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package require vtk
# A script to test the stencil filter.
# removes all but a sphere.
vtkPNGReader reader
reader SetDataSpacing 0.8 0.8 1.5
reader SetDataOrigin 0.0 0.0 0.0
reader SetFileName "$VTK_DATA_ROOT/Data/fullhead15.png"
reader Update
vtkSphere sphere
sphere SetCenter 128 128 0
sphere SetRadius 80
vtkImplicitFunctionToImageStencil functionToStencil
functionToStencil SetInput sphere
functionToStencil SetInformationInput [reader GetOutput]
functionToStencil Update
# test making a copying of the stencil (for coverage)
set stencilOriginal [functionToStencil GetOutput]
set stencilCopy [$stencilOriginal NewInstance]
$stencilCopy DeepCopy [functionToStencil GetOutput]
vtkImageShiftScale shiftScale
shiftScale SetInputConnection [reader GetOutputPort]
shiftScale SetScale 0.2
shiftScale Update
vtkImageStencil stencil
stencil SetInputConnection [reader GetOutputPort]
stencil SetBackgroundInputData [shiftScale GetOutput]
stencil SetStencilData $stencilCopy
$stencilCopy UnRegister stencil
vtkImageViewer viewer
viewer SetInputConnection [stencil GetOutputPort]
viewer SetZSlice 0
viewer SetColorWindow 2000
viewer SetColorLevel 1000
viewer Render
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