该盒体的最大 y 点。
Only points with a y component less than this value are contained in the box.
Sets the maximum value of BoundsInt's y point. If you enter a maximum value that is less than the current minimum value, then the entered value becomes the new minimum value and the previous minimum value becomes the new maximum value. The position and size of the BoundsInt is then adjusted based on the new minimum and maximum values.