Interacting with digital contents in 3D is an\nessential task in various applications such as modeling\npackages, gaming, virtual reality, etc. Traditional\ninterfaces using keyboard and mouse or trackball\nusually require a non-trivial amount of working space\nas well as a learning process. We present the design\nof EZ-Manipulator, a new 3D manipulation interface\nusing smartphones that supports mobile, fast, and\nambiguity-free interaction with 3D objects. Our system\nleverages the built-in multi-touch input and gyroscope\nsensor of smartphones to achieve 9 degrees-of-freedom\naxis-constrained manipulation and free-form rotation.\nUsing EZ-Manipulator to manipulate objects in 3D is\neasy. The user merely has to perform intuitive singleor\ntwo-finger gestures and rotate the hand-held device\nto perform manipulations at fine-grained and coarse\nlevels respectively.We further investigate the ambiguity\nin manipulation introduced by indirect manipulations\nusing a multi-touch interface, and propose a dynamic\nvirtual camera adjustment to effectively resolve the\nambiguity. A preliminary study shows that our system\nhas significant lower task completion time compared to\nconventional use of a keyboardââ?¬â??mouse interface, and\nprovides a positive user experience to both novices and\nexperts.
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