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!



On Tue, Jan 8, 2013 at 9:20 AM, John Wise <jwise@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.


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,

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:


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,


On Jan 7, 2013 10:11 AM, "Renyue Cen" <cen@astro.princeton.edu
<mailto:cen@astro.princeton.edu>> wrote:


    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.


John Wise
Assistant Professor of Physics
Center for Relativistic Astrophysics, Georgia Tech
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