Kantor said:
Yes, I just realised that the Wii doesn't do the processing, because the Wiimote is the camera. But the Wiimote still needs to process where the sensor bar is, so that takes time. And it still needs to transmit this information wirelessly to the Wii, where the PS Eye has a wired connection. And I'm not sure on the specifics of how WM works, but wouldn't it still need to know the position of the sensor bar in three dimensions?
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Processing where the Wii sensor bar is is done in hardware by the "camera"/infrared sensor in the Wii remote itself, so in practice this doesn't need any processing or increases lag. So the Wii Remote already sends the X/Y coordinate and light intensity of the infrared lights in the sensor bar, and using these values to calculate the X/Y position you're pointing at on the screen extremely simple.
And WiiMotion Plus does not need to know the position of the sensor bar. The problem of the original Wii Remote is that the only motion sensor it has is an acceleration sensor. And the biggest problem of these acceleration sensors is that they cannot detect rotation about the "vertical" axis at all (well, I mean the axis called "Z" in the following image)
This was a huge problem especially for the accuracy of games like table tennis. WiiMotion Plus solved this problem, as it adds a gyroscope which is capable of detecting such motions as well. There is no need for WiiMotion Plus to know where the sensor bar is, as the sensor bar is only used for pointing on screen anyway.
So with the WiiMotion Plus addon, the Wii is now capable of detecting relative rotation around the axis called "Z" in the above image. But unlike the Move controller, what it still cannot detect is absolute rotation around the "Z" axis. So for example, it doesn't really know if the front of your Wii Remote is pointing exactly towards the screen, in a right angle from the screen or exactly in the opposite direction of the screen. The Move controller knows this because it furthermore has an additional magnetic field sensor (which works like a compass), and that makes games like for example table tennis more realistic and accurate. And its the main reason why waggling still works in Wii Sports Resort table tennis.
So even without the additional camera/glowing sphere combination that slightly increases the lag the Move controller is way more accurate than a Wii Remote with a WiiMotion Plus addon. Don't use the camera and the glowing sphere in a PS move game, and the lag will be exactly as low (or even lower) than that of the Wii Remote, there will be no processing overhead and the Move controller would still be more powerful and accurate as a Wii Remote/WiiMotion plus combination.