Unreal Engine uses a “left-handed” coordinate system while SPICE uses a “right hand” one.
2D to Left-Handed 3D Coordinate Systems
The SPICE Y and Z axes are exactly the same as Unreal Engine. But, in Unreal Engine the X axis is the Left hand version (“in”/“forwards”), and in SPICE land it’s the Right Hand version (“out”/“back”).
Moving data out of SPICE into Unreal Engine
Spatial data must use SPICE/UE conversions as pictured above to exchange spation data between SPICE and Unreal Engine. Conversions in both directions are provided for SDimensionlessVector, SVelocityVector, SDistanceVector, and SQuaternion. Each conversion ensures the coordinate system conversions are correct.
