How can I create a time dependent vtkUnstructuredGrid object?

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1

Currently, I’m combining some vtu files that belong to different time snapshots into one vtu file by using this function:

def Combiner(mainfiles,path):
	data_to_write = vtk.vtkUnstructuredGrid()
	writer = vtk.vtkXMLUnstructuredGridWriter()
	writer.SetNumberOfTimeSteps(len(mainfiles))  
	writer.SetInputData(data_to_write)
	writer.SetFileName(path)
	writer.Start()
	for i,filev in enumerate(mainfiles):
		print "Writing Timestep: " + str(i)
  		data_to_write.ShallowCopy(vtkReader(filev))
  		writer.WriteNextTime(i)
	writer.Stop()

	ug = vtkReader(path)

	os.remove(path)

	return ug

As you can see I need to write the combined vtu file and load it again, which is pretty slow. Is there any way to get away with writing stuff into the disk?

2

You could certainly do this with a multi-block file, which you could just update to point to each of the sub-files. But I don’t know how to specify the time steps in that case. I do think that’s possible, though.

In ParaView, sequentially numbered files will be automatically read in as a time-series…

-Aron