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package require vtk
package require vtkinteraction
package require vtktesting
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
vtkLight lgt
# create pipeline
#
vtkMergePoints locator
locator SetDivisions 32 32 46
locator SetNumberOfPointsPerBucket 2
locator AutomaticOff
vtkVolume16Reader v16
v16 SetDataDimensions 64 64
[v16 GetOutput] SetOrigin 0.0 0.0 0.0
v16 SetDataByteOrderToLittleEndian
v16 SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
v16 SetImageRange 1 93
v16 SetDataSpacing 3.2 3.2 1.5
vtkMarchingCubes iso
iso SetInputConnection [v16 GetOutputPort]
iso SetValue 0 1150
iso ComputeGradientsOn
iso ComputeScalarsOff
iso SetLocator locator
vtkVectorNorm gradient
gradient SetInputConnection [iso GetOutputPort]
vtkDataSetMapper isoMapper
isoMapper SetInputConnection [gradient GetOutputPort]
isoMapper ScalarVisibilityOn
isoMapper SetScalarRange 0 1200
isoMapper ImmediateModeRenderingOn
vtkActor isoActor
isoActor SetMapper isoMapper
set isoProp [isoActor GetProperty]
eval $isoProp SetColor $antique_white
vtkOutlineFilter outline
outline SetInputConnection [v16 GetOutputPort]
vtkPolyDataMapper outlineMapper
outlineMapper SetInputConnection [outline GetOutputPort]
vtkActor outlineActor
outlineActor SetMapper outlineMapper
set outlineProp [outlineActor GetProperty]
#eval $outlineProp SetColor 0 0 0
# Add the actors to the renderer, set the background and size
#
ren1 AddActor outlineActor
ren1 AddActor isoActor
ren1 SetBackground 1 1 1
ren1 AddLight lgt
renWin SetSize 250 250
ren1 SetBackground 0.1 0.2 0.4
ren1 ResetCamera
set cam1 [ren1 GetActiveCamera]
$cam1 Elevation 90
$cam1 SetViewUp 0 0 -1
$cam1 Zoom 1.5
eval lgt SetPosition [$cam1 GetPosition]
eval lgt SetFocalPoint [$cam1 GetFocalPoint]
ren1 ResetCameraClippingRange
# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
renWin Render
# prevent the tk window from showing up then start the event loop
wm withdraw .
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