I am just trying to use the new Render Pass node in lops. And am not sure about how it works. My thoughts was that it set up convenient set of collections and other settings. But I can't seem to figure out how to access those collections downstream from the node. If anyone used this yet or can point me to a more detailed bit of documentation I would really appreciate it.

essentially in Render Pass Primitive you define which primitives should be rendered, which should be matte and which phantom, ...

then you can apply one of the Render Pass primitives down the line by specifying it in:

- Viewport (Persp dropdown/Render Pass)
- USD Render ROP (Render Pass parm)
- Live Render ROP (Render Pass parm)