| positions | 要设置的位置的数组。 |
设置轨迹中所有顶点的位置。
只能使用此方法修改轨迹中的现有位置。不能将其用于添加新位置。
在设置所有位置时，请使用此方法代替 SetPosition，因为使用单个命令设置所有位置比单独设置每个位置更高效。
另请参阅：positionCount 属性。
另请参阅：SetPosition 函数。
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