Bounds.size 大小
var size : Vector3
Description描述
The total size of the box. This is always twice as large as the extents.
包围和的总大小。这个总是extents的两倍大。
size.x is the width, size.y is the height and size.z is the depth of the box.
边界框的size.x是宽，size.y是高，size.z是深。
