[Paraview] ParaViewWeb Visualizer black screen

Tue Oct 10 10:21:32 EDT 2017

Hi Seb,

Thanks for your help. I was indeed having the same behaviour no matter whether I ran Visualizer by the command line. The problem was that my server had a screensaver that when activated made it so that ParaViewWeb could only display a black screen. So for future reference: if anyone else has problems with a pure black screen but no errors – check to see if you have a screensaver blacking out the screen!

Kind Regards,

Louise

From: Sebastien Jourdain [mailto:sebastien.jourdain at kitware.com]
Sent: 02 October 2017 17:09
To: Davies, Louise (STFC,RAL,SC) <louise.davies at stfc.ac.uk>; paraview at paraview.org
Subject: Re: [Paraview] ParaViewWeb Visualizer black screen

Hi Louise,

You are right, there is indeed more changes which might not be strait forward for you to fix. Even if in reality, it is only a bunch of import path to fix.

Just out of curiosity, did you try to run the command line that the launcher is running by hand and see if you have the same behavior as well as maybe other error output?

Otherwise, you right the screen size should be more than enough.

Seb

PS: I've added back the mailing list so others could benefit from our discussion.

On Mon, Oct 2, 2017 at 10:02 AM, <louise.davies at stfc.ac.uk<mailto:louise.davies at stfc.ac.uk>> wrote:
Hi Seb,

The screen size is 1920 x 1080, which seems like it should be sufficiently large enough. It does seem as though that’s the problematic line from the logs though…

I’m currently running 5.4.0 and not the nightly/master so testing out pvbatch over pvpython is difficult. I tried getting the nightly version working but it seems as though there are more changes involved than just that – half the paths I reference are wrong (probably due to stuff changing paths upstream, e.g. launcher.py is in a different location now) and it seems more trouble than it’s worth to test it.

Louise

From: Sebastien Jourdain [mailto:sebastien.jourdain at kitware.com<mailto:sebastien.jourdain at kitware.com>]
Sent: 02 October 2017 14:47
To: Davies, Louise (STFC,RAL,SC) <louise.davies at stfc.ac.uk<mailto:louise.davies at stfc.ac.uk>>
Cc: paraview at paraview.org<mailto:paraview at paraview.org>
Subject: Re: [Paraview] ParaViewWeb Visualizer black screen

Hi Louise,

I'm wondering how big is the display on the remote server? Even if no screen is connected, you do need to define a display size which in your case may be tiny by default?

Otherwise, if you use the nightly binaries or paraview/master, you can tweak your launcher config to use pvbatch instead of pvpython which leverage a true offscreen rendering which will be then independent of the screen resolution. But you will need to set the following environment variable. PV_ALLOW_BATCH_INTERACTION=1

It might also be something else, but the message "window did not resize" looked suspicious.

Seb

On Mon, Oct 2, 2017 at 6:41 AM, <louise.davies at stfc.ac.uk<mailto:louise.davies at stfc.ac.uk>> wrote:
Hello,

I have been trying to set up a ParaViewWeb server on my CentOS 6 machine to run Visualizer. I have gotten to a point where the UI loads correctly but remote rendering only displays a black screen. Not even the axes in the bottom left are displayed. However, if I switch to local rendering mode it works as normal. There are no errors at all in the Apache logs and the session log starts fine but after the twisted server startup and the lines filled with plus signs, I get the lines:

2017-10-02 11:14:48+0100 [_GenericHTTPChannelProtocol,0,127.0.0.1] Client has reconnected, cancelling reaper
2017-10-02 11:14:48+0100 [_GenericHTTPChannelProtocol,0,127.0.0.1] on_connect: connection count = 1
2017-10-02 11:14:48+0100 [-] Property BeginValueCapture has no GetData() method, skipping
2017-10-02 11:14:48+0100 [-] Property CaptureValuesFloat has no GetData() method, skipping
2017-10-02 11:14:48+0100 [-] Property CaptureZBuffer has no GetData() method, skipping
2017-10-02 11:14:48+0100 [-] Property EndValueCapture has no GetData() method, skipping
2017-10-02 11:14:48+0100 [-] Property Send to OpenVR has no GetData() method, skipping
2017-10-02 11:14:48+0100 [-] Property StartCaptureLuminance has no GetData() method, skipping
2017-10-02 11:14:48+0100 [-] Property StopCaptureLuminance has no GetData() method, skipping
Warning: In /home/buildslave/dashboards/buildbot/paraview-pvbinsdash-linux-shared-release_superbuild/build/superbuild/paraview/src/VTK/Rendering/OpenGL2/vtkXOpenGLRenderWindow.cxx, line 1093
vtkXOpenGLRenderWindow (0x3e184d0): warning window did not resize in the allotted time

Since it works with local rendering and not remote rendering I feel as though it must be a problem with OpenGL, but running glxinfo shows that the user running the launcher has access to direct rendering.

Any suggestions on what could possibly be going wrong would be greatly appreciated.

Kind Regards,

Louise

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