| title | Scenes as Objects, Not Primitives: Instance-Structured 3D Tokenization from Unposed Views |
|---|---|
| authors | Mijin Yoo, In Cho, Subin Jeon, Jiwoo Lee, Eunbyung Park, Seon Joo Kim |
| date | 2026-06-28 |
| venue | arXiv (preprint, not peer reviewed) |
| id | arXiv:2606.29513 |
| upvotes | 51 (Hugging Face Daily Papers, 2026-11-01) |
| links | abs pdf hf |
| abstract | A 3D scene is understood through its objects, not the primitives that compose them. Yet feed-forward reconstruction methods output dense, unstructured sets of points or Gaussians, leaving object-level structure to be recovered after the fact. We propose a feed-forward framework that decomposes a scene into instance-structured 3D token groups directly from unposed multi-view images -- compact object-centric units from which reconstruction, segmentation, and manipulation all follow. Each token group pairs an instance token capturing entity-level identity with anchor tokens that encode local geometry and appearance, which are decoded into a set of 3D Gaussians. This two-level factorization decouples object identity from local appearance, making object instances a native interface of the representation rather than a derived product. The token groups are learned through differentiable rendering with joint reconstruction and segmentation supervision, requiring no 3D annotations. Our feed-forward model surpasses per-scene optimization baselines in class-agnostic instance segmentation while remaining competitive in novel view synthesis. Beyond these metrics, the same token groups directly unlock instance-level scene editing -- removing, translating, or inserting objects by operating on their groups -- as well as efficient open-vocabulary 3D instance retrieval, where retrieval complexity scales with the number of instances rather than primitives. |
cite
@misc{yoo2026scenes,
title={Scenes as Objects, Not Primitives: Instance-Structured 3D Tokenization from Unposed Views},
author={Mijin Yoo and In Cho and Subin Jeon and Jiwoo Lee and Eunbyung Park and Seon Joo Kim},
year={2026},
eprint={2606.29513},
archivePrefix={arXiv},
url={https://arxiv.org/abs/2606.29513}
}