[vtkusers] Multithreading and VTK

[Nigel Nunn]

Hi Ben, 
 
We get a worker thread, which runs the simulation, to build 
Vtk data objects like vtkPoints (geometry), vtkDoubleArray 
(scalars), and vtkUnstructuredGrid (topology).  When a set 
of results is ready, lock a "Results" object, copy the new 
results into the "Results" object, then unlock the "Results". 

The sim then calcs the next set of results, while the GUI 
thread updates the Vtk pipeline with a few Modified()'s. 
 
Nigel 
 
 
> Thank you for the guidance! Then I gather that in order to pull 
> this off as I described, then I would have to derive at least 
> two threadsafe classes: one for the RenderWindowInteractor 
> class, and one for the simulation. These represent the two 
> ends of the pipeline.
> 
> If it's not too much of an imposition--what would you do 
> in my situation? Perhaps you have a better idea. Is there a 
> built-in framework within vtk that I have overlooked, that 
> better handles this problem?
> 
> Because I seek event-driven user control of the camera, and 
> independent updates to the data by a simulation, I can't see 
> any way around the threading issue. Perhaps another process 
> could derive the simulation data, but still that data would 
> have received and processed by end application. That end 
> application would still have to coordinate data updates 
> with events (update requests) received by the UI.
> 
> Thanks,
> Ben Harris
 
 

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