If you want to have many shadow casting lights, you need to use Deferred Lighting rendering path.

如果你想有多个的阴影投射灯，你需要使用延迟光照渲染路径。

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By contrast an Nvidia graphics processing unit, or GPU, renders graphics by simultaneously hashing out the same problem for multiple pixels: textures, lighting and smooth rendering of shapes flying across the screen.

FORBES: Shoot To Kill

The Unreal Development Kit for Apple devices will include tools for advanced 3-D rendering, lighting, animation and other effects.

FORBES: Hit Game Engine Launches On iPhone Thursday, Android Later