Also, the Inigo Quilez website is a great reference: https://iquilezles.org/ https://iquilezles.org/ He is essentially the god of shaders effects like this. He

Also, the Inigo Quilez website is a great reference: https://iquilezles.org/ https://iquilezles.org/ He is essentially the god of shaders effects like this. He is the one who made Shadertoy, the non code-golfed version of the cloud effect, and the second video you linked, among many other things.