What are "nodes" ?

IceScribe

I have seen mentioned in various posts about "creating nodes" in 4.15 but  I don't understand what is meant by these nodes, or why I would create them, and where are they created? I figured out how to get my familiar Iray Render settings back by changing the Draw style. What is the advantage of "creating nodes?" What might go wrong in 4.15 if I don't use them?  I can find discussions but not explanations, maybe because I am not using a good search term.

Richard Haseltine

Nodes are the things that appear in the Scene pane - figures, bones, props, nulls, groups, lights, cameras.... I guess you are asking about the new singleton nodes which carry the Environment and Tonemapper options.