[Paraview] Simple script severe slowdown in loop

[Andrew Pearson]

Hi all.  I'm a newbie to both ParaView and Python scripting.  I have a
large number of *.raw files that I wish to load, visualize and save via a
screenshot.  To do this, I used the start/stop trace feature to produce a
python script for one instance, edited the python script by adding a for
loop, then ran it with pvbatch.  The script produces the correct output,
but it takes progressively longer on each iteration.  To give you an idea,
I started a batch of 200 files yesterday afternoon -- the first one took 10
seconds, but right now it's only on 180!  I know that in Matlab, allocating
and re-allocating progressively larger memory chunks in a loop can cause
this behavior, but I don't see this happening here.  Below is my script --
I appreciate any help anyone can give.

for count in range(1,204):
  try: paraview.simple
  except: from paraview.simple import *
  paraview.simple._DisableFirstRenderCameraReset()

  filename='/home/andy/Desktop/L2-1
Dicom/data8/rho_180x180x180_frame%04d_subs01_total.raw' % (count)
  rho_180x180x180_frame0010_subs01_total_raw = ImageReader(
FilePrefix=filename )

  rho_180x180x180_frame0010_subs01_total_raw.DataExtent = [0, 179, 0, 179,
0, 179]
  rho_180x180x180_frame0010_subs01_total_raw.DataScalarType = 'unsigned
char'

  RenderView1 = GetRenderView()
  a1_ImageFile_PVLookupTable = GetLookupTableForArray( "ImageFile", 1,
NanColor=[0.25, 0.0, 0.0], RGBPoints=[0.0, 0.23, 0.299, 0.754, 255.0,
0.706, 0.016, 0.15], VectorMode='Magnitude', ColorSpace='Diverging',
ScalarRangeInitialized=1.0 )

  a1_ImageFile_PiecewiseFunction = CreatePiecewiseFunction( Points=[0.0,
0.0, 0.5, 0.0, 255.0, 1.0, 0.5, 0.0] )

  DataRepresentation1 = Show()
  DataRepresentation1.EdgeColor = [0.0, 0.0, 0.5000076295109483]
  DataRepresentation1.SelectionPointFieldDataArrayName = 'ImageFile'
  DataRepresentation1.ScalarOpacityFunction = a1_ImageFile_PiecewiseFunction
  DataRepresentation1.ColorArrayName = 'ImageFile'
  DataRepresentation1.ScalarOpacityUnitDistance = 1.7320508075688779
  DataRepresentation1.LookupTable = a1_ImageFile_PVLookupTable
  DataRepresentation1.Representation = 'Volume'
  DataRepresentation1.ScaleFactor = 17.900000000000002

  RenderView1.CameraViewUp = [-0.24428917240633777, 0.2192776215931415,
0.9445846308899386]
  RenderView1.CameraPosition = [495.4123489395223, -304.665940440324,
285.97976015645276]
  RenderView1.CameraClippingRange = [296.6155313125564, 980.96172641737]
  RenderView1.CameraFocalPoint = [89.5, 89.50000000000001, 89.5]
  RenderView1.CameraParallelScale = 155.0185472774145
  RenderView1.CenterOfRotation = [89.5, 89.5, 89.5]

  filename_out='/home/andy/Desktop/L2-1 Dicom/data8/frame_%04d.bmp' %
(count)
  WriteImage(filename_out)
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