World Machine To Unreal Engine
World Machine can serve as an excellent terrain generator for Unreal Engine-based maps.
The ability to export both terrain and custom terrain texture alphamaps is a huge advantage and speedup in your workflow. Unreal Engine natively supports Raw-16 import and export, greatly simplifying your workflow to and from World Machine!
Within World Machine
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Place a Height Output device into your world. Wire the terrain you wish export into the device's input.
You can also export a colormap by placing a Bitmap Output and connecting it appropriately.
Choose your export formats within the File Output device. You should use the RAW16 format.
Determine your resolution. Unreal Engine has some unique requirements for the resolution of your heightfield; consult the engine's Landscape documentation for the recommended sizes.
Build your world and export all files. The "Export Terrain files..." option from the File Menu provides a central location to do both.
Import into Unreal Engine
With the Landscape terrain type, it's easy to import from World Machine. Simply enter Landscape Mode in the editor, and under the "Create New" tab, point the editor at the exported r16 file from World Machine. Make sure PC byte ordering and unsigned is selected.