[yt-users] yt volume render/AMRKDtree help

Renyue Cen cen at astro.princeton.edu
Tue Jan 8 08:38:18 PST 2013

Hi Sam,

I am using the version that John installed on Pleiades.
I got some other unrelated problems with profiling before and John was kind enough to 
revert back to an older version (I think). Anyway, this is what I got:


Separately, I will try your transpose fix and will let you know.

But the KDTree was really smoking fast (50-100 times compared to without) that
makes things very efficient. I would like to thank you for that.

Thanks very much,

On Jan 8, 2013, at 11:25 AM, Sam Skillman wrote:

> Hi Renyue,
> I have actually seen this on one other system but I could never reproduce it. Could you tell me the version of yt you are using? If you run "yt instinfo" it should tell you. I haven't seen this bug for the last few months so I thought it was gone.  
> Additionally, can you try the following at the end of your script:
> im=cam.snapshot('test1.png')
> write_bitmap(im, 'test2.png', transpose=False)
> I think there may have been something wrong with the transposing of the image for a short time period a few months ago.  I have very sporadic and unreliable internet at AAS but I'll try to respond as quickly as possible.
> Sorry for the trouble,
> Sam
> On Jan 7, 2013 10:11 AM, "Renyue Cen" <cen at astro.princeton.edu> wrote:
> Hi,
> I did some simple volume rendering with the following script:
>     volume2 = AMRKDTree(pf, fields=["Dark_Matter_Density"],
>                 no_ghost=False, tree_type="domain",
>                 le=c-0.5*WW, re=c+0.5*WW)
>     cam = pf.h.camera(c, L, W, N, tf, volume=volume2, no_ghost=False,
>                 north_vector=L, steady_north=True)
>     cam.snapshot(fn="%s_iso-DMdensity-%3.3d.png" % (filenameTHIS, j))
> I got rather strange results in that the pictures look symmetric, which I am pretty
> sure can not be true.
> I attach the obtained plot.
> Note that I am using KD tree and using 32 cores. 
> Your help at your earliest convenience is appreciated.
> Best,
> Renyue
> <C15z1600.0043_iso-DMdensity-000.png>

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