| submesh | 子网格索引。请参阅 subMeshCount。 |
uint 应用于此子网格的所有顶点索引的偏移。
获取给定 sub-mesh 的基顶点索引。
在使用 16 位索引缓冲区时，基顶点可以用于实现大于 65535 个顶点的网格，
只要每个子网格都适应其自己的 65535 顶点区域即可。或者，可以通过 indexFormat 使用 32 位索引缓冲区。
另请参阅：SetIndices。
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