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http://docs.unity3d.com/460/Documentation/Manual/SL-BuiltinValues.html
http://docs.unity3d.com/Manual/SL-BuiltinMacros.html
http://docs.unity3d.com/Manual/SL-DepthTextures.html
http://docs.unity3d.com/Manual/SL-CameraDepthTexture.html
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原文地址：http://www.cnblogs.com/lilei9110/p/4569094.html
