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Suppose I have a cosmological simulation with points in xyz space at a certain redshift in a cube like this:

enter image description here

And I have these for many cubes of different redshifts say from z=0 to z=2. Now I want to generate how that would look to an observer at z=0. In theory, it should look something like this (from SDSS):

enter image description here

Is there any software that creates mock surveys like this? My goal is not just to have hydrodynamic simulations but rather mock catalogs that are similar to the SDSS survey. I found the following paper: https://www.giss.nasa.gov/staff/mway/cluster/cole_mnras_300_945.pdf which seems to be mostly what I'm looking for but I can't find any software for this online (it seems this paper was written in the late 90s).

EDIT: I found the following: https://nbodykit.readthedocs.io/en/latest/catalogs/mock-data.html and it might be what I’m looking for. I will update if this is the case

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    $\begingroup$ I thought that we already were in a cosmological simulation! ;-) $\endgroup$
    – uhoh
    Commented Feb 26, 2021 at 15:12
  • $\begingroup$ You can also ask in a more program oriented SE. Beside cosmological consideration, the task might be similar in other cases/phenomena. $\endgroup$
    – Alchimista
    Commented Feb 27, 2021 at 12:01
  • $\begingroup$ Thank you I probably will do this! $\endgroup$
    – kauii8
    Commented Feb 27, 2021 at 17:27

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