本文解释了3D旋转中的Gimbal Lock问题，并介绍了两种计算旋转的方法：欧拉角(Euler)和四元数(Quaternion)。通过对比这两种方法，帮助读者理解在3D建模和动画中如何避免Gimbal Lock现象。
The video explains the rotation problem in 3D, Gimbal Lock. There are two ways of computing the rotation: Euler and Quaternion.
Keywords: Euler, Quaternion, Gimbal, World/Local Coords
The video: http://guerrillacg.org/home/3d-rigging/the-rotation-problem
Also, I found this site is really useful. It has many 3D tutorial videos.
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