Augmented Reality Fitts' Law Input Comparison Between Touchpad, Pointing Gesture, and Raycast

With the goal of exploring the impact of transparency on selection in augmented reality (AR), we present a Fitts' law experiment with 18 participants, comparing three different input methods (finger based Pointing Gesture, controller using the Touchpad, and controller using Raycast), across 4 different target transparency levels (0%, 30%, 60%, and 90%) in an optical see-through AR head-mounted display. The results indicate that transparency has little effect on selection throughput and error rates. Overall, the Raycast input method performed significantly better than the pointing gesture and Touchpad inputs in terms of error rate and throughput in all opacity conditions.