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3D Graphics with XNA Game Studio 4.0 by Sean James

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Skinned animation

The final type of animation we will look at is skinned animation. Skinned animation animates the individual vertices of an object based on the object's skeleton. Each bone is assigned a number of vertices, which it will affect when moved. For each of those vertices, each bone is also assigned a weight determining how much influence the bone will have on each vertex. This technique is especially useful for animating characters, animals, and so on, because it makes it easy to simulate a smooth, flowing, morphing skin with a skeleton inside. For example, it is easy to model an arm as being made up of a few bones, which will deform the skin when moved. This makes for a much more realistic effect than other approaches and makes animation ...

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