OpenBuilding

I built a free, open-source 3D structural model viewer that runs in the browser I got tired of needing a license just to open a structural model to check something. So I built a viewer that works in the browser — drag in a STAAD file and it renders the structure with actual cross-section shapes (W-flanges, channels, angles, HSS, pipes), not generic cylinders. What it does: - Renders members with real cross-section geometry using the AISC v16 database (1,223 sections) - Click any member to see its section properties (area, Ix, Iy) - Solid, wireframe, and x-ray view modes - Works on desktop and mobile, runs fully client-side — nothing uploaded anywhere What it doesn't do (yet): - Only STAAD .std format right now. ETABS, SAP2000, ROBOT are planned but not started - Single-section members only — no double angles, double channels, or built-up shapes - Plate rendering is basic, steel name mapping only covers US conventions - No load display, no deformed shapes. Not an analysis tool It's not a replacement for analysis software. The idea is more practical: something you can pull up in a meeting or send to a client who doesn't own the software. Long-term I might add basic analysis, but right now it's purely a viewer. The code is MIT licensed. If anyone wants to contribute — a parser for another format, better section mapping for non-US standards, fixing an edge case you ran into — it's all welcome. The architecture is set up so adding a new format only touches the parser; the renderer doesn't need to change. Demo: https://openbuilding.vercel.app/ Repo: github.com/your-org/openbuilding Honest feedback and criticism are welcome too. If you try it with a file and something breaks, I'd like to know.