[vtkusers] animation loop and interaction

[Akshay Sthapit]

Hi Sean

I have no idea how to implement a repeating timer? callback.  Can you
give some more details, or point me towards some literature/examples? 
This would be extremely helpful.

Thanks!
Akshay

--- Sean McInerney <seanm at nmr.mgh.harvard.edu> wrote:

> If you use a repeating timout callback, you shouldn't need separate
> threads.
> 
> -Sean
> 
> Akshay Sthapit wrote:
> > Hi Alex
> > 
> > What I have done is to add an observer to renderer -
> > 
> > renderer->AddObserver(vtkCommand::StartEvent, myVtkCB);
> > 
> > That way it keeps updating the scene (via a "callback") at a rate
> which
> > you can control, and all you have to do is manipulate ("interact")
> the
> > actors in another thread, and tadaa you got animation.
> > 
> > Here's my vtkCB class -
> > 
> > class vtkCB : public vtkCommand {//Callback to update at every
> graphics
> > loop
> > 	public:
> > 		static vtkCB *New() {
> > 			return new vtkCB; 
> > 		}
> > 		virtual void Execute(vtkObject *caller, unsigned long, void*
> > callData) {
> > 			graphicsInterface->refresh();
> > 		}
> > 		void setup(GraphicsInterface *graphicsInterface) {
> > 			this->graphicsInterface = graphicsInterface;
> > 		}
> > 	private:
> > 			GraphicsInterface *graphicsInterface;
> > };
> > 
> > Hope this helps.
> > 
> > Akshay
> > 
> > 
> > --- Alexandre Popelard <apopelar at enserg.fr> wrote:
> > 
> > 
> >>Hi,
> >>
> >>I have developed a little volume animation under c++ using a simple
> >>loop.
> >>I would now want to be able to interact with the volume during the 
> >>animation. But if I use vtkRenderWindowInteractor and start(), it
> >>stops the 
> >>main animation loop.
> >>If you have any ideas or examples on how to do that, please let me
> >>know.
> >>
> >>Thanks,
> >>Alex
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> > 
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