reference/physdreamer/README.md

PhysDreamer Reference Assets

Source: YunjinZhang/PhysDreamer Paper: PhysDreamer: Physics-Based Interaction with 3D Objects via Video Generation Licence: MIT

Contents

scenes/

Four real-world scenes with RGB-D observations and optimized 3D Gaussians:

Scene	Description
alocasia	Potted plant (flexible leaves)
carnation	Carnation flower (bendable stem)
telephone	Telephone handset (rigid + soft cord)
hat	Woven hat (flexible brim)

Each scene directory contains:

• point_cloud/iteration_*/point_cloud.ply — 3DGS model (use as --gaussians input to squishy-build)
• images/ — training RGB frames
• cameras.json — camera extrinsics and intrinsics

models/

Optimized velocity fields and material fields for each scene:

• velocity_field.pt — PhysDreamer learned velocity field (per-particle trajectory prior)
• material_field.pt — optimized material parameters {E, nu, rho} per spatial region

Usage with squishy

# Use as gaussians input for squishy-build:
# squishy-build --gaussians reference/physdreamer/scenes/carnation/point_cloud/ \
#               --mesh carnation_mesh.obj --name carnation

# Use material field as initial parameter estimate for system ID:
from squishy.train.system_id import run_system_id_physics3d
# load material_field.pt to initialize E_init, nu_init

Citation

@article{zhang2024physdreamer,
    title={PhysDreamer: Physics-Based Interaction with 3D Objects via Video Generation},
    author={Tianyuan Zhang and Hong-Xing Yu and Rundi Wu and
            Brandon Y. Feng and Changxi Zheng and Noah Snavely and Jiajun Wu and William T. Freeman},
    journal={arXiv},
    year={2024}
}