I'm trying to learn how to use OBJ models for my mod, but I'm having some difficulty getting started. I've been trying to find some tutorials or documentation on how to do import them and use them, but what I've found is out of date, and some of the functions are removed/renamed. I've looked at a few tutorials, including the 1.13 model section of the Forge Docs website (uses IStateMapper, which no longer exists), as well as this Forge forum tutorial (outdated, and many of the functions used no l