Installing VMTK directly into a Python Distro, e.g., Enthought's EPD

[Adamos Kyriakou]

Hi all,

I'm trying to install VMTK directly into an existing Python distribution, namely Enthought's EPD. I've installed VMTK's latest stable Win7 x64 release on my machine and I've been trying to make it work on my EPD distro (EPD v7.3-2 with Python v2.7.3 and VTK v5.6.0). Now VTK imports fine of course and I set the 'PATH' environment variable according to the post 'using vmtk on windows7' i.e.

PATH
  C:\Program Files\vmtk\Install\bin;
  C:\Program Files\vmtk\Install\lib;
  C:\Program Files\vmtk\Install\lib\vtk-5.8;
  C:\Program Files\vmtk\Install\lib\vmtk;
PYTHONPATH
  C:\Program Files\vmtk\Install\lib\vmtk;
  C:\Program Files\vmtk\Install\bin\Python;

However when I'm trying:

>> from vmtk import vtkvmtk

I get a 'no module named vmtk' error. Am I missing something?

Thanks a lot!

Adam

[Luca Antiga]

Hi Adamos,

 sorry for the late reply. 

I must say I have no experience with the EPD distribution. The binary vmtk installer has been created by linking to a specific version of Python and VTK, the latter built with the native Python wrappers, and I'm not sure this is the same version and mechanism used in EPD.

Can you please post (verbatim) the result of 

from vmtk import pypes

from vmtk import vmtkscripts

from vmtk import vtkvmtk

I hope I can get some more information from the error messages.

Luca

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[Adamos Kyriakou]

Hi Luca,

thanks a lot for getting back to me, the EPD isn't really any different than any other distro, it just bundles everything together so you don't have to go around pipping packages or building them. When I use the %env magic in iPython I get (a huge print but here are the paths):

'PATH': 'C:\\Users\\adam\\AppData\\Local\\Enthought\\Canopy\\User\\Scripts;C:\\Users\\adam\\AppData\\Local\\Programs\\LLNL\\VisIt 2.6.2;C:\\Python27;C:\\Python27\\Scripts; C:\\Program Files\\vmtk\\Install\\bin; C:\\Program Files\\vmtk\\Install\\lib\\vmtk; C:\\Program Files\\vmtk\\Install\\lib\\vtk-5.8; '
'PYTHONPATH': 'C:\\Program Files\\vmtk\\Install\\bin; C:\\Program Files\\vmtk\\Install\\lib\\vmtk; C:\\Program Files\\vmtk\\Install\\lib\\vtk-5.8;'

So in the same session I've tried 

from vmtk import pypes
from vmtk import vmtkscripts
from vmtk import vtkvmtk

And I get

from vmtk import pypes
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
C:\Windows\<ipython-input-1-78716b740622> in <module>()
----> 1 from vmtk import pypes
ImportError: No module named vmtk

from vmtk import vmtkscripts
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
C:\Windows\<ipython-input-4-da5e9b60aba0> in <module>()
----> 1 from vmtk import vmtkscripts
ImportError: No module named vmtk
from vmtk import vtkvmtk
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
C:\Windows\<ipython-input-5-6273140635ec> in <module>()
----> 1 from vmtk import vtkvmtk
ImportError: No module named vmtk

 

So really I'm not sure what I'm missing here. Any ideas?

Thanks a whole bunch!

Adam

 

[Luca Antiga]

Hi Adam,

 I did some experimenting (I'm slowed down by the arrival of a new kid, thanks for your patience). 

I'm attaching a file that you should run with your interpreter. It modifies the environment variables on the fly and tries to import vmtk. Please change the vmtkhome variable to reflect the location where vmtk is currently installed on your system.

You should run it with

python.exe env_vars.py

If the script succeeds, you'll see a list of vmtk class names and the line No errors, success. Otherwise you'll see an error.

In any case, please let me know!

Best,

Luca

web: lantiga.github.io

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twitter: @lantiga

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[Adamos Kyriakou]

Hi Luca,

thanks a lot for your reply and congrats!

I ran your script (after obviously changing the 'home' path) but I'm getting an error being:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)

C:\Python27\lib\site-packages\IPython\utils\py3compat.pyc in execfile(fname, glob, loc)
    166             else:
    167                 filename = fname
--> 168             exec compile(scripttext, filename, 'exec') in glob, loc
    169     else:
    170         def execfile(fname, *where):
C:\Users\adam\Desktop\env_vars.py in <module>()
     12 import vmtk
     13 from vmtk import pypes
---> 14 from vmtk import vtkvmtk
     15 
     16 print dir(vtkvmtk)
C:\Program Files\VMTK\Install\lib\vmtk\vmtk\vtkvmtk.py in <module>()
     15     from libvtkvmtkITKPython import *
     16 else:
---> 17     from vtkvmtkCommonPython import *
     18     from vtkvmtkComputationalGeometryPython import *
     19     from vtkvmtkDifferentialGeometryPython import *
ImportError: DLL load failed: The specified procedure could not be found.

Now I find this really, really weird but perhaps you have an explanation. Also FYI I tried installing vmtk within Slicer and even though the name's listed the package does not exist. Has support ceased?

Best,

Adam

[Luca Antiga]

Hi Adamos,

 it looks like the interpreter failed to load the vtkvmtkCommonPython dll. This could happen for a number of reasons, for instance the Python interpreter is 32 bit while vmtk is 64 bit so the architectures don't match, or vmtk has been linked against one version of VTK but your interpreter sees another version.

Can you verify?

Luca

[Luca Antiga]

Hi Adamos,

 regarding Slicer, I know a lot of progress was done on vmtk in Slicer4, but I have to update on the status of the module.

If something comes up I'll let you know.
Best,

Luca

[Adamos Kyriakou]

Hi Luca,

thanks again for your response and for taking time to sort this out, really appreciate it :)

I can verify that both architectures are x64 but it does seem that the interpreter sees its own VTK version (v5.6.0) and does not necessarily load the one vmtk is linked against. Is there a way to resolve this? Can I link vmtk to whatever VTK I want without building it from source (you know how these things suck on Windows)?

Best,

Adam

[Luca Antiga]

Hi Adamos,

 unfortunately you either prevent the interpreter to find its own VTK 5.6 or you have to build from source. I know, it's 2013 but it's more or less the same thing on all platforms.

Luca