【效果预览】

教程知识点：
让物体在另一个物体表面运动
时间线动画
用xretime来制作定格动画
解决处理问题的优先性
Learn a way to animate an object moving across the surface of another object (0:42)
Learn several ways how to retime an animation thru the use of time tracks (6:50)
Use xretime to create stop motion animations/ posterize time like After Effects (11:00)
Troubleshoot priority issues & order of operations (11:55)
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