Moving light sources on mobile?

Necroing the thread here…
This is just what I’ve been looking for! It works wonders for my Mobile App, however I have some questions that hopefully someone will be able to answer.
Using Z-enzyme method.
1: How do I make it cast shadows?
2: All the normals are removed, all surfaces became flat… I tried playing with roughness but this isn’t my forte so any input would be greatly appreciated here

Thanks!