Portraying an unfolding story within an immersive virtual environment (IVE) is difficult: In an IVE, participants can pay attention to and interact with whatever they choose within the scene. Moreover, the decisions taken by virtual characters must appear consistent with their personalities and motivations but also take into account the human participants' actions, whenever relevant. Finally, the results of the interactions should satisfy a pre-established plot. In this article, the authors introduce a new two-part approach that addresses the dilemma regarding freedom of action and narrative.

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