BuildingBRep-11K: Precise Multi-Storey B-Rep Building Solids with Rich Layout Metadata

• URL: http://arxiv.org/abs/2506.15718v1
• Date: Tue, 03 Jun 2025 03:44:34 GMT
• Title: BuildingBRep-11K: Precise Multi-Storey B-Rep Building Solids with Rich Layout Metadata
• Abstract summary: BuildingBRep-11K is a collection of 11 978 multi-storey (2-10 floors) buildings (about 10 GB)<n>Every sample consists of a geometrically exact B-rep solid-covering floors, walls, slabs and rule-based openings.<n>To verify the dataset's learnability we trained two lightweight PointNet baselines.
• Score: 5.436963837926521
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: With the rise of artificial intelligence, the automatic generation of building-scale 3-D objects has become an active research topic, yet training such models still demands large, clean and richly annotated datasets. We introduce BuildingBRep-11K, a collection of 11 978 multi-storey (2-10 floors) buildings (about 10 GB) produced by a shape-grammar-driven pipeline that encodes established building-design principles. Every sample consists of a geometrically exact B-rep solid-covering floors, walls, slabs and rule-based openings-together with a fast-loading .npy metadata file that records detailed per-floor parameters. The generator incorporates constraints on spatial scale, daylight optimisation and interior layout, and the resulting objects pass multi-stage filters that remove Boolean failures, undersized rooms and extreme aspect ratios, ensuring compliance with architectural standards. To verify the dataset's learnability we trained two lightweight PointNet baselines. (i) Multi-attribute regression. A single encoder predicts storey count, total rooms, per-storey vector and mean room area from a 4 000-point cloud. On 100 unseen buildings it attains 0.37-storey MAE (87 \% within $\pm1$), 5.7-room MAE, and 3.2 m$^2$ MAE on mean area. (ii) Defect detection. With the same backbone we classify GOOD versus DEFECT; on a balanced 100-model set the network reaches 54 \% accuracy, recalling 82 \% of true defects at 53 \% precision (41 TP, 9 FN, 37 FP, 13 TN). These pilots show that BuildingBRep-11K is learnable yet non-trivial for both geometric regression and topological quality assessment

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