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

I just saw a forum post that mentioned that detail meshes should have the vertex color alpha painted to determine how much wind affects them.

So the official solution is to paint your vertex color alpha black at the bottom, and then some value at the top depending on much wind should affect it.

This seems to be a documentation bug in the Detail Mesh reference page.

For anybody trying to solve this probelm... here is a youtube video showing a fix, step by step...

https://www.youtube.com/watch?v=1QbpCZuGe7M

I have this problem too. As Steven 1 points out, is there a way to make the plants sway instead of moving?

I sort of solved this. What I did is use the tree panel and added the bushes and ferns as trees. This caused an info message in the console that said my billboards would not work if I didn't change the shader to Nature Soft Occlusion. I went to each Bush/Fern model in the project panel and changed the shader to Nature/Tree Soft Occlusion Leaves. That gave me an acceptable result - a mesh with proper transparency and proper swaying behavior (doesn't float across the ground). The warning message disappeared and billboards are working fine.