Optional ReadonlyadditiveWhen true on a layer after the first, the pose is added through
ValueAdapter.add. The first layer always replaces,
even if this is set. Default false (weighted lerp over the pose so far).
ReadonlycontrollerController that produces this layer's pose.
Optional ReadonlyweightBlend or add weight. Default 1. Finite; values outside [0, 1]
extrapolate the same way ValueAdapter.lerp does.
One layer of an AnimationLayerStack.