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Hi! I'm using my own renderer so I'm wondering if the OBJ format has a valid MTL file (material and texture description file) attached? For me to render the scene with OBJ format, I need each object to be mapped to a material in the MTL file so I don't need to spend a lot of time assigning the material and texture by myself. I believe some software can export the MTL files after the design is finished. Thanks.