New issue 958: Document detailed cuts on particle chunks https://bitbucket.org/yt_analysis/yt/issue/958/document-detailed-cuts-on-par...

Cameron Hummels:

This is a followup on a conversation from the yt-users email list:

Hi, Everybody-

I have some old code in which I pulled particle ids from grid objects, and I'm porting it to yt3.0.

My old code used a "cut mask" defined like the following:

#!python

for grid in data._grids:
    cut_mask= data._get_cut_mask(grid)

I see that grids is now handled through chunks, is there a modern equivalent of the cut_mask? Or, is there a new-and-improved method to get particle ids from complex objects?

The yt-3.0 equivalent using the chunking system looks like this:

http://nbviewer.ipython.org/gist/ngoldbaum/700d2235d24a5faf9d58

Perhaps a note about this functionality should go in the "Particle Filters" section of the docs? http://yt-project.org/docs/dev/analyzing/filtering.html#filtering-particle-f...

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