3D grass shader to mimic large grass field

[JvdBosch]

What happens if you use my code on your grass node, without superimposing this other texture?
Another option is a blend-shader which blends according to the distance to the viewpoint, to keep close sharpness.

[Zhi]

Seems not help with your code (see attached screen shot). I assumed the "node" in your code is the "ground" in my code.