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Character Animation with Direct3D® by Carl Granberg

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Bone Hierarchies

When attempting to understand what a bone hierarchy is and how it works, it helps to think of your own skeleton. Bone hierarchies work fundamentally in exactly the same way. Think of one of your many limbs. For instance, look back at the arm in Figure 3.1. Consider the three major joints in that arm: the shoulder, elbow, and wrist joints. These three joints are connected with two bones: the upper and the lower arm. In a bone hierarchy, the upper arm is the parent of the lower arm. This means that whenever the upper arm is rotated around the shoulder joint, this transformation also affects the location of the lower arm and the hand (even though these haven’t been rotated in relationship to their parents). This is something quite ...

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