question : why my rendered object is totally white

[weida wang]

Hello, thanks for sharing this pytorch3d render learning tutorail ! I am following this tutorial to render my object, this is the notebook and used assets:
render_demo2.ipynb.zip
BFM09_mesh_35709.obj.zip
face_color.mat.zip
This is the obj:

This is the rendered image:

Could you help me to have a look ?