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Erschienen in:
1996 | OriginalPaper | Buchkapitel
Screwball: A User Interface for Specifying Screws
verfasst von : I. A. Parkin
Erschienen in: Recent Advances in Robot Kinematics
Verlag: Springer Netherlands
Enthalten in: Professional Book Archive
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ScrewBall is an extension of the ArcBall implementation of a notional thumb-ball, visible on the screen and activated by desk-top mouse movements, which provides an acceptable user interface for specifying rotational displacements of computer-graphical objects. The ScrewBall extension permits specification of general displacements — i.e. of mixed translations and rotations — by allowing the user to specify a finite displacement screw or, equivalently, the vector part of a unit biquaternion. The paper describes the mathematical basis of ScrewBall, its relationship with ArcBall, and the computer-graphical context in which it would be applied.