[yt-users] Controlling grid deposition method

Brian O'Shea bwoshea at gmail.com
Sun Jul 26 13:30:11 PDT 2015


Excellent, I'll give this a whirl.  Thank you!

Brian

On Sun, Jul 26, 2015 at 4:27 PM, Matthew Turk <matthewturk at gmail.com> wrote:

> 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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