New issue 1172: ParticlePlot does not work on filtered particles https://bitbucket.org/yt_analysis/yt/issues/1172/particleplot-does-not-work-... Yi-Hao Chen: If ParticlePlot is fed with a filtered particle field, it will read the filtered field and try to apply the filter again. I am not sure where the bug is, but at least it affects the ParticlePlot. The bug can be reproduced by the following script derived from the cookbook. ``` import yt from yt.data_objects.particle_filters import add_particle_filter def formed_star(pfilter, data): filter = data["all", "creation_time"] > 0 return filter add_particle_filter("formed_star", function=formed_star, filtered_type='all', requires=["creation_time"]) ds = yt.load('IsolatedGalaxy/galaxy0030/galaxy0030') ds.add_particle_filter('formed_star') p = yt.ParticlePlot(ds, 'particle_position_y', 'particle_position_z', ('formed_star', 'particle_mass')) p.show() ```