[vtkusers] How to get normals??

[renlishen]

Thanks for your examples, David~
but now I have a new question
If i want to use this
------------------------
 vtkMarchingCubes *Iso = vtkMarchingCubes::New() ;
 Iso->SetInput(myData) ;
 vtkPolyDataNormals *normals = vtkPolyDataNormals::New();
 normals->SetInput(Iso);
 normals->ComputePointNormalsOn();
 normals->Update();
------------------------
Can I get points' normal by this method?
If I can, how to do ?
Because everytime I get is the wrong normal...

Thanks~
RenLi
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