<p>Can you attach your image to the issue? On the mailing list you also said it worked fine I thought. </p>
<div class="gmail_quote">On May 17, 2013 5:01 PM, "Geoffrey So" <<a href="mailto:gsiisg@gmail.com">gsiisg@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">I can confirm, the images I got looks like the grids were not ordered correctly, patches of zones looks fine inbetween, but zone and zones do not match well at the boundary.<div><br></div><div>From</div><div>

G.S.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 17, 2013 at 1:49 PM, Nathan Goldbaum <span dir="ltr"><<a href="mailto:issues-reply@bitbucket.org" target="_blank">issues-reply@bitbucket.org</a>></span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">New issue 570: Healpix volume rendering produces garbled, artifacted images<br>
<a href="https://bitbucket.org/yt_analysis/yt/issue/570/healpix-volume-rendering-produces-garbled" target="_blank">https://bitbucket.org/yt_analysis/yt/issue/570/healpix-volume-rendering-produces-garbled</a><br>
<br>
Nathan Goldbaum:<br>
<br>
Using the sample script from the docs:<br>
<br>
<br>
```<br>
#!python<br>
<br>
from yt.mods import *<br>
import yt.visualization.volume_rendering.camera as camera<br>
<br>
pf = load("IsolatedGalaxy/galaxy0030/galaxy0030")<br>
image = camera.allsky_projection(pf, [0.5,0.5,0.5], 100.0/pf['kpc'], 64, "Density")<br>
camera.plot_allsky_healpix(image, 64, "allsky.png", "Column Density [g/cm^2]")<br>
```<br>
<br>
Produces the following image:<br>
<br>
![](<a href="http://i.imgur.com/5wskzay.png" target="_blank">http://i.imgur.com/5wskzay.png</a>)<br>
<br>
I also tried the manual method described further down in the docs:<br>
<br>
<br>
```<br>
#!python<br>
<br>
rom yt.mods import *<br>
import yt.visualization.volume_rendering.camera as camera<br>
<br>
Nside = 32<br>
pf = load("IsolatedGalaxy/galaxy0030/galaxy0030")<br>
cam = camera.HEALpixCamera([0.5,0.5,0.5], 0.2, Nside, pf = pf, log_fields = [False])<br>
bitmap = cam.snapshot()<br>
<br>
import yt.utilities.lib as au<br>
from numpy import pi<br>
phi, theta = np.mgrid[0.0:2*pi:800j, 0:pi:800j]<br>
pixi = au.arr_ang2pix_nest(Nside, theta.ravel(), phi.ravel())<br>
img = np.log10(bitmap[:,0,0][pixi]).reshape((800,800))<br>
<br>
import matplotlib.figure<br>
import matplotlib.backends.backend_agg<br>
<br>
fig = matplotlib.figure.Figure((10, 5))<br>
ax = fig.add_subplot(1,1,1,projection='mollweide')<br>
image = ax.imshow(img, extent=(-pi,pi,-pi/2,pi/2), clip_on=False, aspect=0.5)<br>
cb = fig.colorbar(image, orientation='horizontal')<br>
<br>
cb.set_label(r"$\mathrm{Column}\/\mathrm{Density}\/[\mathrm{g}/\mathrm{cm}^2]$")<br>
canvas = matplotlib.backends.backend_agg.FigureCanvasAgg(fig)<br>
canvas.print_figure("allsky.png")<br>
<br>
```<br>
Note that I had to update this a bit since amr_utils was renamed a while back.  This produces the following image:<br>
<br>
![](<a href="http://i.imgur.com/Jax1sYB.png" target="_blank">http://i.imgur.com/Jax1sYB.png</a>)<br>
<br>
While this looks more sensible, it's not clear to me that it is correct.<br>
<br>
<br>
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</blockquote></div><br></div>
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