Using the Settings above, the background of your perspective viewport will show the LDR environment map.

使用上图的设置，透视图中的背景将显示环境图片。

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To keep the viewport performance I deleted grass from the parts that would not be visible in the rendered perspective.

为了保持背景图效果，我删除了部分草地，这在渲染透视中是看不到的。

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The vertex positions are transformed from clip-space to window space via the Perspective Divide and the Viewport Transform.

经过视角除法和视口变换两步，顶点的位置就从裁剪空间变换到了窗口空间。

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