Motion Control – The Art of Motion Control: Beyond the Hype

The Art of Motion Control: Beyond the Hype

By Hubert Nguyen, Posted on Jun 4, 09 12:22 AM PDT

The Art of Motion Control: Beyond the Hype

[E3 2009] I don’t think that anyone had envisioned a post-E3 motion controller war, but that’s what’s happening in the forums and elsewhere right now. After the cool on-stage demos from Microsoft and Sony, gamers are split on what’s “better”, Sony’s Motion Controller magic wand or Microsoft’s full body project Natal. Our first take was that Project Natal was “better, but let’s try to go beyond the hype to review how each technology works, how it could be used and which might ultimately win.

The Nintendo Approach

Let’s establish some facts with the precursor: the Wiimote. Wiimote is a two sensor system made of one 3-axis rotation sensor and one optical (IR) sensor located in the pointer lens that tracks where on the screen the Wiimote is pointing at, relative to the sensor bar that comes with the console. An additional Nunchuck that also contains a motion sensor can be connected by a cable to the Wiimote. The recently introduced Wii Motion Plus is an add-on to the Wiimote that contains an angular rate sensor that can help differentiate between “twisting” and linear (movement) motion, thus making the overall motion sensing and interpretation more accurate.

Note that all these sensors only know what’s happening (rotation, acceleration) relative to their own position. They are the center of their small universe. Because of that, every Wii game is using some sort of context to “guess” how to interpret the data. They often need a “start position” that will tell them what the point of origin is (archery or golf are good examples) or games like Tennis sense simple swings and mostly adapt themselves, depending on the player’s position on screen. It’s robust because there are no external factor that can interfere and it’s arguably an efficient way to tackle the problem.

The Sony Approach

The Sony Motion Controller also use a motion sensor but it is augmented with visual information fed by a camera that can see a tracker (the glowy end of the remote). The presence of the motion sensor in Sony’s product is significant because that’s what propelled the visual motion tracking from “relatively bad” to “really cool”. Why? Because optical (color) tracking alone was simply not good enough. But when combined with a motion sensor, it actually surpasses the Wii Motion Plus.

Thanks to the internal sensor, the Sony Motion Controller knows exactly what orientation/acceleration it currently has but it also knows exactly where it is in space and what kind of motion the controller is really doing in the real world. Unlike the Nintendo solution, Sony has much less “guess work” to do because it can “see” what’s going on, although we think that games will still have to make some assumption about the current activity.

Optical tracking is not without challenge. Some external factors such as strong lights or sensor occluders might be problematic, but overall, Sony has done a good job of demonstrating the capability of their concept. We will know for sure when this will be an actual product but Sony’s motion sensing solution is theoretically superior to Nintendo’s. The controller itself will have buttons, so it is something that players should be accustomed to.

The Microsoft Approach

In short, Microsoft senses more: color, depth and voice. From a high-level, takes a visual approach to the problem, but the additional depth perception helps Microsoft overcome the barrier onto which Sony’s EyeToy color-based approach crashed. That makes it less prone to color interference, except for occluders (too much junk in your place) and even then, a simple subtract operation can probably wipe out the static object (including you, if you’re a couch potato). Anyhow, by using a virtual skeleton of the player (created once, then stored), Natal is capable of figuring out the body’s motion, including its position in space. Microsoft’s Natal greatest strength is that it can scan full body motions, something that neither Sony or Nintendo are capable of doing with their motion sensing solutions. Natal should, in theory, be much better for a boxing/fighting game or for the next Dance Dance Revolution type of products. It could also teach you to swing perfectly by comparing your skeletal motion with Tiger Wood’s…

It is however far from being a product and while we think that it mostly works, we wonder how much setup is involved. The video footage that shows how Natal works in the living room

is a concept, Microsoft warns, and while we hope that it will be as good in reality, we are cautiously optimistic.

Theoretically, with Natal you could also hold a rolled-up magazine and use it as a “sword” – no accessory needed. In its promotional video, Microsoft hinted that you could use any objects with Natal and it depends entirely on the application. We have heard that Microsoft has already approached game developers, and that so far, it is “very usable”.

Conclusion

We thought that Sony and Microsoft would have come up with something to counter the Wiimote years ago, but “late” is be better than “never”. Both companies have realized that non-hardcore gamers represent their future growth – that’s what Nintendo itself said too- and if they want to cash on this new manna, they have to have motion-based games that seem so popular.

