Building Browser-Based OpenBIM Viewers with IFC.js and WebAssembly
Deploying client-side OpenBIM web applications that parse IFC geometry and query structural BIM data directly inside modern browsers without cloud server rendering.
Traditional BIM software requires expensive desktop hardware to process complex IFC files. IFC.js uses WebAssembly to compile C++ IFC parsing logic into high-speed browser modules that render interactive building models right in JavaScript.
1. Parsing ExpressID and Spatial Trees
IFC schemas rely on hierarchical structures: IfcProject → IfcSite → IfcBuilding → IfcBuildingStorey. IFC.js parses these metadata relations on worker threads to build interactive UI tree navigation.
2. Raycasting and Element Property Selection
Clicking on a structural column or HVAC duct returns its unique expressID. Querying property sets (Psets) allows displaying material characteristics, acoustic ratings, and structural load metrics in side panels.
3. WebWorker Geometry Generation
Parsing large IFC models can freeze the browser main thread. Running IFC geometry extraction in background WebWorker threads guarantees liquid-smooth 60 FPS viewport manipulation during heavy file loading.