proper animation does just that, although the movement between scenes is linear and can not use a defined path. It's still a fantastic extension.

http://morisdov.googlepages.com/

stefan- your problem is a perfect example of when the inferencing thinks it is smarter than you but gets very annoying! One solution to your problem is to draw a transparent plane well above your terrain. Draw your freehand lines as well as you can on the plane above, then you can drop the outline onto your terrain