Thanks for the reply,
really appreciate all the answers and effort you (and the previous responder) put in to solve VTK questions.
In the meantime, I did get to the same point by trial and error myself ;0). Although “tube_filter.SetInputData(tube_poly_data)” needs still to be called, since tube_poly_data has changed as well.
Slowly but surely I’m getting the hang of this pipeline thing in VTK.
Will definitely ask questions sooner next time. Took me a while to sign up here in this forum.
Again thanks a lot
Thomas