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Check out this gif of the BB-8 robot rolling through desert:

See how its head is wobbling a lot? Now see this footage of BB-8 on stage of The Force Awakens celebration panel in Anaheim (seen from 0:30):

Is this the same exact robot that was used in the movie? I'm asking because I'm interested in the technology and how the robot is holding its head on the spherical body differently in the gif and the video. Perhaps they're different models, but maybe they're not, since the one on stage doesn't move as fast as the one in gif.

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    I don't think we're likely to find out whether it's the exact same robot or just the same model, but I think it's limited speed on-stage is just due to the limited room; in the trailer, it's bookin' it in a straight line over a long area. The person controlling it during the live performance was probably trying to avoid sending it flying off the stage in front of an audience. – Liesmith Apr 17 '15 at 16:38
  • I've thought about it and came to the same conclusion. But maybe somebody actually knows. – user1306322 Apr 17 '15 at 16:39
  • Well then take an upvote, because I'm curious too. – Liesmith Apr 17 '15 at 16:43
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    Technologically relevant xkcd imagery. – user1306322 Apr 17 '15 at 18:09
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    YUP: bearings and magnets? how do they work? – Yorik Apr 17 '15 at 21:15
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The robot in this particular trailer is likely a CGI model. Here is some speculation, and of all versions, the one with mostly empty head magneted to a rod inside the ball seems more or less plausible. But as you can see, the head jumps around a lot. Magnetic force weakens quickly with increasing distance between magneted surfaces, so when the head jumps around, it would likely lose almost all of the attraction and fall off. To keep it upright, we need more powerful magnets, but they'd likely just stick the head to a single point on the ball, moving together with it, and it would lose the ability to ride always-on-top.

As for the version with a robotic head, balancing a kinematically unstable platform is a common problem in robotics. Is can be solved with dynamic stabilization algorithms - that is what allows ATLAS, Rezero, Double and numerous other robotic platforms to keep it upright, together with arrays of sensors (gyroscopes+accelerometers) and actuators that are quick enough to respond to sudden disturbances of equilibrium. But still, a fast and bumpy ride like this is a tough challenge, so I highly doubt that it could be a physical robot. Also, does the FX team really need to invent such a highly advanced robot for only a few scenes (those fast-and-bumpy), especially considering the Lucasfilm' love for CGI in the recent SW movies? I doubt so.

As for the robot in the celebration panel, as well as the prop used in less dynamic scenes, it could easily be one of the technologies mentioned above (again, most likely magnets, not a balancing platform).

Possible BB-8 mechanism taken from above link:

Possible BB-8 mechanism

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There has been a lot of discussion about this. The cast and crew of the movie have all been discussing the importance of using physical effects in the movie. You can hear a lot about it in their panel from San Diego Comic Con. As for is that actually the same one. They may have made multiple droids but they definitely referenced that that one was used in filming scenes in the movie during the Star Wars Celebration.

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    Welcome to Stack Movies , it will be better if you provide some reference material to back up your answer. – Panther Jul 19 '15 at 18:00
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    Answer without reference may lead to downvotings – Panther Jul 19 '15 at 18:01

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