[vtkusers] StreamTracer input Attribute

[Kevin H. Hobbs]

I've been having difficulty producing streamlines. So far my pipeline
looks like this:
ImageData to ImageGradient to StreamTracer to XMLPolyDataWriter. The
polydata this produces is empty. 

Do I need to use AssignAttribute between ImageGradient and StreamTracer?
How should I set the attributes?
Am I missing something else?
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