你还可以创建一个环境光源以产生无方向性的光，或者点光源，如果你想对你场景中的特定区域聚焦。

You can also create an AmbientLight which will produce a directionless light, or a SpotLight if you want to focus on a particular part of your scene.

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所以，让我们创建三个光源，并将它们放到空间中的一点。

So, let's create 3 sources of light putting them in one spot of space.

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