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.
Container for user-defined plugs. Nodes should never make their own plugs here, so users are free to do as they wish.
The processed output scene.
The on/off state of the node. When it is off, the node outputs the input scene unchanged.
The input scene
The shader to be assigned. This will be stored as an option within the scene globals.