[Paraview] How to extract one face from an hexa in python ?

[houssen]

How to extract one face from an hexa in python ?

I have an hexa read from an xmd file. In the ParaView GUI, I use the 
ExtractSurface filter to get the skin of it. Then I select one face. 
Then I use the ExtractSelection filter : I get the face extracted as I 
need (without error message).

OK, now I need to do that with python scripting : if somebody has the 
corresponding code snippet I'd appreciate to get it (filter creation is 
OK. What I don't know is how to select a face from the hexa surface in 
python). I activated "tools / start trace (+ general option : all 
properties)" to get an idea of the python code. When I create the 
ExtractSurface filter, I get :
Traceback (most recent call last):
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/smtrace.py", 
line 1212, in _create_trace_item_internal
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/smtrace.py", 
line 881, in __init__
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/smtrace.py", 
line 162, in get_accessor
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/smtrace.py", 
line 183, in create_accessor
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/simple.py", 
line 680, in GetActiveSource
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/simple.py", 
line 1690, in get_source
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/simple.py", 
line 1684, in __convert_proxy
     servermanager._getPyProxy(px.GetSourceProxy()),
AttributeError: GetSourceProxy
Then, I select a face and I create an ExtractSelection filter, I get 
another error and ParaView crashes :
Traceback (most recent call last):
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/smtrace.py", 
line 1212, in _create_trace_item_internal
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/smtrace.py", 
line 1063, in __init__
   File 
"/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/site-packages/paraview/servermanager.py", 
line 2418, in _getPyProxy
     xmlName = smproxy.GetXMLName()
AttributeError: GetXMLName
*** Error in 
`/home/houssen/Programs/ParaView/ParaView-v4.3.1-source/local/lib/paraview-4.3/paraview': 
free(): invalid pointer: 0x00007efcddf97240 ***
Abandon (core dumped)

This crash is maybe related to the ParaView build ? I run Ubuntu-14.04, 
ParaView-4.3.1 has been built from source without any specific / triky 
option (or some basic options like cmake 
-DPARAVIEW_INSTALL_DEVELOPMENT_FILES:BOOL=ON 
-DModule_vtkIOXdmf3:BOOL=ON) : do I have to turn on some option(s) at 
build time to avoid the crash ? I attached the CMakeCache file.

Franck
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