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

[Peter Debuchev]

Thanks for the reply, but vtkNetworkAccessManager::ProcessEvents() is
already called in the attached example every 100ms repeatedly until it
returns false.
See my code at Callback::Execute(). The Timer Callback is started towards
the end of main.cxx, where it says "Callback *timer=Callback::New();" and
the following lines.

If you run the example as described, you'll see that actually a number of
messages are processed (their number is being logged). But I don't know how
I can print the content of the received vtkSMMessages for debugging
purposes. And I don't know what else to do so that the custom client's
camera will be affected.

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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