Why do Quaternions have four variables?
问题 The official documentation for the Unity Engine doesn't contain this, and I'm not far enough into my math/physics studies to have come across a Quaternion, but I understand it has to do with rotation. What I don't understand is why Quaternions have four variables, w,x,y,z, when there are only three axis of rotation in Unity. 回答1: "A quaternion is basically an axis in 3D space with a angle of rotation around the axis. Four values make up a quaternion, namely x, y, z and w. Three of the values