Problem with volumetric slice plot

[GoogleCodeExporter]

I would like to implement a script for representation of a 4D sample, using 
python language. Then I tested the script of Volumetric Slice Plot shown in 
documentation of Easyviz. The program compiles without wrongs, but the graph 
doesn't appear. I used this script: 



from scitools.std import * 

x, y, z, v = flow()
setp(interactive=False)
h = contourslice(x, y, z, v, seq(1,9), [], [0], linspace(-8,2,10))
axis([0, 10, -3, 3, -3, 3])
daspect([1, 1, 1])
ax = gca()
ax.setp(fgcolor=(1,1,1), bgcolor=(0,0,0))
box('on')
view(3)
show()



What version of the product are you using? On what operating system?
I use Ubuntu 12.4 and the version of python is 2.7.3 

Thak you!!

Original issue reported on code.google.com by [email protected] on 2 Jun 2013 at 8:34

[GoogleCodeExporter]

The code that I was using is actually this:



from scitools.std import * 

x, y, z = ndgrid(seq(-2,2,.2), seq(-2,2,.25), seq(-2,2,.16), sparse=True)
v = x*exp(-x**2 - y**2 - z**2)
xslice = [-1.2, .8, 2]
yslice = 2
zslice = [-2, 0]
slice_(x, y, z, v, xslice, yslice, zslice, colormap=hsv(), grid='off')



Sorry!!

Original comment by [email protected] on 2 Jun 2013 at 9:06

[GoogleCodeExporter]

Which backend did you use? It works fine for me with the VTK backend - the only 
backend that supports the slice_ command.

Original comment by [email protected] on 3 Jun 2013 at 1:36

[GoogleCodeExporter]

I installed the backend vtk (VTK 5.10.1) in my computer and when I compiled the 
script, I had the following error:

Original exception was:
Traceback (most recent call last):
  File "sem título1.py", line 2, in <module>
    import vtk
  File "/usr/local/lib/python2.7/dist-packages/vtk/__init__.py", line 41, in <module>
    from vtkCommonPython import *
ImportError: libvtkCommonPythonD.so.5.10: cannot open shared object file: No 
such file or directory


The code is

from scitools.std import * 
import vtk

x, y, z = ndgrid(seq(-2,2,.2), seq(-2,2,.25), seq(-2,2,.16), sparse=True)
v = x*exp(-x**2 - y**2 - z**2)
xslice = [-1.2, .8, 2]
yslice = 2
zslice = [-2, 0]
slice_(x, y, z, v, xslice, yslice, zslice, colormap=hsv(), grid='off')

Thank you!!

Original comment by [email protected] on 10 Jun 2013 at 8:14

[GoogleCodeExporter]

You should add the path to the location of libvtkCommonPythonD.so.5.10 to 
LD_LIBRARY_PATH. If you installed VTK in /usr/local, this will probably be

export LD_LIBRARY_PATH=/usr/local/lib/vtk-5.10:$LD_LIBRARY_PATH

Original comment by [email protected] on 10 Jun 2013 at 9:06

[GoogleCodeExporter]

Thanks for your answer...
I checked the location of libvtkCommonPythonD and was really 
/usr/local/lib/vtk-5.10 but anyway, when I add export 
LD_LIBRARY_PATH=/usr/local/lib/vtk-5.10:$LD_LIBRARY_PATH , I had the following 
error:

  File "sem título1.py", line 4
    export LD_LIBRARY_PATH=/usr/local/lib/vtk-5.10:$LD_LIBRARY_PATH 
                         ^
SyntaxError: invalid syntax
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 70, in apport_excepthook
    binary = os.path.realpath(os.path.join(os.getcwdu(), sys.argv[0]))
  File "/usr/lib/python2.7/posixpath.py", line 71, in join
    path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 6: ordinal 
not in range(128)

Thanks!

Original comment by [email protected] on 15 Jun 2013 at 8:06

[GoogleCodeExporter]

You need to put the export LD_LIBRARY_PATH statement in your .bashrc file (and 
open a new terminal window) or just run the command in the terminal window 
before running the Python program.

Original comment by [email protected] on 16 Jun 2013 at 3:22

[GoogleCodeExporter]

I did this and was shown a blank picture, with only the coordinate axes...
And other question: is there any way for hasn't this problem using a IDE?
I was using Geany.

Thanks!!

Original comment by [email protected] on 16 Jun 2013 at 6:28

[GoogleCodeExporter]

It is not enough to just do "import vtk". You need to tell SciTools to use the 
VTK backend. See "Controlling the Backend" in the Easyviz documentation:

  https://code.google.com/p/scitools/wiki/EasyvizDocumentation

I have never used Geany, but you must make sure to update the environment 
variable LD_LIBRARY_PATH such that the VTK libraries can be found when running 
Geany:

  http://lmgtfy.com/?q=geany+environment+variables

Maybe a solution would be to start Geany from the same terminal as you defined 
the LD_LIBRARY_PATH variable.

Original comment by [email protected] on 18 Jun 2013 at 10:06