I have no experience with either Slim or XSI. My expertise is limited to Maya, MayaMental, 3Delight with Maya (which uses Hypershade), and MAX.

Personally I find XSI also to be a confusing package with convoluted workflow. I don't use it.

DR

RMB > Collapse is there, but your mouse cannot be on top of your SHOP node when pressed. Try selecting a node, then taking your mouse somewhere else with empty space and right-clicking.

Either that or just select your nodes and hit Shfit+C

I would suggest purchasing Digital Tutors Intro to rendering with Mantra.
It might be an insult if you are an experienced user of MR, but I use MR myself in Maya, and actually got lots of useful information from this training video.

Generally I don't like DT all that much, but this one is OK.

Just a tip. And, It's the docs off course.

:roll: