First of all i am not the creator of this method I just found this tutorial (PDF) on the web and found it very useful so i decided to make a video version of it with another example hope you find it useful too. (The original creator of this method is Nick Guth nickguth.com)
The equation used for the Motion Vector pass for the u and v channel is -1*(((1024 - 1) * .5) / (1024))
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