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Natural behavior of a single artificial intelligence or even entire groups is a great challenge but also necessary for the immersion in video games. The object of this work is to find and implement the best technique for the behaviors of the simulated people in Cosmonautica , Chasing Carrots next game. The comparison of the different decision-making techniques shows that behavior trees combined with utility functions are the best choice due to their overall composition of flexibility, quality, performance, re-usability, and maintainability. Now, behavior trees are used in Cosmonautica to control the behavior of crewmembers in the player´s space ship. They determine e.g. in which situations the crew members work or when a need has to be satisfied. Utility functions are used to compare all possible actions to decide which work task or activity needs to be done. This combination of behavior trees and utility functions has proved to be an easy and powerful way to control the behavior of artificial intelligences.

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Philipp Erler studied Software Engineering at the University of Applied Sciences in Esslingen. Since the practical semester, he has been working Chasing Carrots, a small independent game developer in Stuttgart. Now, the practical part of his bachelor s thesis powers the artificial intelligence in Cosmonautica.

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