New issue 837: Deposited Particle filter fields do not show up in derived_field_list https://bitbucket.org/yt_analysis/yt/issue/837/deposited-particle-filter-fie... Nathan Goldbaum: Take the following example script: ``` #!python import yt import numpy as np import pprint from yt.data_objects.particle_filters import add_particle_filter from matplotlib import pyplot as plt def star(pfilter, data): filter = data["all", "particle_type"] == 2 return filter add_particle_filter("star", function=star, filtered_type="all", requires=["particle_type"]) filename = "IsolatedGalaxy/galaxy0030/galaxy0030" ds = yt.load(filename) ds.add_particle_filter("star") pprint.pprint(ds.derived_field_list) ``` While the particle fields for the "star" particle types do show up, only the deposit fields for `"io"` and `"all"` show up under the deposit ptype. The deposit fields for the `"star"` ptype can be accessed through a data object, so the issue seems to be with the way deposit fields are added to the `derived_field_list` rather than the deposit fields themselves.