[vtkusers] Pointer tracking - Observer/Command vs Win32 Msg cycle.

[Sergio Aguirre]

Hi everyone.



I am attempting to set up a Pointer tracking app to interactively manipulate
some vtk actors in a single scene – ie vtkRenderWindow.



Basically, I now have a simple OpenGL app where, in the Win32 message loop
after translate & dispatch, I go and get the position of my tracked pointer
and render the scene, unless I press the ESC key where I quit the app.



This way basically I have 3D objects continuously rendered and the tracked
tool is continuously interrogated and its corresponding 3D object is updated
in the scene.



However, in terms of VTK I am unsure how to implement this, since a
vtkRenderWindowInteractor will be observing/executing on mouse, key & other
events.



Then I explored on using a vtkWidget (ie vtkLineWidget2) where I could do a
callback function, but 1) its only binded to RenderWindowInteractor events
and mouse events.



Finally, looking at the vtkCommand IDs I could not find something that I
could observe if its not connected either to an interactor or filter after
calling update.



Can anyone recommend a reasonable approach to implement this? I first
thought of creating my own msg loop that would also listen to vtkCommand IDs
– but this seems to be what happens in
vtkWin32RenderWindowInteractor::Start()



Any help, suggestion or reference is appreciated



Sergio
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