为了让几何拣选可以工作，你还需要为你场景中的对象设置多项能力。

For geometry picking to work you need to set various capabilities on the objects in your scene.

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首先，人们可以提出一个新的设置，其中的几何不确定性减少。

First, one can suggest a new set-up in which the geometrical uncertainty is reduced.

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在对环路设置效果进行评价时，试图建立环路几何长度与其服务效果的联系。

When set up the result and appraise to the ring road, attempt to establish the length of ring road geometry instead of the connection of serving the result.

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