unity模仿mc放方块

private void Update(){
	if (Input.GetMouseButtonUp(0)){
		Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		RaycastHit hit;
		if (Physics.Raycast(ray, out hit) && (hit.transform.tag.Equals("box"))){
			Transform hitted = hit.transform;

			GameObject temp = newGOByPath(BOX_PATH);
			temp.transform.position = hitted.position;
			BoxCollider collider = temp.GetComponent<BoxCollider>();
			float realSize = collider.size.x / 2;

			Vector3 c2p = hit.point - hit.transform.position;
			float toRD = smallDegree(Vector3.Angle(c2p, Vector3.right));
			float toFD = smallDegree(Vector3.Angle(c2p, Vector3.forward));
			float toUD = smallDegree(Vector3.Angle(c2p, Vector3.up));

			if (toRD <= 45){
				temp.transform.Translate(realSize * Vector3.right);
				Instantiate(temp);
			} else if (toFD <= 45){
				temp.transform.Translate(realSize * Vector3.back);
				Instantiate(temp);
			}
			else if (toUD <= 45){
				temp.transform.Translate(realSize * Vector3.up);
				Instantiate(temp);
			} else{}
		}
	}
}