Sun rays technical terms

breakneck

Hey guys,
I was wondering about the technical aspect and terms of sun/god rays. Looking them over in crysis 2 they look like they are special version of lensflare.
Does anyone know if there is a technical term for god rays and how something like this is achieved?
I'm not asking how to add them to a level - I know how to do that - But I'm curious as to what makes them work and how I would find out about making my own.

thanks.

example from crysis 1:
[ame="http://www.youtube.com/watch?v=l_7sNyKex_U"]youtube link[/ame]

cryrid

Crepuscular and anticrepuscular rays if you wanted to get fancy. As for making your own, I'll leave that to someone more knowledgeable on the subject to answer.

equil

radial blur

breakneck

equil,
right on - thanks! tracked down the info I needed.

Xendance

http://http.developer.nvidia.com/GPUGems3/gpugems3_ch13.html