All videos here https://www.sidefx.com/tutorials/procedural-desert/

Building large scale environment for games can consist of several key elements including the base terrain, scattered landscape features, foliage and man-made props. In this lesson, learn how to set up all of these elements using procedural techniques in Houdini. Starting with terrain, you will create a layered desert landscape tool that can be opened up in UE4 using the Houdini Engine version 2 plugin. You will then use the scatter and align and mask by feature tools to create a scattering and instancing workflow. In the end, you will use PDG to create multiple terrain tiles that are populated automatically. You will also learn how to integrate your Houdini assets with the World Composition tools in UE4.