Hey, author of Fornjot here. > Yes, I think he's being rather naive about that. Oh yes, definitely :-) Not in the sense that I think it's going to be easy, o

Hey, author of Fornjot here. > Yes, I think he's being rather naive about that. Oh yes, definitely :-) Not in the sense that I think it's going to be easy, or anything like that. But I'm definitely (and consciously) focusing on the immediate next steps, while not really having a long-term plan. I do have enough of an idea of what I want to achieve, to know which direction to go in. And I'm doing that one step at a time. This is definitely not the only way of tackling such a large problem. Someone else might approach this with a big vision and a solid plan, then use that to find the funding. I don't think either approach is inherently better, but the incremental approach is definitely a better fit for me. > Starting with flat surfaces and straight lines is really ignoring the hard problems and will likely require a complete rewrite later. IMHO support for NURBS surfaces is a requirement for CAD and export/import of STEP files as well. That's fair. And there are other valid criticisms as well, for example so far everything is single-threaded and CPU-based[1], which most likely won't do long term. The thing is, I'm not capable of designing and then implementing a multi-threaded NURBS-based CAD kernel. I lack the expertise and experience. But what I can do, is design/implement this CAD kernel in an incremental way, step by step. One could argue, what's happening right now is the design process, and the implementation is just a useful side effect. And we shouldn't forget, OpenSCAD exists and has its place. Something that's 80% as powerful, but has easy support for chamfers (and maybe some other goodies), would already be very useful to a lot of people. I'd rather focus on that and improve from there, than risk not getting anywhere, because I tried to tackle all the hard problems at once. > Having said that, if he keeps going it will be a good thing. Thanks! Maybe coupling the encouragement with criticism makes it more effective, not 100% sure :-) --- [1] What I mean is, everything in the CAD kernel is CPU-based. The graphics are done using a GPU, of course.