[程式] 在3D空間中如果判斷誰在左邊誰在右邊
如題，我想在一個3D遊戲中檢查敵人在我左邊還是右邊
，但是我卻不知道要用什麼做依據來算。
我現在只知道用角色的正面向量跟與敵人的向量求出內積
，但是確不知道這個內積的值是正的還是負的，因此就不
知道是左邊還是右邊了。
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