In an effort to start putting concepts together, I’ve combined some parts from two of my initial efforts (the interactive sphere and Perlin noise) into a single demonstration.  I’ve also been interested in understanding how Fresnel reflection and refraction work, and so today I spent my afternoon assembling a fun shader to do all of this.  The subtle challenges inherent in this shader:

1. Getting the Perlin noise to scroll infinitely to the right
2. Using a Fresnel reflection and a Fresnel refraction
3. Doing it all by ray tracing a sphere