[vtkusers] structured grid -> normals at points

[John Hunter]

>>>>> "Amy" == Amy Henderson <amy.henderson at kitware.com> writes:

    Amy> Take a look at vtkPolyDataNormals.  The on-line documentation
    Amy> for that class is here:
    Amy> http://www.vtk.org/doc/nightly/html/classvtkPolyDataNormals.html.

Hi Amy, thanks for the response.  I did take a look at that class and
but did not understand how I could use it to get the normals at the
vertexes.  Eg, I didn't see any methods like 

  normVec = filter.GetNormal(vertexID)

of

  normalVecs = filter.GetNormals()


So although vtkPolyDataNormals looks like just the right filter, I
don't how to get the data out of it that I need.  The inherited method
GetOutput returns vtkPolyData.  Should I be using this data to access
the normal vectors?

Thanks, 
John Hunter