[vtkusers] How to cut a grey slice by using vtkCutter

[diaoxianfen]

Hello every one,
   I am using vtkCutter to extract slices of an image volume.I want to get the grey slice. But I don't know how to do.
Using the following program, I can get the colored slice.

vtkImageMapToColors *mapToColors = vtkImageMapToColors::New();
    mapToColors->SetInput(reader2->GetOutput());//reader->GetOutput()
    mapToColors->SetLookupTable(luk);
    
    vtkCutter *cutter = vtkCutter::New();
    cutter->SetInput(mapToColors->GetOutput());//mapped image volume
    cutter->SetCutFunction(plane);   
       
    vtkPolyDataMapper *cutMapper = vtkPolyDataMapper::New();
    cutMapper->SetInput(cutter->GetOutput());   
   
    vtkActor *cutActor = vtkActor::New();
    cutActor->SetMapper(cutMapper);

However, when using the following program, I still get colored slice.

    vtkCutter *cutter = vtkCutter::New();
    cutter->SetInput(reader2->GetOutput());// original image volume
cutter->SetCutFunction(plane);   
       
    vtkPolyDataMapper *cutMapper = vtkPolyDataMapper::New();
    cutMapper->SetInput(cutter->GetOutput());   
   
    vtkActor *cutActor = vtkActor::New();
    cutActor->SetMapper(cutMapper);

How can get the grey slice?
If you know, please let me know.
Thanks.
Diao xian fen
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