CyclesBackground

Assigns global shaders such as background and atmosphere shaders. This node is an abstract base class, so it can not be used directly - instead use the nodes derived from it.

user

Container for user-defined plugs. Nodes should never make their own plugs here, so users are free to do as they wish.

out

The processed output scene.

enabled

The on/off state of the node. When it is off, the node outputs the input scene unchanged.

in

The input scene

shader

The shader to be assigned. This will be stored as an option within the scene globals.