SoMA: A Real-to-Sim Neural Simulator for Robotic Soft-body Manipulation
Authors: name: Mu Huang, name: Hui Wang, name: Kerui Ren, name: Linning Xu, name: Yunsong Zhou, name: Mulin Yu, name: Bo Dai, name: Jiangmiao Pang
Organization: shanghai ailab 

Simulating deformable objects under rich interactions remains a fundamental challenge for real-to-sim robot manipulation, with dynamics jointly driven by environmental effects and robot actions. Existing simulators rely on predefined physics or data-driven dynamics without robot-conditioned control, limiting accuracy, stability, and generalization. This paper presents SoMA, a 3D Gaussian Splat simulator for soft-body manipulation. SoMA couples deformable dynamics, environmental forces, and robot joint actions in a unified latent neural space for end-to-end real-to-sim simulation. Modeling interactions over learned Gaussian splats enables controllable, stable long-horizon manipulation and generalization beyond observed trajectories without predefined physical models. SoMA improves resimulation accuracy and generalization on real-world robot manipulation by 20%, enabling stable simulation of complex tasks such as long-horizon cloth folding.