[yt-users] loading Gadget outputs

[Desika Narayanan]

Hey Molly,

I'm not sure about why the Projection plots work but not the Slice plot,
but I can answer at least some of the questions.

When you have gadget/gizmo snapshot split into multiples (i.e.
snapshot_100.0.hdf5, snapshot_100.1.hdf5), you should be able to just load
the '0.hdf5' file, and it will load all of the multiples.

n_ref tells you the maximum number of particles can be in a cell before the
octree stops splitting (so lower number means finer octree splitting).

over_refine_factor > 0 will refine each cell in the octree one extra time
even after the n_ref threshold is met.  Increasing this to 1 or 2 will make
much prettier images, at the cost of memory.

-desika




On Wed, Jul 27, 2016 at 12:50 PM, Molly Peeples <molly at stsci.edu> wrote:

> Hi folks,
>
> I am trying to read in a Gadget output that’s split into 16 hdf5 files
> (fwiw, it’s an EAGLE output, and so “should” be similar to the OWLS
> format). I need to be able to analyze / render the entire output, not just
> one of the pieces, but I haven’t been able to figure out how to actually
> load them (akin to how for Enzo yt figures out that there are a lot of cpu
> outputs in a directory).
>
> I have taken a look at
> http://yt-project.org/doc/cookbook/owls_notebook.html#owls-notebook, but
> even there in the example, it’s just reading in the one output and ignoring
> the other 7 in the example tarball. And there I was having trouble tracking
> down what n_ref and over_refine_factor refer to.
>
> Interestingly, if I load just the single hdf5s, I can get ProjectionPlots
> to work but not SlicePlots (which insist there’s “zero dynamic range” with
> “Min = Max = 0.00000”.)
>
> FWIW, yt.__version__ gives me 3.3.1. (And major thanks to Nathan for
> getting *that* installation to go smoothly!!)
>
> Suggestions?
> —Molly
>
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