Funny you say that, I started drafting a little write-up on the process. I don't have a recording of my work but I did output a few gifs along the way.
I'm still lost on some of the gifs you posted, it looks like flipped normals from the top down light
But the edges have a "shimmer" of gray and light blue that I don't follow completely. Lmk if you ever post that write up or revisit that technique, really great stuff.
