Hi Pilou and Jean. Thank you for taking time to respond. I used the Shapebender Tool but it does not fulfill both criteria required. It must maintain 1:200 gradient It must remain 25m below terrain In a road example, the road would have a gradient and remain on the mountain surface crossing contours. If I could accomplish the mountain road I could transfer the centre line down to the required depth. The only guidance the road would have is the given contour set and terrain. Thanks Garry [image: Bwsd_Alpineroad2.jpg]

I had confirmation by Fletch himself the author of the animation above With Mover or Proper animation @unknownuser said: So the columns are just moving from below ground to above ground. @unknownuser said: In Twilight v.2.0 rendering of animation of section planes will be a nice new feature. You will even be able to render an animation of an object moving while the animated section cut is moving. So the V2 will be very very cool!