Engine-Native Editable 3D World Reconstruction with Objects and Lighting

Junhao Chen; Xinghao Chen; Henghaofan Zhang; Zihao Qiao; Saining Zhang; Yongzhi Li; Ruqi Huang; Sisi Li; Yimin Sheng; Jianyi Zhu; Hao Zhao

arXiv · 2607.20889

Engine-Native Editable 3D World Reconstruction with Objects and Lighting

Junhao Chen·Xinghao Chen·Henghaofan Zhang·Zihao Qiao·Saining Zhang·Yongzhi Li·Ruqi Huang·Sisi Li·Yimin Sheng·Jianyi Zhu·Hao Zhao

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Abstract

Editable 3D scene creation requires object instances and lights that can be inspected, moved, and imported into standard engines, yet existing single-image methods largely stop at room-scale geometry, baked/global illumination, or text-driven generation. We introduce Lumera (Light-aware Unified Engine-native Reconstruction and Assembly), a benchmark and reference pipeline for engine-native, light-aware 3D scene parsing from a single image. Lumera-2K is built from 2,513 UE5 projects and provides 3.73M components, 63M object instances, 102.6K engine-native parametric lights, and 95.1K camera views. On this data, Lumera-Box and Lumera-Light adapt VLM to parse object boxes and parametric light tuples (x,y,z,r,g,b,I), which are assembled with per-object mesh reconstruction, HDR environment estimation, and a bounded agentic refinement loop. In a sanitized box benchmark against DetAny3D, SpatialLM, N3D-VLM, and WildDet3D, Lumera-Box obtains the strongest overall detection, geometry, semantic, and layout scores (merged mAP 0.1141, IoU-B 0.2472, F-score 0.2762), while WildDet3D remains stronger on anchor recall. For lights, Lumera-Light recovers almost all non-empty scenes (recall 0.998) but remains limited at individual-light localization (F1 0.209 at 0.5 m); matched lights have median position error 0.261 m, median ΔE2000 4.59, and intensity Pearson r=0.628. These results establish parametric lights as a measurable editable-scene target and expose remaining bottlenecks in relation structure, light recall/intensity, and cross-engine generalization.

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BibTeX RIS

Junhao Chen, Xinghao Chen, Henghaofan Zhang, Zihao Qiao, Saining Zhang, Yongzhi Li, Ruqi Huang, Sisi Li, Yimin Sheng, Jianyi Zhu, Hao Zhao. 2026-07-23. Engine-Native Editable 3D World Reconstruction with Objects and Lighting. https://arxiv.org/abs/2607.20889

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