I want to make wind animation for vegetation using Vertex Colours for game engines. I've seen some great documentation on how to do it in UE4 with Max (pivot painter).But I want to do this with Blender, and also export to Unity. For Unity there's an asset called "Pivot Brush" with which you can vertex paint on meshes…
You have a vertex paint mode in blender And no: baking them to texture would defeat the purpose of vertex colors. They are stored as part of the mesh data and e.g. the fbx file format does help to transport them to your engine of choice