[vtkusers] problem for using vtkTubeFilter

[Luyece Power]

Please help me!
When I used vtkTubeFilter to increase the thickness of curves, I got following error message. 

ERROR: In .\vtkPolyLine.cxx, line 102
vtkPolyLine (01D0C4C0): Coincident points in polyline...can't compute normals
Warning: In .\vtkTubeFilter.cxx, line 225
vtkTubeFilter (01C80CA0): Could not generate normals for line. Skipping to next.

Anyone know how to solve this problem?

Thank you.
Lu


      
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