[vtkusers] Animation Conundrum

[Charlie Moad]

This may not help, but python is picky with the vtk threads.  I
suggest using the "global" keyword in your callback.  I have found it
helps with callbacks in vtk.

def myCallback():
    global jpgReader, atext, renWin
    .....


On 10/7/05, Mischa Thesberg <mejthesb at swri.ca> wrote:
> Are you suggesting a code that is something like this?:
>
>         def myCallback():
>             for i in range(100,260):
>                 #time.sleep(0.03)
>                 givable = "C:/Conics/1-32-04/9-28-2005 1-32-04 PM-0%d" %
> i+".jpg"
>                 jpgReader.SetFileName(givable)
>                 atext.SetInput(jpgReader.GetOutput())
>                 renWin.Render()
>
>         ren.AddActor(triangulation)
>         ren.SetBackground(1, 1, 1)
>         renWin.SetSize(350, 350)
>         iren.AddObserver("TimerEvent", myCallback)
>         iren.Initialize()
>         iren.Start()
>         t = threading.Timer(0.1,myCallback) # call animate after 0.1 seconds
>         t.start()
>
> when this code runs I get the following error from the prompt
>
> ERROR: In \OCCIviewerSDK\Vtk42\Rendering\vtkWin32OpenGLRenderWindow.cxx,
> line 22
> 8
> vtkWin32OpenGLRenderWindow (00B290B0): wglMakeCurrent failed in
> MakeCurrent(), e
> rror: The requested resource is in use.
>
> which seems to me to be a share renderer problem.  Or is my code using
> the wrong idea?  Thank you for your help btw
>
>
> Bruno da Silva de Oliveira wrote:
>
> > 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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> >
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