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Motion blur (post processing)

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I've implemented the 2.5D motion blur technique before, where you use the Depth-Buffer and the current/prev camera matrices to get approximate motion vectors -- the only problem is that this only generates blur based on the camera's movement, not object movement. I'm experimenting at the moment with using current/previous depth-buffers as well, so I can get each pixels world-space position for the current & previous frames. I then get the difference and rotate it into view space to use as a motion vector, which seems to work somewhat for object-motion-blur as well as camera-motion-blur. I'm wondering if anyone's heard of this technique before and/or if they know of any literature on it that might help me finish my implementation?

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