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arXiv · 2611.07961

Bri3D: Bridging the Object-Scene Gap in Single-Image 3D Generation via Scene-Anchor

Hongye Hou·Shuai Zhang·Hongjie Li·Zhuoxiao Li·Haiping Wang·Yuan Liu·Wufan Zhao
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Abstract

Generating compositional 3D scenes from a single image requires recovering detailed object geometry and coherent spatial arrangements. Existing object-to-scene methods, including SAM3D and MIDI, extend object generation through image-context reasoning or inter-instance modeling. Coordinating objects remains challenging with limited scene-level supervision. Directly extending object-centric generators to entire scenes can degrade geometry and fail to preserve instance scale, orientation, and pose. We propose Bri3D, a framework bridging scene-level structural reasoning and object-level generative priors through instance-aware voxel scene anchors. Bri3D predicts a color-coded scene scaffold encoding coarse object geometry and spatial arrangements. Each instance is extracted as a scene anchor and refined into a pose-preserving, prior-compatible voxel support, enabling a frozen object generator to synthesize detailed textured geometry in the anchor-defined spatial reference. This coarse-to-fine design separates scene organization from object-scale detail synthesis, focusing scene-level training on spatial organization and anchor refinement while reusing pretrained object priors. Experiments demonstrate improvements in scene layout, object geometry, visual quality, and generalization. Bri3D predicts scene layouts efficiently; full scene generation is faster than SceneGen and SAM3D.

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Hongye Hou, Shuai Zhang, Hongjie Li, Zhuoxiao Li, Haiping Wang, Yuan Liu, Wufan Zhao. 2026-11-05. Bri3D: Bridging the Object-Scene Gap in Single-Image 3D Generation via Scene-Anchor. https://arxiv.org/abs/2611.07961

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