In this paper we present a large-area interactive mixed reality system where multiple users can experience an event simultaneously. Through the combination of a number of innovative methods, the system can tackle common problems that are inherent in most existing mixed reality solutions, such as robustness against lighting conditions, static occlusion, illumination correction, registration and tracking etc. Most importantly, with our proposed experience server, a shared event among multiple

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... s is seamless. The experience server tracks every user's position and experience state and presents a unique viewpoint of the event to multiple users simultaneously. The effectiveness of the system is demonstrated through an example application at a heritage site, where we perform user testing through multiple focus groups.