[Paraview] pvpython WriteImage output corrupted

Mon Apr 15 10:17:53 EDT 2013

For what it's worth, I've isolated the seg fault for off screen rendering
using pdb.

I call pvbatch --use-offscreen-rendering simpleTest.py  (I have paraview
built using OSMesa support)

And pdb shows the seg fault during Render() is coming from
servermanager.py(346)__ConvertArgumentsAndCall()
retVal = func(*newArgs)

The simpleTest.py script contains the following:

from paraview.simple import *
import pdb
s = sphere()
Show(s)
pdb.set_trace()
Render()
WriteImage("testimage.png")

Erin

On 4/15/13 9:30 AM, "Taylor, Erin M." <Erin.Taylor at jhuapl.edu> wrote:

>I have tried setting the view.UseOffscreenRendringForScreenshots to 0 with
>no luck.  Still the same corrupted image output.
>
>And I am making a series of images in a loop also.  I am updating the same
>view, however, not deleting and recreating a new one.  I wonder if that
>would work.
>
>Also, in the last few days I've built paraview from source with OSMesa
>support and tried using offscreen rendering, but that results in a seg
>fault at Render().  I must not have it set up properly.  I followed the
>instructions for build with OSMesa support, and it compiled and built
>successfully, but haven't had luck getting the script to run with
>offscreen rendering yet.
>
>Erin
>
>
>
>
>On 4/15/13 9:19 AM, "Masquelet, Matthieu (GE Global Research)"
><masquelet at ge.com> wrote:
>
>>That does not seem to help. On the other hand, I've personally had
>>success by adding a pause (time.sleep(0.5)) in my loop after each
>>Delete(view). Does that help you pinpoint the issue? Note that I use
>>on-screen rendering regardless as I cannot build paraview with OpenMesa
>>on my system at this point.
>>
>>Thanks in advance,
>>
>>Matthieu
>>
>>-----Original Message-----
>>From: Utkarsh Ayachit [mailto:utkarsh.ayachit at kitware.com]
>>Sent: Friday, April 12, 2013 6:38 PM
>>To: Masquelet, Matthieu (GE Global Research)
>>Cc: Taylor, Erin M.; ParaView
>>Subject: Re: [Paraview] pvpython WriteImage output corrupted
>>
>>I wonder if has something to do with the offscreen rendering. Try the
>>following before Writeimage():
>>
>>view.UseOffscreenRenderingForScreenshots = 0
>>
>>Does that help?
>>
>>Utkarsh
>>
>>
>>On Thu, Apr 11, 2013 at 2:37 PM, Masquelet, Matthieu (GE Global
>>Research) <masquelet at ge.com> wrote:
>>> I have experienced similar issues to a lesser level. Say if I'm looping
>>>over 20 files to generate snapshots for a movie, sometimes, 1 or 2 of
>>>these will be corrupted in a fashion similar to what is reported here.
>>>Also using 3.98.1 on Linux 64-bit, writing png files.
>>>
>>> Hope this helps,
>>>
>>> Matthieu
>>>
>>> -----Original Message-----
>>> From: paraview-bounces at paraview.org
>>>[mailto:paraview-bounces at paraview.org] On Behalf Of Taylor, Erin M.
>>> Sent: Thursday, April 11, 2013 11:11 AM
>>> To: Taylor, Erin M.; ParaView
>>> Subject: Re: [Paraview] pvpython WriteImage output corrupted
>>>
>>> I should also add that I can output images from the ParaView GUI in the
>>>linux machine with no problems.  It's just pvpython WriteImage output
>>>that is corrupted.
>>>
>>>
>>>
>>> On 4/11/13 11:08 AM, "Taylor, Erin M." <Erin.Taylor at jhuapl.edu> wrote:
>>>
>>>>Hi all,
>>>>
>>>>I have a pvpython script that I've been developing and running
>>>>successfully on Mac OSX 10.6.8.  It renders a csv data set as points,
>>>>then
>>>>saves an image to file.    It basically boils down to this:
>>>>
>>>>cr = CSVReader()
>>>>cr.FileName = filename
>>>>cr.UpdatePipeline()
>>>>tp = TableToPoints(cr)
>>>>tp.XColumn = 'x'
>>>>tp.YColumn = 'y'
>>>>tp.ZColumn = 'z'
>>>>tp.UpdatePipeline()
>>>>
>>>>Render()
>>>>view = GetRenderView()
>>>>WriteImage(image_path, view, Magnification = 2)
>>>>
>>>>
>>>>This works on the mac using pvpython.  However when I try to run the
>>>>same script on a 64 bit linux machine (same version of paraview,
>>>>3.98.1), the image that is output from WriteImage is corrupted.  By
>>>>that I mean the image is a mess of black and white noise.  Sometimes
>>>>the images have a portion of the script output rendered correctly in a
>>>>tile of the image.  I should note that the image is rendered properly
>>>>in the view window on this linux machine, it is just the saved output
>>>>that is corrupted.  I have tried .png and .jpg image output with the
>>>>same result.
>>>>
>>>>I appreciate any ideas anyone might have on the cause of this!
>>>>
>>>>Many thanks,
>>>>
>>>>Erin
>>>>
>>>>
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>_______________________________________________
>Powered by www.kitware.com
>
>Visit other Kitware open-source projects at
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>Please keep messages on-topic and check the ParaView Wiki at:
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