[vtkusers] How to get normals??

[renlishen]

Dear David
thanks for your help.
My question is how can I extract the point normal after I use
vtkMarchingCubes.
If I want to create a sphere using vtkMarchingCubes, I have no idea to get
the point normal on it.
I try to use vtkPolyDataNormals to compute normals, but I don't know how to
get them...
does anyone do me a favor?

thanks!!
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