FVector PlaneConstraintNormal
The normal or axis of the plane that constrains movement, if bConstrainToPlane is enabled. If for example you wanted to constrain movement to the X-Z plane (so that Y cannot change), the normal would be set to X=0 Y=1 Z=0. This is recalculated whenever PlaneConstraintAxisSetting changes. It is normalized once the component is registered with the game world.
[bConstrainToPlane](API\Runtime\Engine\GameFramework\UMovementComponent\bConstrainToPlane)