Quixel's Jonathan Holmes teamed with Jack McKelvie and Joseph Downer to discuss multiple workflows that can be used in UE4 to blend assets in a terrain.
The guide focuses on making a field that has been battered by artillery fire. The team used the ‘Damp Soil‘, ‘Cut Grass 2×2 M‘, and ‘Grass Clumps‘ from the Megascans library.
One of the discussed methods is world aligned texturing, a form of triplanar mapping. Basically, you project a texture from the front, sides and top/bottom of your object to set up seamless transition.