[Paraview] Server Manager and Python wrapping

[Wiktor Moskwa]

Hello again Andy,

Andy Cedilnik wrote:
> You will need to create interaction layer on top of it. By default
> ParaView ServerManager does not have code to support mouse events. You
> have to do something like:
> 
>   vtkPVGenericRenderWindowInteractor* iren =
>     vtkPVGenericRenderWindowInteractor::SafeDownCast(rm->GetInteractor());
> 
> and then invoke events on iren.

I've managed to make part of it working on a Python level (I got too
many problems with wrapping mixed wxWidgets/VTK C++ class).

So I exposed PVGenericRWI and few other classes through ParaView Python
wrappers. I also made PVGenericRWI fire RenderEvent when it is about
to call Render or EventuallyRender on PVRenderViewProxy. This way
I can setup a Python callback and update render module proxy when
necessary. I've attached a proper patch for ParaView CVS version if 
someone is ineterested.

Now it looks like this:
+---------------+  ----- forwarding events ----->  +--------------+
|  wxVTKRWI.py  |                                  | PVGenericRWI |
+---------------+  <---- render callbacks -------  +--------------+

I also attached a modified wxVTKRenderWindowInteractor.py class with
an example.

But there is still a big problem - when I run this script with
MPI (through pvpython) only data from *one* server is rendered...
I have to admit that I don't understand how Server Manager
composes data from multiple servers yet.
If someone could provide some source of documentation on this subject
I'd appreciate (ParaView book doesn't describe internals).

Best regards,
	Wiktor
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