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package require vtk
# Test sub pixel positioning (A round about way of getting an iso surface.)
# See cubed sphere for the surface before sub pixel poisitioning.
vtkSphere sphere
sphere SetCenter 1 1 1
sphere SetRadius 0.9
vtkSampleFunction sample
sample SetImplicitFunction sphere
sample SetModelBounds 0 2 0 2 0 2
sample SetSampleDimensions 30 30 30
sample ComputeNormalsOff
sample Update
vtkThreshold threshold1
threshold1 SetInputConnection [sample GetOutputPort]
threshold1 ThresholdByLower 0.001
vtkGeometryFilter geometry
geometry SetInputConnection [threshold1 GetOutputPort]
vtkImageGradient grad
grad SetDimensionality 3
grad SetInputConnection [sample GetOutputPort]
grad Update
vtkImageMathematics mult
mult SetOperationToMultiply
mult SetInput1Data [sample GetOutput]
mult SetInput2Data [sample GetOutput]
vtkImageToStructuredPoints itosp
itosp SetInputConnection [mult GetOutputPort]
itosp SetVectorInputData [grad GetOutput]
itosp Update
vtkSubPixelPositionEdgels sub
sub SetInputConnection [geometry GetOutputPort]
sub SetGradMapsData [itosp GetOutput]
vtkDataSetMapper mapper
mapper SetInputConnection [sub GetOutputPort]
vtkActor actor
actor SetMapper mapper
# Create renderer stuff
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Add the actors to the renderer, set the background and size
#
ren1 AddActor actor
ren1 ResetCamera
[ren1 GetActiveCamera] Azimuth 20
[ren1 GetActiveCamera] Elevation 30
ren1 SetBackground 0.1 0.2 0.4
renWin SetSize 450 450
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
set cam1 [ren1 GetActiveCamera]
$cam1 Zoom 1.4
iren Initialize
# prevent the tk window from showing up then start the event loop
wm withdraw .
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