http://www.solidangle.com/arnold/download/   arnold download page with new sdk

http://www.solidangle.com/arnold/download/third-party/  arnold third party download some very cool shaders with source

{

ketty is more simple

al shader has more advance functions, like control sample in shader. but it is more complex.

The first aim is rewrite aistandard aisss with more aov

like direct/indirect indensity, surface, ao. fresnel,

}