# This is a simple volume rendering example that
# uses a vtkVolumeRayCast mapper

package require vtk
package require vtkinteraction

# Create the standard renderer, render window
# and interactor
vtkRenderer ren1
vtkRenderWindow renWin
    renWin AddRenderer ren1
vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin

# Create the reader for the data
vtkStructuredPointsReader reader
    reader SetFileName "$VTK_DATA_ROOT/Data/ironProt.vtk"

# Create transfer mapping scalar value to opacity
vtkPiecewiseFunction opacityTransferFunction
    opacityTransferFunction AddPoint  20   0.0
    opacityTransferFunction AddPoint  255  0.2

# Create transfer mapping scalar value to color
vtkColorTransferFunction colorTransferFunction
    colorTransferFunction AddRGBPoint      0.0 0.0 0.0 0.0
    colorTransferFunction AddRGBPoint     64.0 1.0 0.0 0.0
    colorTransferFunction AddRGBPoint    128.0 0.0 0.0 1.0
    colorTransferFunction AddRGBPoint    192.0 0.0 1.0 0.0
    colorTransferFunction AddRGBPoint    255.0 0.0 0.2 0.0

# The property describes how the data will look
vtkVolumeProperty volumeProperty
    volumeProperty SetColor colorTransferFunction
    volumeProperty SetScalarOpacity opacityTransferFunction
    volumeProperty ShadeOn
    volumeProperty SetInterpolationTypeToLinear

# The mapper / ray cast function know how to render the data
vtkOpenGLVolumeShearWarpMapper  volumeMapper
   volumeMapper SetInputConnection [reader GetOutputPort]
	volumeMapper FastClassificationOn
	volumeMapper SetFunctionTypeToComposite

# The volume holds the mapper and the property and
# can be used to position/orient the volume
vtkVolume volume
    volume SetMapper volumeMapper
    volume SetProperty volumeProperty

	vtkCamera cam
	cam ParallelProjectionOn

ren1 SetActiveCamera cam
ren1 AddVolume volume
ren1 SetBackground 1 1 1
renWin SetSize 600 600

ren1 ResetCamera
renWin Render

proc TkCheckAbort {} {
  set foo [renWin GetEventPending]
  if {$foo != 0} {renWin SetAbortRender 1}
}
renWin AddObserver AbortCheckEvent {TkCheckAbort}

iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren Initialize

wm withdraw .