hi brian,

yes if they are off some it is probably round off error. i added them to try and help you. but if you can do it another way that is better. i previously tried adding them about a year ago and found it was problematic due to round-off error. so feel free to take them out if you don't need them. you are right that they perform double duty and are intended to be the start and end of the spline. i didn't realize you needed them in a certain order. so if you do keep them and need to move them that is fine.

should i try out the script you just posted or do you want me to wait until you settle on a method. i'm fine with whatever works for you.

thanks again for your hard work.

anthony