[Paraview] Overlapping ParaView windows obscuring each other in ParaViewWeb visualizer server

[Shawn Waldon]

Hi Louise,

I have seen something like this before when using VTK render windows on
Linux with NVidia drivers.  There is a bug/feature in the NVidia driver
where it only renders the part of the window that is shown onscreen.  The
workaround I used at the time was to enable offscreen rendering (which I
think ParaView will do by default in the 5.5 when that is released in a few
months).  In ParaView master/5.5 it will be a command line option too
--force-offscreen-rendering, but I think for 5.4 and earlier you would need
to build ParaView with offscreen rendering enabled and then use that
ParaView for Visualizer.

HTH,
Shawn

On Thu, Oct 12, 2017 at 5:54 AM, <louise.davies at stfc.ac.uk> wrote:

> Hello all,
>
>
>
> I seem to be observing odd behaviour on my ParaViewWeb server, in that the
> server works and a client can see their visualisation window fine provided
> a window does not overlap the ParaView window that is spawned when the user
> connects to the server. If a new user connects, a new ParaView window is
> spawned in the exact same place as the previous one, and the first user now
> sees the image displayed on the second user’s server – seemingly because
> the first user’s ParaView window is underneath the new user’s window.
>
>
>
> It’s not just overlapping ParaView windows either. If I connect to my
> server via VNC and place any window on top, it also obscures the user’s
> view, although it just blacks out the screen and doesn’t show the actual
> window itself to the user. Attached are some screenshots of what I’m trying
> to describe, showing what is happening on the server desktop and what the
> result is in the Visualizer window.
>
>
>
> Any ideas on what could possibly be going wrong would be greatly
> appreciated.
>
>
>
> Kind regards,
>
>
>
> Louise Davies
>
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