It's a great video. His source is here: https://github.com/3b1b/manim/blob/shaders/from_3b1b/active/sir.py https://github.com/3b1b/manim/blob/shaders/from_3b1b/

It's a great video. His source is here: https://github.com/3b1b/manim/blob/shaders/from_3b1b/active/sir.py https://github.com/3b1b/manim/blob/shaders/from_3b1b/active/...