PhysDreamer: Physics-Based Interaction with 3D Objects via Video Generation

TL;DR

PhysDreamer is a physics-based method that synthesizes realistic, interactive 3D object dynamics from static models by leveraging video generation priors, enabling more immersive virtual experiences.

Contribution

It introduces a novel approach to generate physics-based object interactions without explicit physical property measurements by distilling priors from video models.

Findings

Successfully synthesizes realistic object responses to interactions.

Demonstrates effectiveness on elastic objects.

User study confirms realism of interactions.

Abstract

Realistic object interactions are crucial for creating immersive virtual experiences, yet synthesizing realistic 3D object dynamics in response to novel interactions remains a significant challenge. Unlike unconditional or text-conditioned dynamics generation, action-conditioned dynamics requires perceiving the physical material properties of objects and grounding the 3D motion prediction on these properties, such as object stiffness. However, estimating physical material properties is an open problem due to the lack of material ground-truth data, as measuring these properties for real objects is highly difficult. We present PhysDreamer, a physics-based approach that endows static 3D objects with interactive dynamics by leveraging the object dynamics priors learned by video generation models. By distilling these priors, PhysDreamer enables the synthesis of realistic object responses to novel interactions, such as external forces or agent manipulations. We demonstrate our approach on diverse examples of elastic objects and evaluate the realism of the synthesized interactions through a user study. PhysDreamer takes a step towards more engaging and realistic virtual experiences by enabling static 3D objects to dynamically respond to interactive stimuli in a physically plausible manner. See our project page at https://physdreamer.github.io/.