what does obj mean
OBJ (or .OBJ) is a geometry definition file format first developed by Wavefront Technologies for its Advanced Visualizer animation package.The file format is open and has been adopted by other 3D graphics application vendors. For the most part it is a universally accepted format.TL files are commonly accompanied by and referenced from OBJ files that define geometry upon which the materials of the MTL file are mapped. The MTL format, although still widely used, is outdated and does not fully support later technologies such as specular maps and parallax maps.