InterPhys: Physics-aware Human Motion Synthesis in a Dynamic Scene

TL;DR

This paper presents a physics-aware human motion synthesis framework that models full human-related forces and interactions, ensuring physically plausible motions in dynamic scenes.

Contribution

It introduces a comprehensive force modeling approach with soft physical constraints and a novel contact force model for arbitrary surfaces, improving realism in motion synthesis.

Findings

Significantly enhances physical plausibility of generated motions.

Generalizes contact modeling to dynamic, moving objects.

Sets a new benchmark for physically consistent human motion generation.

Abstract

This paper tackles the problem of physics-aware human motion synthesis in a dynamic scene. Unlike existing works which mainly tend to generate physically unrealistic motions due to limited contact modeling, typically restricted to hands, in this paper, we introduce a physics-aware human motion generation framework that explicitly models the full spectrum of human-related forces, including human-object, human-scene, and internal body dynamics.~Our method imposes soft physical constraints to maintain force and torque balance, ensuring physically grounded motion synthesis. We further propose a novel continuous distance-based force model that generalizes contact modeling to arbitrary surfaces, capturing interactions not only with static environments but also with dynamic, moving objects. Extensive experiments show that our approach significantly improves physical plausibility and generalizes well to complex scenes, setting a new benchmark for physically consistent human motion generation.