[Paraview] [EXTERNAL] Simple script severe slowdown in loop

[Weirs, V Gregory]

Try this:

------------
try: paraview.simple
except: from paraview.simple import *
paraview.simple._DisableFirstRenderCameraReset()

count=1

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)

for count in range(2,204):
  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 )

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

From: Andrew Pearson <andrew.j.pearson at gmail.com<mailto:andrew.j.pearson at gmail.com>>
Date: Tue, 12 Jun 2012 13:03:52 -0400
To: <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] [Paraview] Simple script severe slowdown in loop

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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