The valley / WorldMachine / Unreal Engine 4

I created a mountain environment with a valley under WorldMachine, I generated different map for different layer (grass, rocks ...) I exported everything under Unreal Engine 4 or I created layers of folks .. here I did not push to paint different elements but I can easily do it ... I then realized the complete lighting of the scene using the post process volume of the engine ... the complete set is entirely in procedural except 3 trees and a rock added .. by hand :) :) :) ///