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In most cases, animation is not just the movement of a single object, but rather the movement of an entire linked chain or hierarchy of objects. For example, this robot arm. If I grab the Rotate tool and select one of these objects and turn it, you'll see that the other objects turn as well. We can rotate this object and you'll see that we've got a relationship between these. This is called an animation hierarchy or sometimes called linking or parenting.
Those all basically mean the same thing. There are three main principles around animation hierarchies. First of all, children inherit transforms of their parent. For example, if I select this turntable object and rotate it, then all of its children will rotate as well. Second, a child may have exactly one parent and no more, unlike in biology where a child has two parents. And finally, a parent may have multiple children.
For example, I've got this wrist object down here and it's got two children, these two claws, and if I manipulate this wrist by, let's say, for example, moving it, you'll see that those two claws move as well. Those are the basic principles of hierarchies. Children inherit transforms of their parent, a child may have exactly one parent, but a parent may have more than one child.
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