It's all in the title, I can't find this function that I used in the past. I selected the "dead" pipe, and the function gave me a pretty good approximation of the neutral fiber. Very useful for quick costing, without having to draw each point of each section, then the neutral fiber in polyline,...
@ludo.mai: this function looks like what I'm looking for, but it doesn't give the neutral fiber, i.e. the curve that passes through the center of each section of the pipe.
@franck.ceroux: Which version of Catia do you use? I can't find this function, nor even the "offset" toolbar.