You mean how the blurred rotation was made? It's just a motion blur (Lux supports it, did you know? :)), nothing fancy. Set frame 1, set the key position for your objects with the "I" key, go to frame 2, move/rotate your objects and set them a new key position. Then return back to frame 1, activate Motion Blur in LuxBlend (Cam/Env tab) and render.
Btw, does anybody know gaussian sampling works or what? I'm able to get a MB effect with uniform sampling only.
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