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Chapter 15. Keyframe Animation: One Step... > The Fundamentals of Hierarchical Lin...

The Fundamentals of Hierarchical Linking

Two of the objects in your scene are animated, the dummy and the airplane's propeller. However, what you actually want to have happen is for all of the objects to move forward and rotate 90 degrees as if the airplane were taxiing for takeoff, all the while having the propeller rotate as if pulling the plane along.

The dummy object in the scene will handle all of the forward motion and rotation of the airplane and propeller, but at this point the three objects have no awareness of each other. You'll learn to use hierarchical linking to solve this problem. Again, hierarchical linking is a parent-child relationship between objects that is created by clicking the Select and Link button on the main toolbar, clicking on the child object, and dragging it to the parent object. As you drag, you'll see a rubber-band line stretching from the pivot point of the child object to your cursor. When the cursor is on the intended parent and you release the mouse button, the object will flash white briefly to indicate that the link has been successfully created.


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