[vtkusers] all my streamlines are in white :(

[Yifei Li]

Hi all,

I want streamlines to be colored according to scalar values, but they are
all white. Can someone help me figure out what's wrong with my code? Thanks
 -Yifei

# vector field data
grid = vtkStructuredGrid()
grid.SetPoints(points)
grid.GetPointData().SetVectors(vectors)

....
streamer = vtkStreamTracer()
...
# show streamlines using ribbon
rf = vtkRibbonFilter()
rf.SetInputConnection(streamer.GetOutputPort())

streamMapper = vtkPolyDataMapper()
streamMapper.SetInputConnection(rf.GetOutputPort())

# I thought the following lines should make it
streamMapper.ScalarVisibilityOn()
streamMapper.SetScalarRange(0.0,
grid.GetPointData().GetVectors().GetMaxNorm())
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