Sun Menu: An Outward Ray-Based Radial Menu for Accurate VR Selection

Abstract

In dense VR radial menus such as Pie Menus, each item's angular width shrinks as item count grows, making selection errors likely during rapid ray-based selection. We propose Sun Menu, which arranges 24 items into eight coarse regions, each connected to three terminal options on the outer edge. Sun Menu accepts the initial ray direction as a coarse directional selection and defers fine-grained candidate selection to the outer terminals, so that users need not aim directly at narrow angular sectors while selection remains a single outward ray movement. In a user study with a 24-item Pie Menu as a baseline, Sun Menu showed significantly lower error rates under all of the Accurate, Neutral, and Fast instruction conditions, and no significant increase in selection time was observed. These results suggest that Sun Menu reduces selection errors in dense VR radial menus without a significant increase in selection time.