3D Art/Indie Game Dev

So I searched for some time a while back on the best way to do this.  Even though it ended up being pretty much what I thought, it struck me that I didn’t easily find a concisely explained solution for this, so my intent is to provide one here.  This may not be a complete solution, based on your needs, but it’s at least a ground-work.

I started by making a bump map for the lens.  I used a reference image since my project was an actual car:

I then mapped the bump texture to the lens using the following node setup:

This is the result in material view-port shading:

And the result rendered:

Blocking in terrain and level layout for the first maze in my mobile project.  This is an early layout so a lot of the wall pieces will be replaced to break up the monotony and add variation to the environment.