[vtkusers] simple Maximum Intensity Projection (MIP)

[Thomas Deschamps]

Hi I'm trying to do a simple MIP but it do not work. Here is the code:

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vtkImageReader reader
reader SetFileName "$VTK_DATA/aortaFile3D.vtk"

vtkPiecewiseFunction greyTransferFunction
greyTransferFunction AddSegment  0 1. 255 1.

vtkVolumeProperty volumeProperty
volumeProperty SetColor greyTransferFunction
volumeProperty SetInterpolationTypeToLinear

vtkVolumeRayCastMIPFunction  MIPFunction
MIPFunction SetMaximizeMethodToScalarValue

vtkVolumeRayCastMapper volumeMapper
volumeMapper SetInput [reader GetOutput]
volumeMapper SetVolumeRayCastFunction MIPFunction

vtkVolume volume
volume SetMapper volumeMapper
volume SetProperty volumeProperty
ren1 AddVolume volume
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My image is a 3D MR dataset of 8bits grey values that has already been
used for other things.
What did I forget?

Thanks.

Thomas