Memory Management in Unreal Editor

To help your islands run on all supported platforms, Fortnite has some memory limitations in place.

In Unreal Editor for Fortnite (UEFN), you can use expanded memory capabilities to make larger and more diverse experiences. To fully take advantage of this, it helps to understand the way that memory use is calculated in UEFN.

World Partition

World Partition is the magic behind building a large island experience. This feature automatically divides the world into a grid, and streams only the necessary cells.

World Partition uses Streaming, which loads and unloads cells, and Hierarchical Level of Detail (HLOD), that groups and decreases the amount of detail on assets as the player camera moves away.

For more information on World Partition, Streaming, and HLODs, see Streaming and HLODs.

How Memory Gets Calculated

UEFN calculates memory use from data produced at cook  time. This means: