$16 for a *very* non-performant material? If this was intended for use in high-detail scenes, not meant for gameplay, one would generally just use a flipbook animation, or looping HD video texture (both of which are higher quality and available for free all over). I love options, but c'mon, that's pretty steep. $5, maybe. And you can loop in materials, using custom HLSL nodes. Also, there are better ways of doing this, all around. Somewhere on the forums, Ryan Brucks (of Epic fame) himself touched on this. I've personally been working on a cool water material (not "material blueprint", thankyouverymuch) and utility functions, and am close to the quality achieved here, sitting at ~180 instructions with everything "turned on". The kicker? It's pure procedural. No textures are needed. So this is cool, no doubt about that. In my humble opinion though, it's not "good". It doesn't run fast, and it's more complicated than it needs to be.
Lee is right - you can use a gradient effect when you vertex paint in your chosen 3d modelling platform (I've done it in max), meaning the wind effect shifts from nothing to maximum along the length of the leaf/branch/whatever.
I'm fairly certain you can vertex paint the bottoms of the foliage and control the movement using vertex colors along with the wind node. I did this in an earlier project and was able to create a scene with grass that moved less and less as it went down until stationary. I created the grass and painted the vertexes black to red (bottom to top) in Maya.
Check out a Unity pack that includes 160 procedural materials. Some of them come with customizable parameters, while others present a “Random Seed” property for you to get a different look.
The materials come in low resolution, put in high resolution following the steps described in the text document “READ ME FIRST”. Please look at the preview of the package before making the purchase, you will be able to see all the materials in this way.
This package will receive updates with new materials every month! Extremely lightweight: weighing only a few kb (with no quality loss). The materials are in Substance format (compatible with all Unity versions). You can set the resolution of your choice! Comes with special materials with customizable parameters.
You can find more details on the pack here.