3.8 Article

MAAIP: Multi-Agent Adversarial Interaction Priors for imitation from fighting demonstrations for physics-based characters

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ASSOC COMPUTING MACHINERY
DOI: 10.1145/3606926

关键词

Character Animation; Multi-Agent Reinforcement Learning; Adversarial Imitation learning; Physics-based Simulation; Motion Capture

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This paper proposes a Multi-Agent Generative Adversarial Imitation Learning based approach for simulating interactions and motions of multiple physics-based characters. The approach trains the system using two datasets, one with motions of a single actor and another with interactions between multiple actors. The method allows each character to imitate the interactive skills associated with each actor, while preserving their intrinsic style.
Simulating realistic interaction and motions for physics-based characters is of great interest for interactive applications, and automatic secondary character animation in the movie and video game industries. Recent works in reinforcement learning have proposed impressive results for single character simulation, especially the ones that use imitation learning based techniques. However, imitating multiple characters interactions and motions requires to also model their interactions. In this paper, we propose a novel Multi-Agent Generative Adversarial Imitation Learning based approach that generalizes the idea of motion imitation for one character to deal with both the interaction and the motions of the multiple physics-based characters. Two unstructured datasets are given as inputs: 1) a single-actor dataset containing motions of a single actor performing a set of motions linked to a specific application, and 2) an interaction dataset containing a few examples of interactions between multiple actors. Based on these datasets, our system trains control policies allowing each character to imitate the interactive skills associated with each actor, while preserving the intrinsic style. This approach has been tested on two different fighting styles, boxing and full-body martial art, to demonstrate the ability of the method to imitate different styles.

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