Bi-3D: Bi-Manual Pen-and-Touch Interaction for 3D Manipulation on Tablets
summary
A tablet prototype implements Bi-3D, a 3DOF bi-manual pen+touch technique where the pen drags in-screen and a pinch gesture moves the object in depth; sketching, extrusion and drag‑and‑drop tools demonstrate fluid alternating and parallel use. A lab study compares Bi-3D to a separable widget and a mid‑air tracked stylus: Bi-3D is faster than the widget and shows no difference to mid‑air while participants report the widget as complicated. Limitations include two‑hand coordination needs and less perceptible Z precision from pinch gestures.
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