The whole business of cloud rendering is quite interesting, and pretty heavy. This guy (Mark Harris) did a paper on it here: http://www.markmark.net/dissertation/harrisDissertation.pdf This girl, Niniane Wang worked on FSX and is now at Google: http://ofb.net/~niniane/clouds-jgt.pdf Interesting stuff.
John, wonderful set!! I have to ask; how were you able to render the "Rayleigh scattering" atmosphere effects in number 1 through 3? Is that Maxx FX? Thank you.