[vtkusers] problem using vtkRenderWindowInteractor with data updates under Java

[Alan]

Hi,
I'm using vtk4.0 under Linux (RH7.2) with Java:, and I'm trying to find 
a way to allow updates to my volume-rendered data while still allowing 
the user to interact with object via a vtkRenderWindowInteractor .  
After searching this forum, it seems like this may be possible using 
timers and an observer that updates the data, but implementing this has 
proven to be very difficult due to lack of sample code and possibly some 
vtk/X/Java interactions (eg, threading).

Can anyone point me toward a simple example of Java code that allows 
data-updates (eg, to my volume rendered data) while allowing the user to 
manipulate the object via the vtkRenderWindowInteractor?

Thanks much.
  --Alan