[vtkusers] Visualizing normal vectors

[Andaharoo]

I'd recommend using vtkOpenGLGlyph3DMapper instead. Much faster, assuming you
have some gpu. Just make sure the normal array/orientation array is in the
input polyData's point data.

IE:
polyData->GetPointData()->AddArray(your normal array)

Then just specify the array the mapper should use with
SetOrientationArray(your arrays name here). It will then search for the
array in the input polydata. I frequently use this to draw thousands of
oriented arrows with VTK.



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