Virtual world objects for real-time cooperative design

This proposition presents a system architecture for the "rapid prototyping" of manufacturing products. This architecture satisfies the following requirements: cooperative design of a shared virtual world, concurrent and real time interactions of different users, dynamic distribution of the virtual scene over the different users, distributed world consistence, persistence and faults recovery. Currently, few solutions answer entirely these requirements. The virtual scene is dynamically distributed over private spaces according to the cooperative interactions. A user is aware in real time of the operations carried out by the other participants.A distributed concurrency control allows consistent operations on the distributed scene tree. The persistence is provided in a distributed way. A user can go on working despite the faults of other machines