Wind: Detail meshes are moved by wind back and forth, rather than swaying: how do I make them sway?

Anyone could confirm/deny this?!

God at play is perfectly right, change the alpha on the vertex colors on your mesh, 0% no movement us at base and ramp up to about 60-75% for the top vertex's which are effected by the wind,, then re-import, remember to refresh your model import and re-assign the prefab to the detail mesh under grass.

Yep, this video explained exactly what I had to do. THANK YOU!

I used Maya 2017 instead of 3DSMax, but the same principles apply.

I modelled some quads, and set them up as a cross, or a tri-plane (whatever suits you).

Then I used the "Split Selected Edge Ring" tool to add another ring of edges around the middle.

I then selected all the bottom verts, and went to Mesh Display > Apply Color (and selected the Options for that entry in the menu -> click on the "box" icon on the right of the menu item itself).
[TIP: You can add it to the tools Shelf by Shift + Ctrl + Right Clicking the menu item, or even on the Options icon... making it easier to get to quickly.]

I then set the Color to white (or grey - you may need to fiddle around to see how it all lights once it's in your scene - I haven't figured out the right brightness yet), and most importantly, set the Alpha to 0.0 (so the bottom of the mesh isn't affected by the Unity Wind at all.

I then selected the middle row of verts, and painted them at Alpha 0.35 or so. (Click "Apply Color" button while you have the relevant verts selected - you'll see the viewport update to reflect your values).

I then selected the top row of verts (at the top of the grass model), and painted them with weight 1.0 (or use 0.8, or whatever you think looks best with your experimentation). Apply Color.

You can add more or less detail into your mesh, to control the different weightings and how your model will be affected by wind in Unity.

You can also do more diverse things (as mentioned in the video) like:
Model a vine stalk (with Alpha = 0, so it doesn't move at all), and add leaf models to it with a weighting that moves towards 1.0 at the tips of the leaves, and the leaves will move in the wind while the stalk remains stationary. :)

Are you following http://unity3d.com/support/documentation/Components/terrain-Grass.html ?

Is there a solution to this - I love the look of the Terrain Detail grass renderer but the sway is uncontrollable. is there a way to control this by code? It rocks back and forth (root to leaf) even if you dont have wind setup in the scene. Or is there a way to get a similarly selectable dual colored render for terrain grass by some other means?