实验性实验性Add实验性SubtractThe associated BlockVolume is considered a negative or void
space, and any intersection tests are considered misses.
Using the Subtract action, it is possible to punch holes
in block volumes so that any intersection tests may pass
through such spaces
相关的BlockVolume被视为一个负空间或空白空间，并且任何交集测试都被视为未命中。 使用Subtract操作，可以在方块体积中“打孔”，以便任何交集测试可以穿过此类空间。
The Action enum determines how the CompoundBlockVolume considers the associated CompoundBlockVolumeItem when performing inside/outside calculations.
Action枚举表示CompoundBlockVolume在进行内部/外部计算时如何考虑 相关的CompoundBlockVolumeItem。