| 摘要 |
An apparatus, method and algorithm for the economical, intuitive rotational control of a three dimensional object displayed on a computer monitor. The computer input device consists of a tracked ball, with a directed source emanating from it, that is housed in an enclosure which allows for the free rotation of the ball. The ball sits on a bearing within a base equipped with an array of sensors. Activated sensors are grouped in such a way that the positions of the detected sources can be determined. A 3x3 orientation matrix is then computed to allow applications programs to present a graphical object in the same orientation as the orientation that the user has given to the ball in the input device.
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