Schlieren

So what I did is I, I got the right material properties, and then I went and did the shot, and that first type of video you're looking at, that's called a shadowgraph.

It's not Schlieren.

It's called a shadowgraph.

In a shadowgraph, when you look through a block of polycarbonate, the reason you can see the shockwaves is, one way to say it, I heard a guy say it this way.