[Paraview] Data set comparison

[Luca.Clementi at tororosso.com]

Hi all,
Im trying to compare two data sets in Ensight .case format. 

I found only this thread referring to data set comparison: 
http://www.cmake.org/pipermail/paraview/2008-November/010034.html

But I could not get it to work. I tried resamply directly the two Ensight 
data reader. Then I also tried to filter the two Ensight data readers 
through a CellDatatoPointData reader and also through a CellCenter (with 
vertex cells active), but I always get:
ERROR: In 
/home/kitware/ParaView3/Utilities/BuildScripts/ParaView-3.6/ParaView3/VTK/Filtering/vtkDataSet.cxx, 
line 406
vtkUnstructuredGrid (0x3a46da0): Point array vtkValidPointMask with 1 
components, only has 3726 tuples but there are 407364 pointsERROR: In 
/home/kitware/ParaView3/Utilities/BuildScripts/ParaView-3.6/ParaView3/VTK/Filtering/vtkDataSet.cxx, 
line 406
vtkUnstructuredGrid (0x67183e0): Point array vtkValidPointMask with 1 
components, only has 3726 tuples but there are 407364 points


ERROR: In 
/home/kitware/ParaView3/Utilities/BuildScripts/ParaView-3.6/ParaView3/VTK/Filtering/vtkExecutive.cxx, 
line 757
vtkCompositeDataPipeline (0x65c0b20): Algorithm 
vtkPVGeometryFilter(0x65bdb80) returned failure for request: 
vtkInformation (0x67155a0)
  Debug: Off
  Modified Time: 13672858
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_DATA
  FROM_OUTPUT_PORT: 0
  ALGORITHM_AFTER_FORWARD: 1
  FORWARD_DIRECTION: 0


I also tried the programmable filter suggested in the previous email, 
(using two input file with the same geometry), but in that case I always 
get:

paraview version 3.6.2, Date: 2009-05-18 

Traceback (most recent call last):
  File "<string>", line 25, in <module>
  File "<string>", line 5, in RequestData
AttributeError: GetPointData


That's the filter Im trying to use:
i0 = self.GetInputDataObject(0,0)
i1 = self.GetInputDataObject(0,1)
o = self.GetOutputDataObject(0)
o.GetPointData().AddArray(i0.GetPointData().GetArray("meanTotalPressureMonitor"))
o.GetPointData().AddArray(i1.GetPointData().GetArray("meanTotalPressureMonitor"))


Thank you very much for your help!

Sincerely,
Luca