PhysHanDI: Physics-Based Reconstruction of Hand-Deformable Object Interactions

TL;DR

PhysHanDI is a physics-based framework that jointly reconstructs 3D hand and deformable object interactions, improving accuracy by simulating realistic object deformations driven by hand motions.

Contribution

It introduces a novel physics-based approach for simultaneous 3D reconstruction of hands and non-rigid objects, bridging a gap in existing methods.

Findings

Outperforms state-of-the-art in reconstruction accuracy

Enhances future prediction of hand-object interactions

Physically plausible deformations improve hand reconstruction

Abstract

While existing methods for reconstructing hand-object interactions have made impressive progress, they either focus on rigid or part-wise rigid objects-limiting their ability to model real-world objects (e.g., cloth, stuffed animals) that exhibit highly non-rigid deformations-or model deformable objects without full 3D hand reconstruction. To bridge this gap, we present PhysHanDI (Physics-based Reconstruction of Hand and Deformable Object Interactions), a framework that enables full 3D reconstruction of both interacting hands and non-rigid objects. Our key idea is to physically simulate object deformations driven by forces induced from densely reconstructed 3D hand motions, ensuring that the reconstructed object dynamics are both physically plausible and coherent with the interacting hand movements. Furthermore, we demonstrate that such simulation of object deformations can, in turn, refine and improve hand reconstruction via inverse physics. In experiments, PhysHanDI outperforms the state-of-the-art baseline across reconstruction and future prediction.