I wrote an open source IFC viewer (open file format for construction purposes) that works on both Linux and Windows from the same code base. The UI is built on PyQt6, which then kicks off a nodejs/wasm process to extract data and geometry using WebIFC. The geometry is presented with three.js and displayed in the UI using a webview component.
This is still a dev preview, but work is well on its way to turn this into something useful.
The design intent was to make an IFC viewer that's cross-platform, performs as fast as possible and to be extensible. I'm currently working on the API part, but right now it's already a very fast and simple viewer that can potentially work as the backbone for someone's future planning- and cost estimation solution.
If you're interested, you can visit the repo on https://github.com/BIMtuitive/ifc-file-companion
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