pwsurface2 ? do i need it for ds4.6 or is it already included?

was just reading this http://www.daz3d.com/pwsurface-2
i don't understand most of it.
do i need this for my ds4.6?
Fresnel reflection and refraction for enhanced realism - sounds interesting
wondering if this surface thing would help with water shader
Post edited by Mistara on