Custom Wind Function + Example Project
https://gum.co/eKMPd
I took my material from my later project and tweaked it enough to be able to use on any kind of grass, so long as its UVs are within the 0-1 range. There is no textures involved here and the grass I made is a simple subdivided strip that I built a "clump" out of. I'm using time and world position to generate randomness as well as a global soft wave that can be controlled, including the direction.
Tweak the values to get a good look! I will be updating it soon so that the wind can be vert blended.
In this example, UE4s simple grass wind is not being used, but there is an option for including it to help break it up further.
I'll be putting the project up on gumroad for download. If you download it and you find it useful, please consider giving credit or maybe pitching a couple dollars towards my paypal or my gumroad. Cheers!