> For the complete documentation index, see [llms.txt](https://docs.world-creator.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.world-creator.com/zh/cao-zuo-zhi-nan/tian-jia-dui-xiang/zhe-zhao-dui-xiang.md).
# 遮罩对象
目前，我们的灌木散布在整个地形上，这不是我们想要的。相反，我们要将它们限制在河流的两侧，在这种干燥地形上水自然会聚集的地方。为此，将河流图层拖入我们对象图层的分布中。这将创建一个 **河流分布** 自动链接到该图层。此外将 **河流范围** 设为0并将 **河谷范围** 设为1，因为我们不希望灌木出现在河流本身。
如你所见，这为河流周围提供了一个非常窄的遮罩。要改变这一点，我们将把 **河谷宽度** 设置为5，这样我们就有一个更大的河谷可以放置灌木。
除此之外，我们现在添加一个 **模糊** 效果以进一步平滑它，并为我们的灌木提供一个漂亮的宽广散布区域。
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