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package require vtk
package require vtkinteraction
# Now create the RenderWindow, Renderer and Interactor
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
vtkPNMReader imageIn
imageIn SetFileName "$VTK_DATA_ROOT/Data/B.pgm"
vtkImageGaussianSmooth gaussian
eval gaussian SetStandardDeviations 2 2
gaussian SetDimensionality 2
gaussian SetRadiusFactors 1 1
gaussian SetInputConnection [imageIn GetOutputPort]
vtkImageDataGeometryFilter geometry
geometry SetInputConnection [gaussian GetOutputPort]
vtkClipPolyData aClipper
aClipper SetInputConnection [geometry GetOutputPort]
aClipper SetValue 127.5
aClipper GenerateClipScalarsOff
aClipper InsideOutOn
[[aClipper GetOutput] GetPointData] CopyScalarsOff
aClipper Update
vtkPolyDataMapper mapper
mapper SetInputConnection [aClipper GetOutputPort]
mapper ScalarVisibilityOff
vtkActor letter
letter SetMapper mapper
ren1 AddActor letter
[letter GetProperty] SetDiffuseColor 0 0 0
[letter GetProperty] SetRepresentationToWireframe
ren1 SetBackground 1 1 1
ren1 ResetCamera
[ren1 GetActiveCamera] Dolly 1.2
ren1 ResetCameraClippingRange
renWin SetSize 320 320
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# render the image
#
renWin Render
# prevent the tk window from showing up then start the event loop
wm withdraw .
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