Purchase it here! https://www.unrealengine.com/marketplace/procedural-nature-pack-vol A procedurally generated nature environment in the Unreal 4 Editor
Tree's, rivers, moss placement, branches, vines, grass placement, almost the whole enviornment is created procedurally in the engine using splines, vertex painting, and random world position values!
Procedural River (Nature Scene WIP)
(Coming Soon) - Procedural Nature Pack - Preview