[vtkusers] airplane trajectories simplification / aggregation

[sebastien MARAUX]

Hello,

I would like to simplify a set of lines representing airplane 
trajectories, contained in a vtkPolyData.
Ideally, I would obtain some big tubes representing 
"main flights navigation ways".

I tried vtkSurfaceReconstructionFilter, but the update 
method takes a while with around 20000 lines, and I never 
saw the end (I tried to set samplespaacing to 1000, my 
scene being 50000 wide and long)

Maybe CleanPolyData would do it, but it seems to take a while too.

Anybody have an idea of what I could do ?

Thanks 

Seb
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