This node defines the terrain to export to Houdini when Instant Terra is used through Houdini. The project must contain a single Terrain to Houdini node.
To add an Terrain to Houdini node, right-click in the Graph Editor and select Create Node > Export > Terrain to Houdini or use the keyboard shortcut NTTH (Node Terrain To Houdini).
This node has no parameters.
Full documentation can be found here: Bridge to Houdini documentation.