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Walking with Pens

Believable 3D animation of walking or running characters still requires complex motion capture technology or extensive skills in manual keyframing. We present an inexpensive, yet natural input method: The user “walks” on a digital graphics tablet, striding over the surface with two pens in his or her hands, where each pen represents one leg. This technique leverages the popular graphics tablets that can track two drawing tools at the same time. We implemented recording software and a plug-in to use the data in off-the-shelf 3D animation software.