Between Johann Sebastian Joust and Neil Stephenson's Clang, there's been a fair bit of interest in motion-controlled swordfighting games of late. Microsoft Research is getting in on the action, too, but its SwordFight project takes a slightly different approach by working on nothing more than your mobile phone. While there have been similar apps before such as Star Wars: Lightsaber Duel, SwordFight uses a technology called FAR that allows the phones to locate each other using sound. It's pretty simple on the surface — one phone makes a sound, and the other works out distance based on the time it takes for the sound to travel to the microphone.
Microsoft researcher David Chu told Wired that this can be determined down to 2-centimeter...
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