One way is to find the geometric center of the object by computing the object bounding box by finding the maximum and minimum X, Y and Z values, then computing the mid-point of the bounding box.

先找到物体包围盒的中心，找到物体最大和最小的X， Y， Z坐标，两个坐标中点就是物体包围盒的中心。

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Minimum—Aligns the closest point of the object's bounding box with the chosen point on the other object.

这句话的意思是：以物体的边界盒最内侧点同另一物体的选择点对齐。

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