In this paper, we present a technique for the collaboration among the members of computer generated action team in the virtual environment. We research a multiagent model in artificial intelligence and put our emphases on the structure of the team members. We analyze the hierarchical relationship among team members in the real world and apply it to computer generated team. In this approach, we present a hierarchical collaboration model based on the planned team activity model. The hierarchical relationship among the team members is organized as a hierarchical tree and each member of the team maintains this relationship. To maintain the hierarchical relationship, this paper also gives some atom rules and functions to adapt the dynamic environment. Using our improved model, the team can work effectively and dynamically in real time. The result shows that by using the hierarchical model the collaboration among the team members in the virtual environments is improved.
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