[Paraview-developers] Updating view properties

[Utkarsh Ayachit]

There are multiple ways:

* One way would be listen to the change event in the
vtkSMContextViewProxy (or subclass) which should then call a method on
your vtkPVContextView subclass on all processess using SendStream().
Then in that method you can use BROADCAST to send the message.
* Another way is since EndEvent is only fired on client, you can use
vtkPVSynchronizedWindows::TriggerRMI to trigger an RMI on all the
other processes and then in the callback do the broadcast (look at
vtkSpreadSheetView::FetchBlockCallback, it is does something similar,
the FetchBlock method is called only on the client, but it ensures
that all processes get invovled).

Utkarsh

On Tue, Feb 8, 2011 at 12:59 PM, David Thompson <dcthomp at sandia.gov> wrote:
> Hi all,
>
> Any hints on how one might subclass a ParaView chart view/representation so
> that a pipeline property can get modified when the vtkAxis limits are
> changed (say, by a user panning or zooming the plot)? I want a source which
> to fetch just the things that might be drawn, plus perhaps some padding.
>
> At least one problem is that rendering happens on the client, and thus
> vtkAxis changes aren't available on the servers where the pipeline resides.
> Would overriding vtkPVContextView's Render method to force rendering on the
> servers (even though it would not be used) work? ParaView doesn't seem to
> like updating properties during a client render, or even afterwards in a
> vtkCommand::EndEvent observer attached to the renderer; the server process
> exits with non-zero status when it receives a BROADCAST message instead of
> an RMI message.
>
>        Thanks,
>        David
>
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