게임에서 내적과 외적(Dot Product and Cross Product in Game)

https://docs.unity3d.com/kr/current/Manual/UnderstandingVectorArithmetic.html

https://bit.ly/2Y1m7cq

http://lab.gamecodi.com/board/zboard.php?id=GAMECODILAB_Lecture_series&no=126&z=

https://mrw0119.tistory.com/12

http://rapapa.net/?p=2974