For the final of UCLA's Math 32BH, I foolishly decided to write a paper attempting to take the reader from the basic mechanics of light and space to a Kerr black hole gravitational renderer, based off of the work James, Tunzelmann, Franklin, and Thorne did for INTERSTELLAR .
Basically, it's a vertical slice of relativity!
Check out the Shadertoy link for a real-time demo!