary, that is slow however.
input rays (batoid.RayVector)
- can be stored as / regenerated from, a beam_configs dictionary, that is fast

trace_full, forward_rays, reverse_rays as a set of batoid.RayVector
- I do not know how to store any of that, batoid does not provide any method to save / read batoid.RayVector to / from disk

image on the full camera plane as matplotlib.pyplot.hexbin
- used only for visualization for now

spots data as a pandas.DataFrame, from analysis.make_data_frame
- a data frame with ghost spot data information, including beam and geometry configuration ids
- easy to store on disk in parquet files
ghosts "separation" as a pandas.DataFrame, from the analysis.compute_ghost_separations function
- a data frame with information on ghost spots data separations and ratios
- easy to store on disk in parquet files
ghosts "match" as a pandas.DataFrame, from the analysis.match_ghosts function
- a data frame with the indices of each ghost and nearest ghost, and the distance between the two
- intermediate product, a priori not to be stored
impact points from a beam set as a pandas.DataFrame, from the analysis.simulate_impact_points_for_beam_set function
- a data frame with coordinates of impact points for each beam configuration
- easy to store on disk in parquet files

lsst-camera-dh / ghosts