[vtkusers]Have some troubles in Creating 3D visualisation from a series of TIF images

[陈矛]

Hi, all I am having some trouble in creating a visualisation from aseries of tif images.
I took the Medical1.cxx script as a template and edited it.
basically changing the image reader to a TIFFReader.
but when i run the whole thing i always get the folloeing error:
vtkPolyDataNormals (0x0221FC48): No data to generate normals for!
There is 60 images named 001.tif through 060.tif.
they are monochrome 1760x1024 tif images
Can anyone help me?
Thanks a lot, -- Jerry
Here is the script:
  vtkRenderer *aRenderer = vtkRenderer::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
    renWin->AddRenderer(aRenderer);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renWin);  vtkTIFFReader *v16 = vtkTIFFReader::New();
    v16->SetFilePrefix ("");
    v16->SetFilePattern("%s%03d.TIF");
    v16->SetDataExtent(0,1760,0,1024,1,60);    v16->SetDataSpacing(0.8,0.8,4.0);
    v16->SetDataByteOrderToLittleEndian ();
    v16->Update();
  vtkContourFilter *skinExtractor = vtkContourFilter::New();
    skinExtractor->SetInput( (vtkDataSet *) ( v16->GetOutput() ) );
    skinExtractor->SetValue(0, 500);
  vtkPolyDataNormals *skinNormals = vtkPolyDataNormals::New();
    skinNormals->SetInput(skinExtractor->GetOutput());
    skinNormals->SetFeatureAngle(60.0);
  vtkPolyDataMapper *skinMapper = vtkPolyDataMapper::New();
    skinMapper->SetInput(skinNormals->GetOutput());
    skinMapper->ScalarVisibilityOff();
  vtkActor *skin = vtkActor::New();
    skin->SetMapper(skinMapper);  vtkOutlineFilter *outlineData = vtkOutlineFilter::New();
    outlineData->SetInput( (vtkDataSet *) ( v16->GetOutput() ) );
  vtkPolyDataMapper *mapOutline = vtkPolyDataMapper::New();
    mapOutline->SetInput(outlineData->GetOutput());
  vtkActor *outline = vtkActor::New();
    outline->SetMapper(mapOutline);
    outline->GetProperty()->SetColor(0,0,0);   vtkCamera *aCamera = vtkCamera::New();
    aCamera->SetViewUp (0, 0, -1);
    aCamera->SetPosition (0, 1, 0);
    aCamera->SetFocalPoint (0, 0, 0);
    aCamera->ComputeViewPlaneNormal();    aRenderer->AddActor(skin);
    aRenderer->SetActiveCamera(aCamera);
    aRenderer->ResetCamera ();
    aCamera->Dolly(1.5);
   aRenderer->SetBackground(1,1,1);
  renWin->SetSize(640, 480);    aRenderer->ResetCameraClippingRange ();
  iren->Initialize();
  iren->Start();
  v16->Delete();
  skinExtractor->Delete();
  skinNormals->Delete();
  skinMapper->Delete();
  skin->Delete();
  outlineData->Delete();
  mapOutline->Delete();
  outline->Delete();
  aCamera->Delete();
  iren->Delete();
  renWin->Delete();
  aRenderer->Delete();
  
   
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