The easiest way to import a Gaea terrain into Unreal Engine is to use the gaea2unreal plugin.

If you wish to import it by yourself, use Unreal-node to prepare the output to fit your terrain size as required by Unreal Engine. Then you can manually import the terrain.

1. Enter Landscape mode.
2. Click Import from File.
3. Click the button next to Heightmap File and select your heightmap.
4. Calculate the Z scale for your heightmap using the formula (Max height of your heightmap in meters) x (100 to convert to centimeters) x 0.001953125.
5. Click Import.

You can follow the exact instructions on Unreal's official documentation:

https://dev.epicgames.com/documentation/en-us/unreal-engine/importing-and-exporting-landscape-heightmaps-in-unreal-engine

Unreal Node

The Unreal node is made to prepare your data to be imported into Unreal Engine very easily using the Gaea2Unreal bridge plugin. The Unreal node will resample the data to a Unreal friendly resolution (for example, a 2048 x 2048 build will become 2017 x 2017 to accommodate UE's considerations).

Adding Inputs

You can add multiple inputs to the Unreal node.

Target Size and Format

The node's Target Size property lets you select the resample size. It is recommended that you select your Gaea build resolution to be the closest to the size you need. Based on your current Build Resolution set in the Build Options, you will be given a recommended Target Size.

You can set the file format for all the exported files.

Unreal Friendly Naming

By default, the filename for each input is decided by the name of the node. You can rename a node to rename the output filename.

To use the Gaea2Unreal bridge, you should enable Unreal Friendly Naming. This will prefix T_ in front of masks and textures and H_ in front of the heightfield.

Building

When you build your terrain (See ..) the Unreal node will save all the appropriate asset files along with a JSON definition file. This is the key file you will need for Importing Terrains.

See the next section on how to set up your exported terrain in Unreal Engine.