青云翻译

要改变顶点的可选索引。顶点索引顺时针从左上角的一个开始，在0-3的范围内。如果=- 1或省略，所有四个顶点将被改变。

Optional index of the vertex to be changed. Vertices are indexed clockwise starting from top-left one in the range 0-3. If =-1 or omitted, all four vertices will be changed.

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Optional index of the vertex to be changed. Vertices are indexed clockwise starting from top-left one in the range 0-3. If =-1 or omitted, all four vertices will be changed.