Matt, in march you announced the steps of your planned optimisations and talked about increasing the max ray depth to 13 with a default value of 5. Is it already there, and I can't find it, or is it yet to implement?
I'm asking, because at the moment it's difficult to render heads using glass shaders for subsurface scattering plus some more glass shaders for the eyes: corneas and wetness and so on without having some of the parts rendering quite dark or even black.