[yt-users] Controlling grid deposition method

[Matthew Turk]

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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