Mesh 面的拓扑。
通常网格由三角形(每个面三个顶点索引)组成,但是
在某些情况下,您可能要渲染由线条或点组成的复杂
内容。创建具有该拓扑的 Mesh 并使用它进行渲染通常是
最高效的方式。
另请参阅:Mesh.SetIndices 函数。
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