BIMScript: Material-Aware Structured Scene Programs for BIM Ingestion

Prakash Kondibhau Naikade · Thomas B. Moeslund · Andreas Møgelmose

AI:Xpertise Lab · Visual Analysis and Perception Laboratory, Aalborg University · Pioneer Centre for Artificial Intelligence

Project page · arXiv · Paper

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BIMScript reconstructs an indoor scene as a short program of parametric commands in which every element carries not only geometry but the material and condition that define a building model — and each command maps one-to-one onto a native Revit/IFC object.

• What — per-element material= and condition= attributes, supervised by a VLM-distilled material passport over 1.9M elements across ~100k scenes.
• Fast — decoding is bound by overhead, not compute: an output-exact CUDA-graph decoder cuts 6.40 → 1.91 ms/step (3.4×), composed with grammar-parallel draft-and-verify.
• Exactly where — a bounded sub-bin offset head lifts coordinates off the 5 cm token grid.

Code

Code release is in preparation. Planned repositories in the BIMScriptWorld organization:

Repository	Contents	Status
BIMScript	training, evaluation and decoding	coming soon
bimscript-passport	material-passport extraction pipeline and corpus	coming soon
bimscript-revit	pyRevit add-in and IFC4 export	coming soon

Project page

Source lives in docs/ and is served by GitHub Pages at https://BIMScriptWorld.github.io/BIMScript/. To preview locally:

cd docs && python -m http.server 8000   # then open http://localhost:8000

Citation

@article{naikade2026bimscript,
  title   = {BIMScript: Material-Aware Structured Scene Programs for BIM Ingestion},
  author  = {Naikade, Prakash Kondibhau and Moeslund, Thomas B. and M{\o}gelmose, Andreas},
  journal = {arXiv preprint arXiv:ARXIV_ID},
  year    = {2026}
}