Comment by MomsAVoxell
19 hours ago
Manifold (which is doing the heavy lifting in this) uses triangles, which are an approximation.
This is never going to have the accuracy seen in higher-end CAD circles, which use b-Reps: highly accurate mathematic representation.
Manifold is good for visualization, but to use it as an engine for manufacturing .. its limits will be hit.
Ah. That's good to know. I wondered how they did that. I can see doing it with triangles. Smooth curves are far more difficult.
I'm not an expert at this but I've done CNC machining, used Autodesk Inventor, and coded 3D collision detection. CSG engines were considered mathematical nightmares, and I've used them, but never been inside one. The good ones can take a cylinder and a thread profile, project the thread profile along a spiral as a cutting tool, and make a bolt. Then you can chamfer the end of the bolt, and the ends of the thread are correct.