Key points are not available for this paper at this time.
Mobile interfaces are evolving towards touch-based approaches. This allows users to interact with their thumb directly on the screen. Such kind of direct approaches may be fussy for 3D interaction tasks, in particular because of thumb occlusions. In this paper, we introduce a new 3D user interface for the control of a planned trackball, where the users sketch horizontal or vertical movements to observe an object. A user study revealed no significant difference for error rate between this new approach and a standard trackball control. Despite a better completion time with the direct control, the study showed that the subjects preferred using the planned version of the trackball because it limits disorientation.
Dècle et al. (Tue,) studied this question.