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

Tue Jan 4 13:08:17 PST 2011

Here's one I ripped off from Sam Skillman, featuring the rotate function in
the volume render camera.  You'll have to comb through it for any values I
may have hard-coded in that don't apply.
http://paste.enzotools.org/show/1472/

Britton

On Tue, Jan 4, 2011 at 3:51 PM, Elizabeth Harper-Clark <
h-clark at cita.utoronto.ca> wrote:

> 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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