Left-Up-Forward Coordinate System in Unreal Editor for Fortnite

As of 36.00, UEFN uses the LUF coordinate system for the editor and all /Verse.org module transforms. /UnrealEngine.com and /Fortnite.com module transforms use the XYZ coordinate system.

Introducing the LUF Coordinate System

All major 3D content creation tools use a Cartesian coordinate system (X, Y, and Z) to position and rotate objects. However, the specific interpretations for which axes (X, Y, and Z) represent which directions (such as left/right, up/down, and front/back) are different between tools. In addition, the way rotations are modeled —known as the handedness of the coordinate system—also varies between different tools.

To better align Verse and UEFN with emerging standards in 3D content creation and other prominent toolsets, we're making fundamental changes to our coordinate system presentation.

First, instead of labeling coordinate axes with X, Y and Z, we're introducing more descriptive axis names:

• Left (was -Y)
• Up (was Z)
• Forward (was X)

The change from the previous XYZ and FRU to LUF therefore corresponds to a handedness change in the axes from a left-handed coordinate system (XYZ and FRU) to a right-handed coordinate system (LUF).