Interact2Ar: Full-Body Human-Human Interaction Generation via Autoregressive Diffusion Models

TL;DR

Interact2Ar is an innovative autoregressive diffusion model that generates realistic, full-body human-human interactions with detailed hand motions, adaptable to various scenarios and validated by new evaluation metrics.

Contribution

It introduces the first end-to-end text-conditioned autoregressive diffusion model for full-body human interactions, incorporating detailed hand kinematics and adaptive capabilities.

Findings

Achieves state-of-the-art performance in generating realistic interactions.

Enables real-time adaptation and extension to multi-person scenarios.

Provides new evaluation metrics for full-body interaction quality.

Abstract

Generating realistic human-human interactions is a challenging task that requires not only high-quality individual body and hand motions, but also coherent coordination among all interactants. Due to limitations in available data and increased learning complexity, previous methods tend to ignore hand motions, limiting the realism and expressivity of the interactions. Additionally, current diffusion-based approaches generate entire motion sequences simultaneously, limiting their ability to capture the reactive and adaptive nature of human interactions. To address these limitations, we introduce Interact2Ar, the first end-to-end text-conditioned autoregressive diffusion model for generating full-body, human-human interactions. Interact2Ar incorporates detailed hand kinematics through dedicated parallel branches, enabling high-fidelity full-body generation. Furthermore, we introduce an autoregressive pipeline coupled with a novel memory technique that facilitates adaptation to the inherent variability of human interactions using efficient large context windows. The adaptability of our model enables a series of downstream applications, including temporal motion composition, real-time adaptation to disturbances, and extension beyond dyadic to multi-person scenarios. To validate the generated motions, we introduce a set of robust evaluators and extended metrics designed specifically for assessing full-body interactions. Through quantitative and qualitative experiments, we demonstrate the state-of-the-art performance of Interact2Ar.