Ghosting/ Output Velocities

So I know with “output velocities due to vertex deformation” and Velocity Pass selected to “write during base pass” reduces ghosting on moving objects. Now I’m not even sure what these do, I just know what it does, but I’m now faced with another option in Preview that is “Write after base pass” … Can anyone explain to me maybe a little bit of whats going on, and perhaps lead me in the right direction as to either “write during” or “after” cause I really don’t know… Thanks

Probably not even in the right section, sorry

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