Sub Graph node reference
The Sub Graph node provides a reference to a Sub Graph. Use Sub Graphs to share functionality between shader graphs, or duplicate the same functionality within a graph.
The inputs and outputs of a Sub Graph node are defined by the properties and outputs of the Sub Graph. For more information, refer to Create a Sub Graph.
The preview in the Sub Graph node displays the first output of the Sub Graph.
Some built-in nodes are Sub Graph nodes, for example the ThreadMapDetail node and the SpeedTree nodes.