The new and improved shader uses 3 passes like the one from Crysis 1 : http://www.slideshare.net/TiagoAlexSous ... s-gdc-2008 page 63,64 .
What you get in this shader: better rays, ability to change the color of the rays.
The cost is minimal.
The old shader ~175fps
The new shader ~170fps
The gui :
Thank you andrewmac for the help.