[yt-users] weird square feature in dark matter density slice map

[Matthew Turk]

Hi John,

It can't right now do that, but I've got that on my todo list for the
next week or so.  I haven't yet implemented "smooth" for grid objects.

-Matt

On Thu, May 14, 2015 at 9:52 AM, John Wise <jwise at physics.gatech.edu> wrote:
> Hi Junhwan,
>
> This is an artifact from the cloud-in-cell interpolation.
>
> To anyone else, can yt smooth the DM density field with an SPH kernel?
>
> Another solution is to use Enzo to smooth the DM density internally with the
> command line option, "-M" with the usual "-d -r" flags for a restart and
> debug mode.  This will overwrite the Dark_Matter_Density field with one
> that's smoothed with a standard SPH kernel.  I would perform this operation
> on a copy of the data just in case the process failed, in which case the
> dataset will become corrupted.  Then you would plot "dark_matter_density" in
> yt.
>
> Thanks,
> John
>
>
> On 05/14/2015 10:33 AM, Junhwan Choi (최준환) wrote:
>>
>> Hi yt users,
>>
>> I make a simple dark matter slice map from my enzo simulation output
>> with following script.
>> ==================
>> pc = yt.SlicePlot(ds, "z", ('deposit', 'io_cic'), width = (244.0,
>> 'Mpccm/h'), center=cen_center)
>> pc.annotate_text((0.7,0.9),'z=%4.2f' % ds.current_redshift,
>> coord_system='figure', text_args = text_dict)
>> pc.annotate_velocity(factor=16, scale=None, scale_units=None,
>> normalize=False)
>> pc.save("cen_all_0000")
>> =================
>>
>> I see the weird 5x6 square shapes on the plot.
>> Why this square/cube shape result from and how to remove this?
>>
>> Thank you in advance,
>> Junhwan
>>
>>
>>
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>
> --
> John Wise
> Assistant Professor of Physics
> Center for Relativistic Astrophysics, Georgia Tech
> http://cosmo.gatech.edu
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