| indices | 接收数组的列表。 |
获取广告牌网格的索引。
广告牌网格总是由三角形构成。为每个三角形指定每个顶点（在顶点数组中）的索引。第二个重载如果列表容量足够，保证不会进行内存分配。
其他资源：BillboardAsset、SetIndices。
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