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package require vtk
package require vtkinteraction
set file0 idFile0.vti
set file1 idFile1.vti
set file2 idFile2.vti
# read in some image data
vtkImageReader imageReader
imageReader SetDataByteOrderToLittleEndian
imageReader SetDataExtent 0 63 0 63 1 93
imageReader SetDataSpacing 3.2 3.2 1.5
imageReader SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
imageReader Update
# extract to reduce extents of grid
vtkExtractVOI extract
extract SetInputConnection [imageReader GetOutputPort]
extract SetVOI 0 63 0 63 0 45
extract Update
# write just a piece (extracted piece) as well as the whole thing
vtkXMLImageDataWriter idWriter
idWriter SetFileName $file0
idWriter SetDataModeToAscii
idWriter SetInputConnection [extract GetOutputPort]
idWriter Write
idWriter SetFileName $file1
idWriter SetDataModeToAppended
idWriter SetInputConnection [imageReader GetOutputPort]
idWriter SetNumberOfPieces 2
idWriter Write
idWriter SetFileName $file2
idWriter SetDataModeToBinary
idWriter SetWriteExtent 1 31 4 63 12 92
idWriter Write
# read the extracted grid
vtkXMLImageDataReader reader
reader SetFileName $file0
reader WholeSlicesOff
reader Update
vtkImageData id0
id0 DeepCopy [reader GetOutput]
vtkContourFilter cF0
cF0 SetInput id0
cF0 SetValue 0 500
vtkPolyDataMapper mapper0
mapper0 SetInputConnection [cF0 GetOutputPort]
mapper0 ScalarVisibilityOff
vtkActor actor0
actor0 SetMapper mapper0
actor0 SetPosition 180 -60 0
# read the whole image
reader SetFileName $file1
reader WholeSlicesOn
reader Update
vtkImageData id1
id1 DeepCopy [reader GetOutput]
vtkContourFilter cF1
cF1 SetInput id1
cF1 SetValue 0 500
vtkPolyDataMapper mapper1
mapper1 SetInputConnection [cF1 GetOutputPort]
mapper1 ScalarVisibilityOff
vtkActor actor1
actor1 SetMapper mapper1
actor1 SetOrientation 90 0 0
# read the paritally written image
reader SetFileName $file2
reader Update
vtkContourFilter cF2
cF2 SetInputConnection [reader GetOutputPort]
cF2 SetValue 0 500
vtkPolyDataMapper mapper2
mapper2 SetInputConnection [cF2 GetOutputPort]
mapper2 ScalarVisibilityOff
vtkActor actor2
actor2 SetMapper mapper2
actor2 SetOrientation 0 -90 0
actor2 SetPosition 180 -30 0
# Create the RenderWindow, Renderer and both Actors
#
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 actor0
ren1 AddActor actor1
ren1 AddActor actor2
renWin SetSize 300 300
iren Initialize
renWin Render
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# prevent the tk window from showing up then start the event loop
wm withdraw .
file delete -force $file0
file delete -force $file1
file delete -force $file2
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