[Paraview] vtkSMCollaborationManager::FollowUser(id) doesn't update view

[Peter Debuchev]

Dear Utkarsh,
may I ask you to check again, which step is missing for following another
user's view using collaboration? It is definitely not the missing
ProcessEvents call. This problem is a real show-stopper for my batch
visualization system.

Unfortunately this is documented nowhere, and the comments in the header
files are not sufficient for me to reproduce how the event observation
mechanism is set up in ParaView.

Peter

2016-06-07 16:58 GMT+02:00 Utkarsh Ayachit <utkarsh.ayachit at kitware.com>:

> See pqServer::processServerNotification() [1]. You'll need to call
> vtkNetworkAccessManager::ProcessEvents(..) "on idle" to process events
> being received from the other client.
>
>
> [1]
> https://gitlab.kitware.com/paraview/paraview/blob/master/Qt/Core/pqServer.cxx#L376-401
>
> On Tue, Jun 7, 2016 at 8:54 AM, Peter Debuchev <peterdebuchev at gmail.com>
> wrote:
> > Hello,
> > I have attached a short custom client example which I would like to
> always
> > show the same perspective as a ParaView session connected to the same
> > pvserver.
> >
> > However, although this example renders once the objects that are
> available
> > in the ParaView session, it does not update itself when the camera is
> > changed in ParaView, despite of the line
> > "collaboration->FollowUser(collaboration->GetMasterId());" (see attached
> > code).
> >
> > Apparently I am missing one important step, maybe register the view with
> > some proxymanager, call some *::AddObserver(...) or something similar? I
> > don't know and couldn't find out after several attempts to understand
> > ParaView with the help of a debugger.
> >
> > As a side note: collaboration in the other direction runs successfully.
> If I
> > choose ParaView to follow this custom client by double-clicking on the
> eye
> > symbol in the collaboration panel, then the ParaView view always displays
> > the same perspective as the custom client.
> >
> > Which are the missing steps to have the client update its view, when the
> > (master) ParaView camera changes?
> >
> > Steps to reproduce:
> > + compile attached main.cxx
> > + run "pvserver --multi-clients &"
> > + run "paraview --server-url=cs://localhost:11111 &"
> > + create a simple pipeline in paraview
> > + run "./main" -> same pipeline as in paraview is rendered in custom
> client
> > + interact with view in ParaView -> client view does not update although
> it
> > is expected to follow the master
> >
> > Peter
> >
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