| title | WorldSculpt: Generating Compositional Worlds from Grounded Videos |
|---|---|
| authors | Muyao Niu, Jixuan He, Ruihan Yu, Lian Fu, Yonghao Yu, Zheng-Hui Huang, Yifan Zhan, Fengbo Lan, Yongtao Ge, Yinqiang Zheng, Kaipeng Zhang, Zhixiang Wang |
| date | 2026-09-04 |
| venue | arXiv (preprint, not peer reviewed) |
| id | arXiv:2609.05416 |
| upvotes | 24 (Hugging Face Daily Papers, 2026-11-01) |
| links | abs pdf hf code |
| abstract | We study the problem of generating a compositional 3D representation of a cluttered scene containing hundreds of objects. The goal is to represent the scene as a collection of individual object meshes placed in a shared world frame, as required by downstream applications such as gaming, AR/VR, simulation, and robotics. This task is challenging in densely cluttered scenes, where objects heavily occlude one another and each view reveals only a fraction of their geometry. Geometry-based approaches typically reconstruct the scene as a single representation and leave incomplete geometry in occluded regions, while existing compositional methods with generative priors are largely limited to relatively simple scenes. We show that complex scenes with hundreds of objects can instead be generated compositionally by adapting a strong single-object 3D generative prior to multi-view observations. We instantiate this paradigm with Pixal3D, extending it with a multi-view conditioning pathway that grounds object generation in multiple posed observations. Although the model is finetuned entirely on single objects in canonical space, it generalizes to large scenes with severe occlusion without any scene-level training, demonstrating the feasibility and scalability of this paradigm. We further introduce UE-MeshyScene, a photorealistic benchmark of densely cluttered scenes with hundreds of objects, per-object annotations, and ground-truth meshes. Across single-object, controlled multi-object, and UE-MeshyScene evaluations, our method consistently outperforms prior approaches, with larger gains as scene complexity and occlusion increase. Finally, we demonstrate broader applicability by converting generated 3DGS worlds, such as Marble and HY-World 2.0, into compositional mesh scenes. |
cite
@misc{niu2026worldsculpt,
title={WorldSculpt: Generating Compositional Worlds from Grounded Videos},
author={Muyao Niu and Jixuan He and Ruihan Yu and Lian Fu and Yonghao Yu and Zheng-Hui Huang and Yifan Zhan and Fengbo Lan and Yongtao Ge and Yinqiang Zheng and Kaipeng Zhang and Zhixiang Wang},
year={2026},
eprint={2609.05416},
archivePrefix={arXiv},
url={https://arxiv.org/abs/2609.05416}
}