| Immersive Virtual Reality projection systems, often known as CAVEs, are large enough to support multiple concurrent users, yet most have been designed to present a single stereographic image to a single, motion-tracked user. Previous efforts to accommodate multiple users have focused on providing multiple stereo pairs through increasingly complex and costly projection hardware. Some prior work in producing a single stereo image pair for multiple users does exist, but it is not well suited to the cube-like shape of many virtual reality systems. This work proposes novel rendering techniques which attempt to improve the user experience for pairs or small groups of co-located users in single-stereo-pair projection systems. Several techniques are evaluated in a human-subjects experiment, the results of which show that presenting views from the mean head position, with or without per-user stereo-pairs, improves the user experience by significantly increasing a user's sense of presence and by decreasing the incidence of simulator sickness. |
