Hi Michael,

i am having some problems applying the scaling rail technique. Sometimes it seems to work and sometimes not. In my example on the left i have a open rail curve and a polyline as scaling rail. On the right the rail is a closed loop and the scaling rail a closed polyline. It takes a lot of time to calculate when i pick the scaling rail, but in the end it doesn't do anything. Is there a techical reason that the scaling rail wouldn't work with closed (primary) rails in general?