The easiest way to do this is to go to the Views menu and select Viewport Background.
简单的方法是进入视窗菜单，然后选择视窗背景。
The dimensions of the #header ID class are now in line with the iPhone viewport, and I manually changed the background image to fit in the space.
headerID类的尺寸现在符合iPhone视窗的大小，并且我手动更改了背景图片以适应空间大小。
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。
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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