Rotate Root Bone
Rotate the root of the skeleton
GraphNode:
UAnimGraphNode_RotateRootBone
AnimNode:
FAnimNode_RotateRootBone
Rotates the joint at the root of the skeletal hierarchy by the specified pitch and roll.
Each of the two has an associated scale-bias-clamp attribute, to map the value from one range to another, clamp, interpolate, and scale the result, and apply a bias, like with a lot of alpha attributes as well.
Additionally, a mesh to component
rotator is exposed. This is a rotator that will get combined with the rotation resulting from pitch and yaw. While undocumented in code, this is presumably intended to compensate for potential space offsets that could be caused by a root bone that is rotated in the rest pose.
The node is also able to apply the rotation to the root motion, rotating the direction of motion.