NOTE: This has since been moved to:
http://blog.cameronleger.com/code/ptc_uber_light_shader/
I’ve compiled the shader as a light shader now.
You can’t have multiple atmosphere shaders on top of the same object, so that was limiting. With both ways, you can render out multiple effects at one time. The difference being that with the atmosphere shader, you have one shader with many effects and a pass for each effect, and with the light shader you have lots of light shaders you can link … Read the rest