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

[Elizabeth Harper-Clark]

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)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.spacepope.org/pipermail/yt-users-spacepope.org/attachments/20110104/ee57c515/attachment.htm>