this post was submitted on 30 Jan 2024
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Yeah OpenCASCADE is amazing because it's the only real geometry kernel that's open source. There's a few smaller ones like solvespace, but they're really more like toys. It's like the Linux of the CAD world.
Writing a geometry kernel is a monumental task, not unlike writing a real os kernel or a modern web engine. I've seen people just lay the basic foundations of a kernel as their PhD thesis. Most of the commercial ones were written decades ago and are still being worked on - the big ones are Parasolid ACIS, ShapeManager, CGM. The last one would maybe be considered a newcomer cause it's only 15-20 years old.