The only way direct gif to obj conversion makes sense, is to use the raster graphics from GIF files as textures for the mesh saved in OBJ format. But that is not much of direct file conversion, more like a work done using 3D modeling tool. We have not found any specifics about such conversion in particular, but similar topics are convered in various guides and tutorials about using raster graphics for 3D modeling purposes.
Updated: August 24, 2023