[vtkusers] Multithreading & vtkRenderWindowInteractor
nNunn at ausport.gov.au
Thu Jan 20 11:41:32 EST 2005
> -----Original Message-----
> From: ttickle [mailto:ttickle at cs.uno.edu]
> Sent: Thursday, 20 January 2005 8:36 AM
> To: vtkusers at vtk.org
> Subject: [vtkusers] Multithreading & vtkRenderWindowInteractor
> I am writing a program which will have realtime updates to the
> displayed data under C++ using VTK under Windows. I have tried using
> a vtkRenderWindowInteractor. Unfortunatly, vtkRenderWindowInteractor
> only seems to preform updates when the user is interacting with the
> scene. I need to refresh the window anytime my data changes. At
> the present time, I am trying to following solution:
> Create the window, interactor, and renderer and associate
> appropriatly. Then create my worker thread whose job it will
> be to periodically update the vtkActors which are being displayed.
> I then start the interactors event loop with interactor->Start();.
> I have tried having the thread update the screne by calling the
> render methods of both vtkRenderWindowInteractor and vtkRenderWindow
> (not at the same time of course). However, I get error messages
> related to something about wgl not being able to make the current
> context. Can anyone show me some code or suggest how I can both
> use an Interactor with a scene that must be updated even when the
> user is not interacting with the data scene?
> Thanks in advance.
> Thomas Tickle
Sounds like you're getting a worker thread to manipulate
vtkActors belonging to a pipeline owned by some object on
A safe way to do this is to store simulation results in
some globally accessible object (protected by appropriate
flags or mutex object), then send a message from the worker
thread to the GUI interface, that new results are available.
Vtk pipelines on the GUI thread can then update themselves.
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