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package require vtk
package require vtkinteraction
# Create the RenderWindow, Renderer and both Actors
vtkRenderer ren1
vtkRenderWindow renWin
renWin SetMultiSamples 0
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# load in the texture map
#
vtkPNMReader imageIn
imageIn SetFileName "$VTK_DATA_ROOT/Data/earth.ppm"
vtkImageLuminance il
il SetInputConnection [imageIn GetOutputPort]
vtkImageCast ic
ic SetOutputScalarTypeToFloat
ic SetInputConnection [il GetOutputPort]
# smooth the image
vtkImageGaussianSmooth gs
gs SetInputConnection [ic GetOutputPort]
gs SetDimensionality 2
gs SetRadiusFactors 1 1 0
# gradient the image
vtkImageGradient imgGradient;
imgGradient SetInputConnection [gs GetOutputPort];
imgGradient SetDimensionality 2
vtkImageMagnitude imgMagnitude
imgMagnitude SetInputConnection [imgGradient GetOutputPort]
# non maximum suppression
vtkImageNonMaximumSuppression nonMax;
nonMax SetMagnitudeInput [imgMagnitude GetOutput];
nonMax SetVectorInput [imgGradient GetOutput];
nonMax SetDimensionality 2
vtkImageConstantPad pad
pad SetInputConnection [imgGradient GetOutputPort]
pad SetOutputNumberOfScalarComponents 3
pad SetConstant 0
vtkImageToStructuredPoints i2sp1
i2sp1 SetInputConnection [nonMax GetOutputPort]
i2sp1 SetVectorInput [pad GetOutput]
# link edgles
vtkLinkEdgels imgLink;
imgLink SetInputConnection [i2sp1 GetOutputPort];
imgLink SetGradientThreshold 2;
# threshold links
vtkThreshold thresholdEdgels;
thresholdEdgels SetInputConnection [imgLink GetOutputPort];
thresholdEdgels ThresholdByUpper 10;
thresholdEdgels AllScalarsOff
vtkGeometryFilter gf
gf SetInputConnection [thresholdEdgels GetOutputPort]
vtkImageToStructuredPoints i2sp
i2sp SetInputConnection [imgMagnitude GetOutputPort]
i2sp SetVectorInput [pad GetOutput]
# subpixel them
vtkSubPixelPositionEdgels spe;
spe SetInputConnection [gf GetOutputPort];
spe SetGradMaps [i2sp GetOutput];
vtkStripper strip
strip SetInputConnection [spe GetOutputPort]
vtkPolyDataMapper dsm
dsm SetInputConnection [strip GetOutputPort]
dsm ScalarVisibilityOff
vtkActor planeActor
planeActor SetMapper dsm
[planeActor GetProperty] SetAmbient 1.0
[planeActor GetProperty] SetDiffuse 0.0
# Add the actors to the renderer, set the background and size
ren1 AddActor planeActor
renWin SetSize 600 300
# render the image
iren Initialize
iren AddObserver UserEvent {wm deiconify .vtkInteract}
renWin Render
[ren1 GetActiveCamera] Zoom 2.8
renWin Render
# prevent the tk window from showing up then start the event loop
wm withdraw .
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