If you have an object thats gonna move really quickly from spot A to spotB...this is way of making something that looks like motion blur but without rendering all the inbetween frames.
Hehe, clever system However, in real motion blur, you can't see a perfectly in-focus version of the object at the end of the motion trail. If you move the mouse quickly, you can still see in-focus versions at each tick step.
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Perhaps if you changed the z order for that instance?