[yt-users] yt volume render/AMRKDtree help

[Sam Skillman]

Hi Renyue, John,

Yeah, so that seems like it is the problem.  If you update to the latest yt
your original scripts should work without any transpose=False flags.

Glad to hear the kdtree provided a speedup.  I think it is primarily the
le= and re= flags that help out.  There are even more enhancements coming
soon!

Best,

Sam


On Tue, Jan 8, 2013 at 9:20 AM, John Wise <jwise at physics.gatech.edu> wrote:

> Hi Renyue,
>
> That's great news.  If it's okay with you, I'll update yt to the latest
> version on pleiades, and you can test whether you get the same results
> after the update.
>
> Thanks,
> John
>
>
> On 01/08/2013 12:08 PM, Renyue Cen wrote:
>
>> Hi Sam,
>>
>> your transpose fix DOES change things and it indeed may working now.
>> Here is the first images I got for comparison.
>> I am going to make a few more pictures to see if things are all good.
>> Thanks very much,
>> Best,
>> Renyue
>>
>> 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
>>> <mailto:cen at astro.princeton.**edu <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>
>>>
>>>
>>
> --
> John Wise
> Assistant Professor of Physics
> Center for Relativistic Astrophysics, Georgia Tech
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