In a slightly creepy but undoubtedly impressive feat of DIY electronics, an evidently lonely Japanese hacker has put together a virtual girlfriend through a combination of motion-tracking hardware, video goggles, and some scavenged 3-D game assets.
A video on YouTube, originally posted at Hack a Day, shows the view through a pair of video goggles that have been augmented with an Asus Xtion motion-tracking tool, essentially an off-brand Microsoft Kinect. This helps track his motion and the environment, and is assisted by some augmented-reality software that places virtual items on the image.
The last ingredient is, of course, a popular Japanese virtual pop idol. Hatsune Miku has starred in many games and concerts, and clearly the builder, known at the moment only by his online handle "Alsionesvx," is a fan. He collected some 3-D models and animations from a portable game that has some augmented reality functions and merged them with his hacked-together environment.