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Virtually every 3D app or game will need to support mouse or touch interaction with the 3D scene. Consider a real-time strategy game like StarCraft where clicking on units is essential to the gameplay. Check out the Stage3D API and you’ll quickly realize that there’s zero functionality to handling mouse or touch events. So how do all of these games handle it? The answer is a technique called “picking” and this article will show you how to implement it.

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