[yt-users] Volume rendering error: "No module named extensions.volume_rendering"

Tue Jan 4 12:51:38 PST 2011

Hi Britton,

Works now, thank you :-)

Also - has anyone written a bit of script to smoothly scan around a volume
in a circle starting at an off-axis vector? the one I wrote has bugs in the
trig function usage. I will think on it more but if someone has already done
it and is willing to share that would be great!

Libby

On 4 January 2011 15:44, Britton Smith <brittonsmith at gmail.com> wrote:

> Hi Libby,
>
> The imports have changed since you last used this script.  For the volume
> rendering, you now want
> import yt.visualization.volume_rendering.api as vr
> from yt.visualization.image_writer import write_bitmap
>
> Also, I don't think you need the yt.amr_utils import.
>
> Britton
>
> On Tue, Jan 4, 2011 at 3:39 PM, Elizabeth Harper-Clark <
> h-clark at astro.utoronto.ca> wrote:
>
>> Hi guys,
>>
>> I think I am doing something stupid. I have just returned to try to do
>> some volume rendering and I now get the following error (Script at end of
>> email) (please note: I have no problems with any of my other yt scripts):
>>
>> *[h-clark at tpb4 my_scripts]$ python2.6 VolumeRunNew.py GMCidresbig128a
>> yt         INFO       2011-01-04 15:32:52,325 Loading plugins from
>> /home/h-clark/.yt/my_plugins.py
>> /home/h-clark/YT/lib/python2.6/site-packages/matplotlib/__init__.py:833:
>> UserWarning:  This call to matplotlib.use() has no effect
>> because the the backend has already been chosen;
>> matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
>> or matplotlib.backends is imported for the first time.
>>
>>   if warn: warnings.warn(_use_error_msg)
>> Traceback (most recent call last):
>>   File "VolumeRunNew.py", line 2, in <module>
>>     import yt.extensions.volume_rendering as vr
>> ImportError: No module named extensions.volume_rendering
>> *
>> I tried with the simple volume rendering code in the cookbook too and get
>> the same error. I tried updating yt:
>>
>> *[h-clark at tpb4 yt-hg]$ hg pull
>> pulling from http://hg.enzotools.org/yt/
>> searching for changes
>> adding changesets
>> adding manifests
>> adding file changes
>> added 134 changesets with 198 changes to 91 files (-1 heads)
>> (run 'hg update' to get a working copy)
>> [h-clark at tpb4 yt-hg]$ hg update
>> 75 files updated, 0 files merged, 3 files removed, 0 files unresolved
>> [h-clark at tpb4 yt-hg]$ hg identify
>> 4db47be8e251 (yt) tip*
>>
>> but still get the same error. What am I doing wrong?
>>
>> Thanks,
>>
>> Libby
>>
>>
>>
>> Script:
>>
>> from yt.mods import *
>> import yt.extensions.volume_rendering as vr
>> import numpy as na
>> import yt.amr_utils as au
>> import yt.extensions.image_writer as iw
>>
>> N = 1024
>>
>> pi =
>> 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
>> frame_template = "aaSN/%s/3D3_%04i_%02i.png"
>> #frame_template = "aaWoC/%s/3D3_%04i_%02i.png"
>>
>> alpha_channel = 255*na.ones((N,N,1), dtype='uint8')
>> def save(arr, fn, norm = 0.5):
>>     arr = arr / (norm*arr.max()) # assume min = 0
>>     arr = na.clip( arr*255, 0, 255).astype("uint8")
>>     arr = na.concatenate( [arr, alpha_channel], axis=-1)
>>     au.write_png(arr.copy(), fn)
>>
>> for numb in range(50,51):
>>     print "Numb = ",numb
>>     pf =
>> load(os.path.expanduser("/home/h-clark/my_scripts/SciNet/%s/DD%04i/data%04i"
>> % (sys.argv[-1],numb, numb)))
>>     #pf =
>> load(os.path.expanduser("/home/h-clark/my_scripts/WOCOUT/%s/DD%04i/data%04i"
>> % (sys.argv[-1],numb, numb)))
>>     #c = pf.h.find_max("Density")[1]
>>     c = [0.5,0.5,0.5]
>>     W = 1.0
>>     tf = vr.ColorTransferFunction((-24, -20.0))
>>     dd = pf.h.sphere(c, 0.1)
>>     print dd.quantities["Extrema"]("Density")
>>     hv = vr.HomogenizedVolume(fields = ["Density"], pf = pf)
>>     h5fn = "%s_partitioned.h5" % pf
>>     if not os.path.exists(h5fn):
>>         hv.initialize_source()
>>         hv.store_bricks(h5fn)
>>     else:
>>         hv.load_bricks(h5fn)
>>     tf.add_layers(10, colormap='hot', w=0.03)
>>
>>     for theta in range (0,1):
>>         zeta = 0.8
>>         epz = 0.5
>>         athe = 0.5*pi
>>         aphi = 0.62 + 2*pi*theta/100 #2*pi*phi/20
>>         print athe,aphi
>>         lx = na.sin(athe)*na.cos(aphi)
>>         ly = na.sin(athe)*na.sin(aphi)
>>         lz = na.cos(athe)
>>         print lx,ly,lz
>>         mx = lx*na.cos(zeta) + ly*na.sin(zeta)
>>         my = ly*na.cos(zeta) - lx*na.sin(zeta)
>>         mz = lz
>>         ny = my*na.cos(epz) + mz*na.sin(epz)
>>         nz = mz*na.cos(epz) - my*na.sin(epz)
>>         nx = mx
>>         print "vector:",nx,ny,nz
>>         L = [nx, ny, nz]
>>         cam = vr.Camera(c, L, W, (N,N),
>>                 transfer_function = tf,
>>                 pf = pf, volume = hv, sub_samples=10)
>>         frame = cam.snapshot()
>>         save(frame, frame_template % (sys.argv[-1],numb,theta), norm =
>> 0.5)
>>
>>
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>>
>
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-- 
Elizabeth Harper-Clark MA MSci
PhD Candidate, Astrophysics, UofT

www.astro.utoronto.ca/~h-clark <http://www.astro.utoronto.ca/%7Eh-clark>
h-clark at cita.utoronto.ca
AIM: edphc1
MSN: edphc1 at hotmail.com
Skype: eharperclark
Office phone: 416-978-5759
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