Did you pre-game any of this? [You seem to have all the steps down and you're speaking in the past tense when you explain yourself.]
I had a little think before the stream of how I did it and what I was going to talk about. So it's not completely off the cuff. But yeah, I may have done it before. It might be a surprise. We'll see how far we get.
People who watch the game dev streams know that you very rarely, if ever, can make something in an hour.
In that case, yeah, the gig's up. I've made this before, guys. But I'm going to show you the steps.