Capturing facial expressions and using them to drive the expression of a virtual character is more difficult than motion capture, because the movements involved are much smaller and more subtle.

捕捉面部表情，并用这些表情来操纵虚拟角色的表情，比捕捉肢体动作困难得多，因为它涉及的动作微小得多，也更加难以捉摸。

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Once the motion-capture data has been obtained, it can be used to drive the movements of a virtual character, which may be a very different size and shape from the original actor.

动作捕捉数据一旦被捕获，便可以用以使虚拟角色做出相应动作，而虚拟角色的大小和外形可能跟表演者大相径庭。

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In part one we discussed how motion tracking lets us be awesome air guitarists and drummers inside the virtual space.

在第一部分，我们讨论了运动跟踪怎么让我们敬畏虚拟空间的空气吉他手和鼓手。

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Like a motion-controlled video gaming system, the Virtual Music Instrument employs a camera that is mounted on a computer screen and aimed at someone, capturing their gestures.

CNN: One-handed violinist helps the disabled make music

That lets the Meta 1 track your gestures, individual fingers and walls or other physical surfaces, all of which are processed in the PC with motion tracking tech to give the illusion of virtual objects anchored to the real world.

ENGADGET

Many schools have integrated Organic Motion's system into their gaming, animation, virtual reality, computer science, and life science classes.

ENGADGET: Organic Motion's OpenStage motion capture system grabs 200FPS, no backdrop required (video)