[Paraview] non-interactive viz on cluster

Sun Jul 19 21:46:41 EDT 2015

I am not wanting to do the visualisation using the PBS -X option, which

> will forward the X11 graphics from the compute mnodes to my desktop screen.
>
> I want to do it completely non-interactively.
>

Agreed. Don't forward X, N compute nodes sending their graphics calls over
the network to your desktop is much worse than N times slower.

I could not find any other way of
>
> changing the DISPLAY variable. If there is one, please suggest.
>
>
> I think it is site specific. Talk with your sys admins about how to submit
a job that has access to X displays on the compute nodes.

>  In the meantime, I am trying to find out of the paraview on our cluster
> is
>
> compiled to use off screen rendering. I will also try to have a go at using
>
> some precompiled binaries (pvbatch) if I can find any.
>
>
> Sounds like a good backup plan. If that fails, you can compile paraview
for offscreen rendering yourself and run your own binary.

>  cheers
>
> Sanjay
>
>
good luck!

>
>  ------------------------------
> *From:* David E DeMarle <dave.demarle at kitware.com>
> *Sent:* 18 July 2015 02:08
> *To:* Kharche, Sanjay
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] non-interactive viz on cluster
>
>
> The error message indicates that pv batch can not connect the xwindows.
> If the cluster is configured to run X for you, ensure that the job has the
> correct DISPLAY environment variable.
> If not, you should either start X in the job ("xinit pvbatch" or something
> like that) or recompile paraview to use offscreen rendering.
>
>
> On Saturday, July 18, 2015, Kharche, Sanjay <S.R.Kharche at exeter.ac.uk>
> wrote:
>
>>
>> Dear All
>>
>> I need to non-interactively make png images of a series of sequentially
>> numbered vts/vtk files. Since this is a large amount of data, I would like
>> to do this using a cluster. The cluster has paraview and OpenFoam. I am
>> not
>> very familiar with OpenFoam, and have just started using Paraview in
>> terms of python scripts. When I submit the job, I get an error. I gather
>> that the error is because there is always a blank Paraview OpenGL window
>> that opens when I use the script below. Can someone suggest a solution?
>>
>> thanks
>> Sanjay
>>
>> error from the pbs job:
>> ERROR: In
>> /home/kitware/Kitware/ParaView-3.10/source/VTK/Rendering/vtkXOpenGLRenderWindow.cxx,
>> line 541
>> vtkXOpenGLRenderWindow (0x1ba5ad0): bad X server connection.
>> DISPLAY=ERROR: In
>> /home/kitware/Kitware/ParaView-3.10/source/VTK/Rendering/vtkXOpenGLRenderWindow.cxx,
>> line 343
>> vtkXOpenGLRenderWindow (0x1ba5ad0): bad X server connection. DISPLAY=
>>
>> My python script that I created using the GUI, and then edited for
>> writing the png is below. I run it using the
>> non screen rendering option:
>>
>> pvbatch --use-offscreen-rendering mouse2d.py &
>>
>> mouse2d.py is this:
>>
>> try: paraview.simple
>> except: from paraview.simple import *
>> paraview.simple._DisableFirstRenderCameraReset()
>>
>> # this does not make a difference to the viz.
>> # SetActiveView(GetRenderView())
>> # GetActiveView().UseOffscreenRenderingForScreenshots = 1
>>
>> # loop through all files.
>> for i in range (1,3999):
>>         mouse2D_SAN1_vts = XMLStructuredGridReader(
>> FileName=['mouse2D_SAN%d.vts' % (i)] )
>>         mouse2D_SAN1_vts.PointArrayStatus = ['Unnamed0']
>>         RenderView1 = GetRenderView()
>>         DataRepresentation1 = Show()
>>         DataRepresentation1.EdgeColor = [0.0, 0.0, 0.5000076295109483]
>>         RenderView1.CenterOfRotation = [78.0, 58.5, 0.0]
>>         Transform1 = Transform( Transform="Transform" )
>>         a1_Unnamed0_PVLookupTable = GetLookupTableForArray( "Unnamed0",
>> 1, NanColor=[0.25, 0.0, 0.0], RGBPoints=[-0.01, 0.23, 0.299, 0.754, 1.0,
>> 0.706, 0.016, 0.15], VectorMode='Magnitude', ColorSpace='Diverging',
>> LockScalarRange=1 )
>>         a1_Unnamed0_PiecewiseFunction = CreatePiecewiseFunction()
>>         RenderView1.CameraPosition = [78.0, 58.5, 376.71107225273664]
>>         RenderView1.CameraFocalPoint = [78.0, 58.5, 0.0]
>>         RenderView1.CameraClippingRange = [372.94396153020926,
>> 382.3617383365277]
>>         RenderView1.CameraParallelScale = 97.5
>>         DataRepresentation1.ColorArrayName = 'Unnamed0'
>>         DataRepresentation1.LookupTable = a1_Unnamed0_PVLookupTable
>>         Transform1.Transform = "Transform"
>>         DataRepresentation2 = Show()
>>         DataRepresentation2.ColorArrayName = 'Unnamed0'
>>         DataRepresentation2.LookupTable = a1_Unnamed0_PVLookupTable
>>         DataRepresentation2.EdgeColor = [0.0, 0.0, 0.5000076295109483]
>>         DataRepresentation1.Visibility = 0
>>
>>         Transform1.Transform.Scale = [1.0, -1.0, 0.0]
>>         RenderView1.CenterAxesVisibility = 0
>>         RenderView1.CameraPosition = [78.0, -58.5, 376.71107225273664]
>>         RenderView1.OrientationAxesVisibility = 0
>>         RenderView1.CameraFocalPoint = [78.0, -58.5, 0.0]
>>         RenderView1.CenterOfRotation = [78.0, -58.5, 0.0]
>> #       Render()
>>         WriteImage("dir_%i.png" % (i))
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>
>
> --
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
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