Found a fun bug in Rayon while recording this. As I make so few changes per frame, I don't clear the background each frame, instead only drawing the differences. I assume this is not how things are normally done, because when screen recording, it most of the time completely broke down, flashing black and forgetting the state of the screen. This became less of an issue when I reduced framerate and closed background processes. The final step to recording it was to constantly move my mouse over the Rayon window (and occasionally clicking), which seemed to keep the engine focused, making the rendering stable :)