The binary file will be loaded the next time we attempt to load the obj file reducing the loading time significantly. Tests have shown loading time reduction by 10 to 100 times depending on the size and structure of the original obj file. Loading myfile.obj will generate the following files in the same directory. myfile.obj.bin myfile.obj.json I'm not sure if you found the file command docs here: File command, however there is loads of info on it! To my understanding, you want to import a series of obj's from a source directory, forgive me if I'm wrong in but that's how I've interpreted your question.