I'm trying to get the hang of Python OCC, and honestly, it feels pretty overwhelming—like I'm building a library from scratch! My main goal is to convert CAD Step files into useful data such as counterbores and fillets. I'm experimenting with different elements like faces, cylinders, and edges, but I'm unsure if I'm going about it the right way. Has anyone here had experience with Python OCC and can offer some guidance?
3 Answers
For a smoother experience, you might want to consider using FreeCAD's own Python library instead. It’s designed to be simpler and built on OpenCascade, so you could still get similar functionalities without the hassle. Just make sure you check if it offers all the feature information you need!
I’ve been using Python OCC for a graphical interface in an engineering app, and it’s been working fine so far. Implementing it in a PyQt5 UI was smooth. Some features don’t have wrappers, but they’re mostly minor. I initially tried using FreeCAD, but ran into compatibility issues with the Python versions, which made it too complicated. Now, while I’m building commands from scratch, it’s not perfect but gets the job done for my uni project!
If you’re new to it, you might be asking, "What is Python OCC?" Just a heads up, it’s basically a set of loose bindings to a C++ library, so it doesn’t have that super Pythonic feel that many folks prefer.

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