Start with default scene with a cube object.
用一个立方体物体从默认场景开始。
The tutorial seems to be using a default camera for the Raycast, make sure you have a camera in the scene that has its Tag set to Main camera.
本教程是使用默认的相机对光线投射，确保你的场景中的摄像机，其标签设置主相机。
NOTE: By default if you don't create any occlusion areas, occlusion culling will be applied to the whole scene.
注意：默认如果你没有创建遮挡区域，遮挡剔除将应用到整个场景。
Sometimes if we use a lot of bright ambient-only lights in a scene, the default shadows may look faded or pale.
当我们在场景中使用了很多个ambient - only光照时，默认的阴影看起来就显得苍白而虚假。
Sometimes if we use a lot of bright ambient-only lights in a scene, the default shadows may look faded or pale.
当我们在场景中使用了很多个ambient - only光照时，默认的阴影看起来就显得苍白而虚假。
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