[vtkusers] How to generate smooth line

[YaoHaofeng]

I have a set of lines in vtkAppendPolydata filter to form some brain tracts, which then fed into the polydataMapper, but they are white and look very bad, there are some programs that generate smooth lines as:
http://people.csail.mit.edu/lauren/dti_pic5_large.png

can anybody tell me how to generate the same effect for the lines? I tried to feed the vtkAppendPolydata filter into the tubeFilter but it says the problem is too big to fit into the memory.

thanks

hank 
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