It means, I must calculate both min and max values from the center of the box ?
For example, if I have a regular figure 30 units in lenght (X axis), 20 in width (Y axis) and 10 in height (Z axis) then proper mins are -15.0 ; -10.0 ; -5.0 and maxs are 15.0 ; 10.0 ; 5.0?
edit: And what are the possibilities of displaying such entity ?