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<p>New issue 1209: Covering grids do not fill data outside domain boundaries for a periodic simulation <a href="https://bitbucket.org/yt_analysis/yt/issues/1209/covering-grids-do-not-fill-data-outside">https://bitbucket.org/yt_analysis/yt/issues/1209/covering-grids-do-not-fill-data-outside</a></p>

<p>Nathan Goldbaum:</p>

<p>The following test script (adapted from a script provided to me by Marco Surace):</p>

<p><a href="http://paste.yt-project.org/show/6396/">http://paste.yt-project.org/show/6396/</a></p>

<p>Produces the following image:</p>

<p>![test.png](<a href="https://bitbucket.org/repo/BXbAb/images/1362080846-test.png">https://bitbucket.org/repo/BXbAb/images/1362080846-test.png</a>)</p>

<p>Since this simulation uses periodic boundary conditions, I would expect the data to be periodically mirrored even though we are selecting data outside the domain boundaries.</p>


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