[Paraview] PVPython: paraview.vtk not the same as vtk

[Hal Canary]

I've got a question concerning ParaView and VTK Python scripts.  My goal 
is to generate some test data in the form of .vti files.  Using the VTK 
Python module, I can run the following script to generate a test datafile:

	#!/usr/bin/env python
	import vtk

	da = vtk.vtkFloatArray()
	da.SetName('myarray')
	da.SetNumberOfComponents(1)
	da.SetNumberOfTuples(1000)
	for i in xrange(1000):
		da.SetComponent(i,0,99.9)
	print da.GetClassName()

	image = vtk.vtkImageData()
	image.SetDimensions(10,10,10)
	image.GetPointData().AddArray(da)

	writer = vtk.vtkXMLImageDataWriter()
	fn = '/tmp/out.vti'
	writer.SetFileName(fn)
	writer.SetInput(image)
	writer.Update()


To speed things up, I want to use the vtk.dataset_adapter submodule from 
the ParaView Python libraries.  The function numpyTovtkDataArray   will 
translate a numpy array into a vtkDataArray.  This should speed thigns 
up considerably.

	#####################
	## run with pvpython
	#####################
	import paraview.vtk.dataset_adapter
	import paraview.vtk
	import numpy

	na = numpy.zeros((1000,), dtype=numpy.float32)
	na[:] = 99.9
	da = paraview.vtk.dataset_adapter.numpyTovtkDataArray(na)
	da.SetName('myarray')
	print da.GetClassName()

	image = paraview.vtk.vtkImageData()
	image.SetDimensions(10,10,10)
	image.GetPointData().AddArray(da)

	writer = paraview.vtk.vtkXMLImageDataWriter()
	writer.SetFileName('/tmp/out.vti')
	writer.SetInput(image)
	writer.Update()
	#####################

Unfortunately, this tends to fail because 
paraview.vtk.vtkXMLImageDataWriter does not exist.

The only way I can get this to work is to install both VTK and ParaView 
and mix calls to the paraview.vtk the vtk modules.  This seems 
redundant.  Is there a better way?

Thanks,

-- 
Hal Canary