<s>[INST] What do files ending in ".obj" contain? [/INST] Files ending in ".obj" contain 3D geometry data and information about the position, surface normals, and texture coordinates of the 3D object. The ".obj" file format is a simple ASCII text-based format that is widely used in computer graphics and animation to export and import 3D objects between various 3D modeling software applications.</s>\ <s>[INST] What is the difference between a .obj file and .fbx?  Are there any trade-offs in efficiency, licenses, or other areas that I should be aware of as a developer? [/INST] 