[Paraview] ParaViewWeb Visualizer black screen

[Sebastien Jourdain]

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> 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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