[vtkusers] Streaming Pipeline

[Kevin H. Hobbs]

Mark Bolstad wrote:
>
> That was the idea I originally had, but hadn't explored it further. 
> How are you feeding the extent back to the clip? Viewport -> 
> raster_to_world-> clip ? If you have a small example that would be 
> helpful.
>
> Mark

We use a point picker widget to pick a point on a model around which we 
would like to see image data. Once we have the 3D point we just add the 
radius to the point and convert that to an image extent. Our clip 
function is attached. Our big input image is usually swapped out. If you 
can't have it loaded at all, then you might get better millage with the 
new clip->SetInputConnection(reader->GetOutputPort()), and 
reader->UpdateInformation() style commands.
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