[vtkusers] How to get the facet normals from stl file

[Samu]

I use the vtkSTLReader to read the stl file. Here is my code:
vtkSTLReader *vascularSTL = vtkSTLReader::New();
vascularSTL->SetFileName("E:\\courses\\fileinfo\\menjingmai.stl");
vascularSTL->Update();
cout<<"vascularSTL updates complete!"<&lt;endl;

vtkPolyData *vascularData = vascularSTL-&gt;GetOutput();
vascularData->BuildCells();
vascularData->BuildLinks();

but I get the NULL pointers with the codes belowd:
vascularData->GetPointData()->GetNormals()
vascularData->GetPointData()->GetScalars()
vascularData->GetCellData()->GetScalars()
...
Does it mean that the vtkSTLReader is incomplete?? Does VTK have another stl
reader ? Could you give some suggestions?

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