А node that dynamically copies the 3D transform of a bone in its parent [Skeleton3D]. This node selects a bone in a [Skeleton3D] and attaches to it. This means that the [ModifierBoneTarget3D] node will dynamically copy the 3D transform of the selected bone. The functionality is similar to [BoneAttachment3D], but this node adopts the [SkeletonModifier3D] cycle and is intended to be used as another [SkeletonModifier3D]'s target. The index of the attached bone. The name of the attached bone.