Hi Andrew, On Thu, May 1, 2014 at 3:31 PM, Andrew Myers <atmyers2@gmail.com> wrote:

Hi Folks,

I'm seeing a strange issue with Chombo data in yt-3.0. This is before any recent changes I made refactoring the frontend. Attached are two images of the same slice through the same dataset, one with yt-3.0 and one with yt-2.6. The image looks fine in yt-2.6, but there are clearly artifacts at the level boundaries for yt-3.0. What's strange is that, if I loop over all the grids and dump out the density, I get *exactly* the same answers for 3.0 and 2.6. It's almost like there is some kind of additive blending thing going on for the 3.0 slice plots, though.

I'm a bit at a loss for where to look for this. Has anyone seen something like this before?

My first suspicion is that there's an improper masking going on -- that coarse grids have no child masks. Can you run this diagnostic: 2.6: sum(g.child_mask.sum() for g in pf.h.grids) 3.0: sum(g.child_mask.sum() for g in ds.index.grids) Also looking at things like the .quantities.total_quantity("cell_volume") would help. -Matt

Thanks, Andrew

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