[vtkusers] About vtkPolyDataNormals....

[renlishen]

I have seen the post "How to extract the average normal from
vtkPolyDataNormals",
and I try to do the same thing
------------------------------------------------------
	vtkPolyDataNormals *triangleCellNormals = vtkPolyDataNormals::New() ;
	triangleCellNormals->SetInput(
triangleCellDataSetSurfaceFilter->GetOutput() ) ;
	triangleCellNormals->ComputeCellNormalsOff() ;
	triangleCellNormals->ComputePointNormalsOn() ;
	triangleCellNormals->ConsistencyOn() ;
	triangleCellNormals->AutoOrientNormalsOn() ;
	triangleCellNormals->Update() ;

	vtkFloatArray *PointNormalArray = vtkFloatArray::SafeDownCast(
triangleCellNormals->GetOutput()->GetCellData()->GetNormals() ) ;
-------------------------------------------------------
My question is ..I can't connect GetCellData() to GetNormals().. 
If the method is wrong, how can I do to get normals?

I can display, but my goal is to get points' normal....
p.s. I am using VTK5.4.2...

thanks for your help~!!
http://old.nabble.com/file/p26420378/1.png 
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