| vertexCount | 要分配的顶点数。最大值为 65535（或 UInt16.MaxValue）。 |
| indexCount | 要分配的三角形列表索引数。每 3 个索引代表一个三角形，因此此值应为 3 的倍数。 |
| vertices | 返回的顶点。 |
| indices | 返回的索引。 |
从临时分配器中分配指定数量的顶点和索引。
您只能在面板的网格生成阶段调用此方法，并且不应该在超出此阶段后使用它。
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