OBJ (or .OBJ) is a geometry definition file format first developed by Silicon Graphics for its WaveFront 3D animation package. The file format is open and has been adopted by other 3D graphics application vendors and can be imported/exported from e-Frontier's Poser, Alias's Maya, Blender and 3D Studio Max, Hexagon, Newtek Lightwave, etc. For the most part a universally accepted format.