I was looking for shaders listed in the mental ray reference (as you can find them in Maya / mental ray nodes), but non of that names found in XSI!
There are some shaders that match (like illumination, photon...), but for instance there aren't any of 'contour' shaders(like combi, silhouette etc.) especially SSS shaders!
What is going on here I'm missing?
(in previous Maya versions it was needed to retype some code, to have mental ray shaders appeared - is it a case here?)