当你使用多个相机时，每一个都将自己的颜色和深度信息存储在缓冲区中，还将积累大量的每个相机的渲染数据。
When you are using multiple Cameras, each one stores its own color and depth information in buffers, accumulating more data as each Camera renders.
每个相机在渲染时会存储颜色和深度信息。
Each Camera stores color and depth information when it renders its view.
在相机完成场景的渲染后被调用。
OnPostRender: Called after a camera finishes rendering the scene.
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