| vertex | 下一个顶点的值。 |
分配已分配顶点列表的下一个顶点的值。
用于通过重复调用此函数以迭代方式填充已分配顶点的值，直到提供所有值为止。这种填充顶点数据的方式与 SetAllVertices 互斥。
每次调用此函数后，下一个顶点的内部计数器都会自动递增。
当调用此方法时，无法使用 SetAllVertices 来填充分配的顶点数组。
注意，调用 SetNextVertex 的次数少于分配的顶点数将使其余顶点具有随机值，因为 MeshGenerationContext.Allocate 不将返回的数据初始化为 0 以避免冗余工作。
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