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There are loads of edge cases and gotcha's as well. I have a full(ish) parser here with unit tests if it helps. (Note I use pystring to do the string processing). https://github.com/NCCA/NGL/blob/main/src/Obj.cpp unit tests here https://github.com/NCCA/NGL/blob/main/tests/ObjTests.cpp. May give you some ideas.
I've got a basic obj parser in my ray tracing project: https://github.com/aromanro/RayTracer
I also ported it in an opengl project: https://github.com/aromanro/SolarSystem
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