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Any idea on how I can make particles be driven by wind in unity?...so that I can create a toon sky trail effect?
You can add noise to them in the particle system component which makes them move randomly, you can set how much they move randomly, if you do it right you can make it look like it's being blown by wind. Then you can use the velocity setting to make it go in a certain direction that you can change through script if you need.
You can also apply external forces to the particles, to make then change direction in a specific area.