For entities you need your own obj model loader/renderer. For items/blocks you need to put your model and material(.obj and .mtl files) in an appropriate models subfolder in your assets, point to that model through a blockstates file for example(if you are using forge's blockstates for items) and you are done. There are a few thing you need to know: 1. When specifying an obj model to be used you must include the obj extension in the path too. 2. You must call OBJLoader.INSTANCE.ad
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