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

Tue Jun 12 14:10:49 EDT 2012

In ParaView GUI, each object in the Pipeline Browser is called a source
proxy.  The call to ImageReader() constructs a new source proxy, just like
using File --> Open in the gui.  There is something called the Proxy
Manager which keeps track of the source proxies, whether they are assigned
to python variable names or not.  Each time you load data, through the
ImageReader() call, you are creating a new source proxy that must be
explicitly removed from the Proxy Manager with a call to Delete().
Reassigning the variable will not delete the previous instance.

Pat

On Tue, Jun 12, 2012 at 1:54 PM, Weirs, V Gregory <vgweirs at sandia.gov>wrote:

>  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>
> Date: Tue, 12 Jun 2012 13:03:52 -0400
> To: <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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