1.animator viewのlyaerでＩＫＰａｓｓにチェック
2.scriptで
void Start()
{
anim = GetComponent<Animator>();
}
  anim.SetLookAtWeight(1.0f,0.3f,0.8f,1.0f,0.5f);

anim.SetLookAtPosition(Vector3 lookAtPosition); }