Side note - there's a really neat write-up by someone who realistically rendered a rotating black hole in 1979, partly by computer and partly by hand [0]. He go

Side note - there's a really neat write-up by someone who realistically rendered a rotating black hole in 1979, partly by computer and partly by hand [0]. He goes through all the important visual effects, like GR ray tracing, disk brightness, and Doppler shift. The final image is pretty cool. [0] - https://blogs.futura-sciences.com/e-luminet/2015/02/18/black-hole-imaging-2-heads-tails/ https://blogs.futura-sciences.com/e-luminet/2015/02/18/black...