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package require vtk
package require vtkinteraction
# Create the RenderWindow, Renderer and both Actors
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
vtkPoints points
points InsertPoint 0 0.0 0.0 0.0
vtkCellArray verts
verts InsertNextCell 1
verts InsertCellPoint 0
vtkPolyData polyData
polyData SetPoints points
polyData SetVerts verts
vtkPolyDataMapper mapper
mapper SetInputData polyData
vtkActor actor
actor SetMapper mapper
[actor GetProperty] SetPointSize 8
ren1 AddViewProp actor
renWin Render
# prevent the tk window from showing up then start the event loop
wm withdraw .
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