[yt-users] yt volume render/AMRKDtree help

John Wise jwise at physics.gatech.edu
Tue Jan 8 09:20:48 PST 2013

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.


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>> 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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