Interactive viewpoint control and three-dimensional operations

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Abstract
Techniques are discussed for creating a rendered view into a 3D scene, interactively based on the locations and orientations of the observer's head and the display surface. Stereoscopic head- mounted displays (HMDs) demonstrate a simplified, special case of these techniques, because the eyes and monitors move in uni- son. A largely overlooked class of interactive displays uses the rel- ative positions between the eyes and monitor as input. These displays can be stereo or monoscopic, fixed or mobile, and the ren- dering process should incorporate the correct perspective distor- tion, which depends on the locations of the viewpoint(s) and the display monitor. Three real-time graphics display systems were prototyped and examined: a high-resolution display which corrects the perspective projection based on the location of the observer's eye; the same display, extended to modify the view as the monitor is tilted and swiveled; and a handheid LCD display which can be freely moved and rotated as it displays a view based on the eye and monitor positions. A simple experiment indicates that tracking the head and pro- viding the appropriate view improves the ability to pick specific 3D locations in space using a 2D display, when compared to a fixed view and a mouse-controlled view.

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