How to get texture?

Hi, thanks for sharing the great work! In the result .obj file, I don't see 'vt' for texture. Can anyone help me understand how to get the texture? 
One more question: in the code, it seems that outputs are vertices only, and then the pre-defined faces are vertically stacked after all the vertices. So only vertices for the initial output? And how the faces were defined? 
Thanks!