Provides a reference to a Sub-graph Asset. All ports on the reference node are defined by the properties and outputs defined in the Sub-graph Asset. This is useful for sharing functionality between graphs or duplicating the same functionality within a graph.
Sub-graph Nodes and Shader Stages
If a Node within a Sub-graph specifies a Shader Stage, such as how Sample Texture 2D Node specifies the fragment Shader Stage, then that entire Sub-graph is now locked to that stage. As such a Sub-graph Node that references the graph will also be locked to that Shader Stage.