[vtkusers] volume cropping

[qlizhi]

Hi All,
I'm trying to take a vtkImageData volume and crop it with the below codes: (the volume data is headsq/quarter)

  vtkSmartPointer<vtkVolumeRayCastMapper> volumeMapper =
    vtkSmartPointer<vtkVolumeRayCastMapper>::New();
  volumeMapper->SetInput(v16->GetOutput());
  volumeMapper->SetVolumeRayCastFunction(rayCastFunction);
  volumeMapper->CroppingOn();
  volumeMapper->SetCroppingRegionPlanes(10,33,10,33,10,33);
  volumeMapper->SetCroppingRegionFlagsToSubVolume();

But what i get is an black widget ???
Best Regards,



qlizhi
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