[vtkusers] vtkPolyDataNormals how to compute points' normal

[renlishen]

hi everyone
Does anyone knows how the vtkPolyDataNormals to compute the points'
normal..?
like "Marching Cubes: A high resolution 3D surface construction algorithm"
says that?
http://old.nabble.com/file/p26852626/kkk.png 
I really want to know..

thanks again...

renli shen
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