Yes, the simple explanation is that fields get added when used in the underlying data source.  These fields are used always, when making the image.  So without excluding them, they would always be saved to disk.<br><br><div class="gmail_quote">On Fri Nov 07 2014 at 1:11:29 PM Douglas Harvey Rudd <<a href="mailto:drudd@uchicago.edu">drudd@uchicago.edu</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



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Is there a simple explanation for why they can’t be treated as normal fields and what that refactoring would look like?
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<div>SlicePlot suffers from the same issue for the same reason (it’s getting dropped at the PlotWindow stage).</div>
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<div>Douglas Rudd</div>
<div>Scientific Computing Consultant<br>
Research Computing Center<br>
</div>
<div><a href="mailto:drudd@uchicago.edu" target="_blank">drudd@uchicago.edu</a></div>
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<blockquote type="cite">
<div>On Nov 7, 2014, at 12:58 PM, Nathan Goldbaum <<a href="mailto:nathan12343@gmail.com" target="_blank">nathan12343@gmail.com</a>> wrote:</div>
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<div>This is due to implementation details in the PlotWindow class. It would take some refactoring to allow plotting these fields. Patches welcome :)<br>
<div class="gmail_quote">On Fri, Nov 7, 2014 at 10:56 AM Matthew Turk <<a href="mailto:matthewturk@gmail.com" target="_blank">matthewturk@gmail.com</a>> wrote:<br>
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Yes, this is frustrating, and I have been bitten by it.<br>
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<div class="gmail_quote">On Fri Nov 07 2014 at 12:54:32 PM Douglas Rudd <<a href="mailto:issues-reply@bitbucket.org" target="_blank">issues-reply@bitbucket.org</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
New issue 937: to_pw silently drops some fields<br>
<a href="https://bitbucket.org/yt_analysis/yt/issue/937/to_pw-silently-drops-some-fields" target="_blank">https://bitbucket.org/yt_<u></u>analysis/yt/issue/937/to_pw-<u></u>silently-drops-some-fields</a><br>
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Douglas Rudd:<br>
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to_pw silently drops fields from frb._exclude_fields and _key_fields without notifying the user.<br>
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```<br>
#!python<br>
<br>
>> ds = yt.load("outputs/sedov_000960.<u></u>art")<br>
>> fields = ["density","temperature","dx"]<br>
>> plot = ds.slice(2, ds.domain_center[2]).to_pw(<u></u>fields)<br>
>> print plot.fields<br>
['density', 'temperature']<br>
```<br>
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In this case ('index', 'dx') is in both exclusion lists. Any reason I can't plot a slice of my resolution?<br>
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