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Extract Paraview data (vtkUnstructured Grid) using pvpython

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Old   October 28, 2013, 14:02
Default Extract Paraview data (vtkUnstructured Grid) using pvpython
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I am working with large FE simulation data and I wish to extract information on only coordinates (at different timesteps, precisely a 3xN List of coordinates for every timestep considered or alternatively the displacements, which I know to be stored in a Point Array) and the basic connectivity of the grid into python arrays.
For now, I am working with Paraview in the pvpython-shell and vtk and struggling with finding and arranging the information. So far I used this code to get the coordinates in the beginning (data considered originates from LS-Dyna, hence 3dplot):
import numpy as np 
from paraview import simple  
reader.PartArrays = ['Part1 (Matl2000001)'] 
# reader: <paraview.servermanager.LSDynaReader object at 0x376b5d0>  
data = simple.servermanager.Fetch(reader) 
# data: (vtkMultiBlockDataSet) 
grid = data.GetBlock(0) 
# grid: (vtkUnstructuredGrid) 
npoints = grid.GetNumberOfPoints() 
coord = np.zeros((npoints,3)) 
for i in range(npoints):
  coord[i,:] = np.array(grid.GetPoint(i))
Any ideas on how to proceed from there? That is: Get a matrix of connectivities, and get acess to the data saved in the Point Arrays OR the coordinates at different time steps??
Any help will be appreciated as I am fairly new to this sort of programming.
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Old   November 3, 2013, 07:10
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Greetings lu_siyah and welcome to the forum!

Sorry, I'm a bit confused with your description. Is what you're trying to do similar to what's described on this thread:

Because if I understand you correctly, you want to resample/probe the simulation volume you have from the FE simulation, with an array of point/probe locations.
The part that I don't understand is: why do you need a connectivity matrix?

Best regards,
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pvpython, python, vtk

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