[vtkusers] Animation Conundrum

[Bruno da Silva de Oliveira]

Hi Mischa,

Try to use a timer. Connect an observer in the RenderWindowInteractor 
listening for the TimerEvent, and in this handler change the texture.

HTH,

Mischa Thesberg wrote:

>    This is the same problem I was having before however I still cannot 
> seem to fine a solution to it.  I am simulating the effect of 
> projecting a movie onto a cone by creating a cone object in a render 
> window (with an interactor) and changing the texture (mapped using 
> textureMapToPlane) of the cone about 10 times a second (in other words 
> I loop through a series of sequentially named jpeg's).  The problem is 
> that while this animation is occuring (which is always) the interactor 
> is frozen with an hourglass (or if I put the animation in a 
> rudimentary thread the hourglass is gone but I still can't interact).  
> How do I keep the interactor usable as I constantly change the texture 
> of the cone.  I think a problem with the way I tried to thread has to 
> do with the shared resources between the actor changing textures and 
> the interactor.  If someone could give me some advice it would be much 
> appreciated.  If threading is in fact necessary it would be helpful to 
> have a code snippet or a link to an explicit example.  The pertinent 
> part of my code is below (I have kept all of the commented out stuff 
> just to illustrate the type of stuff I've tried:
>
>        #def myCallback():
>          #  if renWin.GetEventPending():
>            #    renWin.SetAbortRender=1
>
> # Add the actors to the renderer, set the background and size
>        ren.AddActor(triangulation)
>        ren.SetBackground(1, 1, 1)
>        #ren.AddObserver("StartEvent", myCallback)
>        renWin.SetSize(350, 350)
>        #renWin.FullScreenOn()
>        #iren.UpdateSize(700,700)
>        #iren.AddObserver("InteractionEvent", myCallback)
>        iren.Initialize()
>
>        #renWin.Render()
>        iren.Start()
>
>        for i in range(100,260):
>            time.sleep(0.03)
>            #iren.UnRegister(renWin)
>            #iren = None
>            #iren = vtk.vtkRenderWindowInteractor()
>            givable = "C:/Conics/1-32-04/9-28-2005 1-32-04 PM-0%d" % 
> i+".jpg"
>            jpgReader.SetFileName(givable)
>            atext.SetInput(jpgReader.GetOutput())
>            #atext.Render(ren)
>            #ren.Render()
>            renWin.Render()
>            #print iren.GetInitialized()
>            #iren.SetRenderWindow(renWin)
>            #iren.Enable()
>            #iren.Initialize()
>            #iren.Start()
>
>
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-- 
Bruno da Silva de Oliveira
bruno at esss.com.br
ESSS - Engineering Simulation and Scientific Software
http://www.esss.com.br