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New submitter anguyen8 (3736553) writes with news of an interesting experimental spatial input device. From the article: "The mouse is a hugely useful device but it is also a two-dimensional one. But what of the three-dimensional world and the long-standing, but growing, promise of virtual reality. What kind of device will take the place of the mouse when we begin to interact in three-dimensions? Anh Nguyen and Amy Banic ... have created an intelligent thimble that can sense its position accurately in three-dimensions and respond to a set of pre-programmed gestures that allow the user to interact with objects in a virtual three-dimensional world. ... The result is the 3DTouch, a thimble-like device that sits on the end of a finger, equipped with a 3D accelerometer, a 3D magnetometer, and 3D gyroscope. That allows the data from each sensor to be compared and combined to produce a far more precise estimate of orientation than a single measurement alone. In addition, the 3DTouch has an optical flow sensor that measures the movement of the device against a two-dimensional surface, exactly like that inside an ordinary mouse." The prototype is wired up to an Arduino Uno, with a program on the host machine polling the device and converting the data into input events. A video of it in action is below the fold, a pre-print of the research paper is on arxiv, and a series of weblog entries explain some of the development.