Blending grass with terrain with no seam

Does anyone have any info on how to perfectly blend grass with terrain with no visual seams? Basically a perfect soft transition between the grass blade meshes and the terrain plane.

Here’s an example someone did in Unity:

Planes:

Here’s what Zack had to say about it on twitter, and I’m curious if anyone tackled this in UE4:

“The planes use the same world coordinate (x and z) derived UVs for grassy diffuse as the ground, and they also set their mesh normal vectors to an interpolation of the nearest terrain vertices so they have the same lighting. That way no blending is needed, it’s all alpha test”

Thank you,
HP