Terrain detail mesh interaction with wind

So apparently it’s possible to assign which parts of your mesh should interact with wind when drawing on terrain.

There is absolutely no documentation about this anywhere, but you can vertex paint the alpha values of your mesh so that black means no movement and white means all movement.

The only problem is this can’t be done in blender apparently cause blender only exports RGB values instead of RGBA.

So does anyone know of another way to assign this without downloading maya or 3ds max?

I remembered there was some kind of tool / workaround for this issue, found this thread where people are using custom export scripts for blender to export RGBA vertex data. Note that there were multiple updates posted for newer blender versions as well.

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Ye kinda wanted to avoid overwriting blender scripts.
I also checked the newer version but that didn’t seem to work either.

The weird thing is you can actually paint rgba in blender, but it just doesn’t export the alpha value, which is just silly.