| Summary: | 碩士 === 國立臺灣科技大學 === 工業管理系 === 97 === This study investigated the performance of remote target acquisition using free hand movement as an input device in a 3D Environment. An experiment was conducted in which 10 right-handed participants were required to move a cursor into a target sphere as quickly as possible. There were 3 target sizes, in 3 distances, and 17positions. Performance was measured by a record of reach time, adjust time, total time, and moving trajectories.
The result showed that target sizes, target distances, and target positions significantly affected performance. Mean total time in Z axis (4.93 s) was longer than that of X, Y, and XY axes (ranged from 3.53 - 4.31s). Total time of the upper directions without depth (4.69 s for upper left; 4.97 for upper, and 4.58 s for upper right) tended to be longer than with. Participants adopted a directly moving strategy to targets in these positions and result in time saving. Whereas, they moved in XY plan and then reach for Z axis thus while acquiring targets in the X and Y plans thus result in a longer moving time. The goodness of fit of the data to Fitt’s function is better for targets without depth (R2=0.94) than those with (R2=0.84).
This study indicated that the drift of Z direction, target position, and the presentation of depth cue should be took into consideration for their potential contribution in target acquisition with free hand in a 3D environment.
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