garrr opened this issue on Sep 08, 2006 · 25 posts
bagginsbill posted Sat, 09 September 2006 at 7:12 PM
By the way, I didn't have the heart to tell you that nobody should be using this glow thingy on the earth.
The earths atmosphere is generally agreed to be 40 miles thick, although arguably airplanes control surfaces are almost completely useless at only about 25 miles, even at Mach 5.
Anyways, since the diameter of the earth is about 8000 miles, then the ratio of atmosphere to diameter is 40/8000 or 1/200. So if you are rendering an earth in your picture that is 200 pixels across, then the atmosphere should be 1 pixel thick.
I made the shader do much more than that, so you could see it.
It would be easy enough to use a different ratio, but you'd not get to see it unless you were doing a close orbit shot. If anybody wants that, let me know.
Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)