Chris Havlin

After more fiddling this morning, I found that setting the `PYOPENGL_PLATFORM` to `glx` (on Ubuntu, `export PYOPENGL_PLATFORM='glx'`) actually fixes the error for me (using the pyglet backend). So something is...

just confirming, the code snippet from the issue now runs as expected ```python import numpy as np dshp = (16,16,16) data = {'density': np.random.random(dshp)} bbox = np.array([[0, 1000], [-150., -100.],...

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> I'd prefer if we used colatitude instead of theta internally, good idea. would save me from adding comments to remind myself later that theta is colatitude :) I'll make...

mainly a WIP because I found a small bug with an edge case while writing up examples, but feel free to jump in.

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one final note to self so i don't forget: the edge case currently failing is in bbox intersection with a spherical shell and the plane falling on one side of...

> One quick comment now is that I'm not sure about the name: I don't get it at first, and when I do I find myself expecting more than it...

renamed to `YTCartesianCuttingPlane` and `ds.cartesian_cutting`. also fixed the large-element edge case that was causing grid selection to fail in certain cases.

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