[Paraview-developers] Grabbing tiled display output for network streaming

[Utkarsh Ayachit]

Paul,

I think the key place for you is vtkTileDisplayHelper::FlushTiles().
That method is called on the server sides everytime a view renders and
ParaView wants to update the rendered images on to the tile display
screen. vtkTileDisplayHelper already caches all the rendered tile
images that it then posts to the screen. You can intercept this and
you'll be sending these over the network as well/instead.

with 3.14 this won't work well with 2D Charts/Plots, but I'm working
on fixing that as we 'speak' so that will automatically work as well
once those fixes are in.

Utkarsh

On Thu, Mar 15, 2012 at 6:47 AM, Paul Melis <paul.melis at sara.nl> wrote:
> Hi,
>
> I'd like to grab the rendered output from ParaView, specifically when
> running in tiled display mode. The use case here is to run PV in
> parallel on a render cluster in our data center, which then streams the
> output over an optical network to a high-resolution tiled display. This
> tiled display is actually used to show several image sources
> side-by-side and uses the SAGE tiled display rendering framework.
>
> We've been using some(body else's) code based on PV 3.8 that does the
> above, by hacking into vtkIceTRenderManager to intercept the rendered
> images and send them out over the network. I've been looking into
> porting this to a more recent PV but I see the whole render
> infrastructure has been overhauled to be based on VTK views and
> representations.
>
> I've been looking into the PV 3.14 code to see what would be the most
> logical place to add code to intercept rendered images and send them
> out, but I'm getting a bit lost. Any hint where to start hacking would
> be greatly appreciated.
>
> Best regards,
> Paul
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