hi michael,

understood. here are some pics using the sweep. the back edge that has a ton of curvature appears smooth until you start zooming in and then it becomes piecewise linear. i have tried various mesh angles but this doesn't have an affect on it. the only way i can get rid of it is to go through a bunch of steps to generate curves that i can then use the network command on. it is much easier to use the sweep obviously. i tried rebuild on all the curves and rails prior to the sweep and that helped a lot. i previously hadn't thought to do rebuild on the rails. but i am still left with this piecewise linear problem. it seems like there is some sort of internal setting that the user can't access that is controlling this phenomenon. not sure though. in any event, i can see this working out ok. i just have to pound on it some more.