Virtual Storyteller

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Strong Points

• Emergent narrative approach: narrative is not explicitly represented but emerges from autonomous characters.
• Agents are not just self-interested characters but also drama-interested actors. The implementation of this second role is informed by techniques used in improvisational theatre (Swartjes & Vromen 2007). They can select external events and retrospectively adapt the initial state of the story for dramatic reasons.

Limitations

• No emotion model or support for authoring character emotions.
• Model for global narrative control remains limited.
• Currently no interface for user interaction.

Main Publications

• Swartjes, I., & Theune, M. (2009). Iterative Authoring Using Story Generation Feedback: Debugging or Co-creation? In I. A. Iurgel, N. Zagalo, & P. Petta (Eds.), Interactive Storytelling (Vol. 5915, pp. 62–73). Berlin / Heidelberg: Springer.
• Swartjes, I., Kruizinga, E., & Theune, M. (2008). Let's Pretend I Had a Sword: Late Commitment in Emergent Narrative. In U. Spierling & N. Szilas (Eds.), Interactive Storytelling (Vol. 5334, pp. 264–267). Berlin / Heidelberg: Springer.
• Swartjes, I., & Theune, M. (2008). The Virtual Storyteller: Story Generation by Simulation. In A. Nijholt, M. Pantic, M. Poel, & H. Hondorp (Eds.), BNAIC 2008, Proceedings 20th Belgian-Netherlands Conference on Artificial Intelligence (pp. 257–264). Enschede: University of Twente.
• Swartjes, I., & Vromen, J. (2007). Emergent Story Generation: Lessons from Improvisational Theater. In Intelligent Narrative Technologies: Papers from the AAAI Fall Symposium (pp. 147–150). Menlo Park: AAAI Press.
• Swartjes, I., & Theune, M. (2006). A Fabula Model for Emergent Narrative. In S. Göbel, R. Malkewitz, & I. Iurgel (Eds.), Technologies for Interactive Digital Storytelling and Entertainment (Vol. 4326, pp. 49–60). Heidelberg: Springer.

Supporting Narrative Theories

The Virtual Storyteller draws inspiration from improvisational theatre (Swartjes & Vromen 2007). In the poetics of improv, character interaction yields the additive collaborative construction of a story, in contrast to the neo-Aristotelian poetics in which author-given plots determine the necessary character behaviour.

The fabula of the generated narratives is captured and respresented by the system, using a formal model based on Trabasso's causal network theory of story comprehension (Swartjes & Theune 2006).

Computational Model

The Virtual Storyteller is a Multi-Agent System in which agents are implemented using a BDI-based character model. The agents use an adapted version of partial-order planning.