On the paper, Microsoft’s solution looks to be the most flexible one, but as always the content (and pricing) will dictate its success. In our view, the lack of button is a problem (do you believe in gestures for everything?) that is easy to solve with a cheap, small, wireless controller. But, because it is so different (superior?), developers might take a wait-and-see approach before creating games that cannot be ported to PS3 and Wii even if we expect an initial rush to be bundled with the hardware when it launches.

Sony’s solution is factually better than Nintendo’s and uses relatively known and proven concepts. It looks close enough to be a product, so we don’t expect bad surprises at this point. Sony’s Motion Controller might not be as “cool” as Microsoft’s Natal, but it might be enough to get new gamers on-board, and that’s what counts in the end. We think that because it is closer to Nintendo’s solution, game developer might port their Nintendo titles to the PS3 easily.

Nintendo seems to be the “loser” of this story, but the low price of the Wii will protect them in the short term, and they have another year before competitors have real products. Conceptually, they too could come up with a vision-based solution, although the weakness in processing power would probably come back to bite them in the butt. Another non-negligible fact is the incredible branding credit that Nintendo has acquired in non-gaming (aka new customers) circles. Finally, the Wii might be just “good enough” for these games – at least for this round of consoles. For sure, Nintendo will have to find another trick for its next-generation console.

The gaming world just entered into a new motion sensing arms race. Prepare for sweating!

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8 Comments  

  • dqbeast 1 month ago

    First I would like to state that I own a ps3 and that I think its a pretty good console with great games. I believe xbox’s natal will be fun. It will be a good add on to the 360 to play fighting and some sports games. But in the end I believe that the ps3 motion sensing controllers have more potential due to having a controller and buttons. This will make it easier for game companies to make more in depth like the wii has. Natal on the other hand will have fun mini game style games that will be cool to pick up and play. In the end though, hard core gamers like myself wont really care about the motion sensing and would like to play re5 or lp with their normal controllers.

  • john prince 1 month ago

    ps3 has most potancal

    natal sucks i tryed it

    wii will lose this war in the end

  • It would be interesting to compare how much profit each company has generated from their respective consoles.

  • Jerome 2 months ago

    Not a bad article, but you messed up on a big point.

    The Wii’s control system does allow for absolute positional tracking. The PS3’s scheme achieves this with a fixed-position camera tracking mobile round shapes of a particular color, while the Wii uses a mobile infrared camera to track two fixed points of infrared light. The Wii’s method will entail the reference points not being visible to the camera at times, but this will also happen, though less frequently, with the PS3’s. With either system, internal sensors alone will be relied on for measuring position and orientation until the reference point(s) is/are visible again. In fact, the Playstation Eye camera only has a resolution of 640×480, nowhere near enough, by itself, for the “sub-millimeter accuracy” claimed in the demo. This shows that the internal sensors can track motion and orientation with a higher degree of accuracy than the camera, and mainly rely on it to prevent drift, or accumulated error. This would also hold true with a Motion Plus-equipped Wiimote. The only thing standing in the way of a Motion Plus game tracking absolute position would be the lack of proper calibration options in software.

  • Thanks for the comment. I believe that the Wii’s infrared system can be used only as a pointer (mouse, lightgun), not to track the absolute position of the controller in space. I’m not sure how much credit I would give to the sub-millimeter accuracy claim, if any, although do we need sub-millimeter accuracy for gaming?

  • Facebook User 2 months ago

    Porting Wii titles to PS3 ? You gotta be kidding. Audiences, prices, hardware, differ so wildly that ports between those two are more than unlikely.
    No buttons to Nadal a problem ..? What about those on the 360 controller !? Games will most likely let you use both. I see much more potential in {controller+body motion} control schemes than the latter alone.

    I agree with the bulk of you analysis though.

  • Smartq7.com 2 months ago

    I like it. All games company are innovating. I think that is a good thing!

    ———————
    get Smartq7 at “www.smartq7.com”

  • strider_mt2k 2 months ago

    Good stuff!
    I was wondering about that stuff!

    I just gave my wife a Wii for her birthday, so motion sensing been a topic of discussion.

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    About rayrr

    10 years as a NetWork Administrator in the Virginia Beach, Virginia Area. 11 years in the San Diego, California area. Went back to Manila Philippines to relax and rest away from the rat race. View all posts by rayrr

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