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package require vtk
package require vtkinteraction
vtkXMesaRenderWindow renWin
vtkMesaRenderer ren
renWin AddRenderer ren
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
vtkConeSource cone
vtkMesaPolyDataMapper mp
mp SetInputConnection [cone GetOutputPort]
vtkMesaActor actor
actor SetMapper mp
ren AddActor actor
renWin Render
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize
# prevent the tk window from showing up then start the event loop
wm withdraw .
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