void RotateTowards(Transform targetTransform)
{
int index = Arranger.GetEmptyLinkIndex();
Transform linkTransform = Arranger.LinkPositions[index];
Vector3 targetDir = targetTransform.position - transform.position;
Vector3 toDir = linkTransform.position - transform.position;
float angle = Vector3.SignedAngle(targetDir, toDir, Vector3.up);
this.transform.Rotate(Vector3.up, angle);
Arranger.SetLinkAtIndex(index, targetTransform);
}