Abstract: How to achieve 360-degree observation through the redirection method, and at the same time ensure the user’s higher comfort level and lower sense of vertigo, is an important topic in VR research. In this paper, the interaction efficiency and vertigo perception of the amplifying and guiding head rotation algorithm are studied quantitatively: the users sitting in a couch without movement and rotating to a comfortable angle when wearing a head-mounted display (Pico neo Basic Edition) to view a 360-degree virtual range. Two amplified head rotation algorithms are designed and compared with two existing methods. At the same time, an automatic detection algorithm for guiding the area of interest in head rotation is designed, and the algorithm can dynamically calculate the angle threshold  of the virtual object and select the area of interest in real-time. Based on this, a sine-based guided rotation algorithm is designed.  Through a great deal of experiments, much important information about the experimental comparison results of each algorithm is obtained. Finally, the problem of how to redirect the head rotation in a relatively complicated virtual environment is solved.

Key words: amplified head rotation, guided head rotation, threshold of angle, area of interest