Lessons: https://www.sidefx.com/tutorials/foun...
To bring the landscape into game engines such as Unreal Engine or Unity, start by creating a Houdini Digital Asset. Once you have the Houdini Engine plug-in set up properly, then this asset can be loaded into the game editor with the copied tree stand-ins importing as instanced objects. When you import the terrain into Unreal Engine, the heightfields will be recognized as a landscape. You can also import the asset into Unity using the Houdini Engine plug-in.