[yt-users] Controlling grid deposition method

[Matthew Turk]

Yup!

On Sun, Jul 26, 2015, 3:12 PM Brian O'Shea <bwoshea at gmail.com> wrote:

> Hi Matt,
>
> Thanks for the quick reply!  Just to make sure I understand what you're
> saying - assuming I create my region with:
>
> my_reg = ds.arbitrary_grid(left, right, dims=[800,1, 800])
>
> if I were to do:
>
> dmdens = my_reg[("deposit", "all_density")]
>
> gets me a NGP-deposited density of all particles, and
>
> dmdens = my_reg[("deposit", "all_cic")]
>
> will get me the CIC-deposited density?
>
> Brian
>
>
>
>
>
> On Sun, Jul 26, 2015 at 4:08 PM, Matthew Turk <matthewturk at gmail.com>
> wrote:
>
>> Hi Brian,
>>
>> "density" as a suffix instead of "cic" will go to NGP.
>>
>> Matt
>>
>> On Sun, Jul 26, 2015, 2:48 PM Brian O'Shea <bwoshea at gmail.com> wrote:
>>
>>> Hi folks,
>>>
>>> I'm making a movie of dark matter density from an Enzo simulation, and
>>> am doing so using the arbitrary_grid mechanism.  However, when I'm making
>>> the movies, I get some annoying flickering in the color map at early
>>> times.  As an example, look at the first 3 Gyr or so of this movie
>>> (warning: 122 mb):
>>>
>>>
>>> http://galactica.pa.msu.edu/~bwoshea/data/cosmo_zoom_movies/dm_dens_x_algae.mp4
>>>
>>> I am pretty sure that the flickering is due to an unfortunate interplay
>>> between whatever grid deposition is being used by the arbitrary_grid
>>> functionality and a moving image center.  I'd like to test this theory by
>>> forcing the particles to be deposited in a different way - say, by
>>> nearest-grid-point instead of cloud-in-cell.  Is it possible to do this?  I
>>> can't find anything in the documentation that makes it clear how to do this
>>> with the arbitrary_grid mechanism, but on the other hand there are other
>>> places in yt (the particle plotting tools, for example) where one can
>>> specify ngp vs. cic.
>>>
>>> Any suggestions would be greatly appreciated!
>>>
>>> Thanks,
>>> Brian
>>>
>>> p.s. If anybody's interested, the (hacktacular and ugly) script I'm
>>> using to generate movie frames can be found here:
>>> http://paste.yt-project.org/show/5746/
>>>
>>>
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>>
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