Mesh 面片的拓扑结构。
通常，网格由三角形组成（每个面三个顶点索引），但在某些情况下，您可能希望渲染由线或点组成的复杂对象。使用这种拓扑结构创建 Mesh 并使用它进行渲染通常是最有效的方式。
其他资源：Mesh.SetIndices 函数。
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