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Another very cool way to modify the shape of an object is through the use of what's called a hook that acts just like a fishhook on something. So we can select, let's say these vertices here, and I have tabbed into Edit Mode, and I've selected these vertices, and if I come down, still in Edit Mode, under Mesh > Vertices > Add Hook, I now have two options. I can add a hook to what's called an empty or to another selected object. I'm going to go ahead and click on New Empty here, and empty is a special kind of object in Blender that's really just a point in space.
Now when I tab out of Edit Mode, I see that my sphere here has another modifier called a Hook Modifier to an Empty. The name of the object is here an Empty, and now as I grab and move the Empty, look what's happens to the surface of this sphere. It gets stretched out. So these vertices move along with this Empty. If I wanted to move it for a one-to- one relationship, I keep the Force at 1. Otherwise I can drag this down to like a 0.5.
Now for every 2 units that I move the Empty, the vertices deform by 0.5,and this is acting like a rubber band was super glued to the top of the sphere. So that's the way you can use hooks. So now I can just animate the location of this Empty and it will change the shape of the mesh.
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