fence mesh duplicates along mountain plane I want to have a &quot;picket fence&quot; go along a slope, like this picture kind of: 
I have a pre-made mesh for the ground (a.k.a., I don't want to remake it / automatically make the fence follow some kind of path, my actual mesh is an ANT terrain).
I can easily make the fence mesh from any number of tutorials (and duplicate it using the array modifier), but I'm not sure how to make it go around a mountain mesh / keep the same height etc. My mesh looks a like this: 
I want the fence to run in a complete circle all the way around the mountain on it's slope.
Any ideas?
You can use Animation Node to create a spline that follow the surface of the terrain and then deform the mesh on it just as you described.

First, create a curve that define the path of the wall, sample some points on it, ray cast them on the terrain, create a new spline from those projected points:



The same applies for the any spline, a circle for instance: