The input file has to be Wavefront .OBJ with vertex normals ("vn") and all faces have to be triangles. The scaling factor "s" on line 23 needs to be adjusted for different model dimensions.
Make sure Pillow is installed.
py3d.py expects two rotation angles and a frame number on its command line.
The fastest way to create the animation is by piping the command for each frame into GNU Parallel:
python3 driver.py | parallel
The GIF can then be created with ImageMagick:
convert -delay 5 img*.png -loop 0 teapot.gif