Sets the Composite Collider 2D to generate closed outlines for the merged collider geometry consisting of only edges.
The outline geometry is equivalent to using an EdgeCollider2D with the chains of edges all connected. While all the edges are closed (the end edge connects to the start edge), nothing will collide in the interior of such geometry as there is no overlap of the edges. A collision or trigger will be registered only if the edges are in contact with a collider.
这通常是可使用的最有效几何体，因为它生成的边缘要少得多。连续边缘不会导致不必要的碰撞，因为所有边缘都已连接。不必要的碰撞是两个分离的碰撞体接触的情况，即使它们完美对齐也是如此。使用这种类型的几何体可生成平台表面，其他碰撞体在这些表面上移动不会受到不必要碰撞的任何干扰。
围绕它的复合边缘导致的任何内部孔均不会导致任何内部重叠，而是形成新复合碰撞体形状的另一个封闭部分。
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