centers the children of an object with respect to the first child along selected dimensions.
In example below, there are three cylinders with varying heights and radiuses. Initially, they all meet at the origin (0,0,0).
When no axis was given (i.e.,
t="center"), centering is done in all dimensions.
When some axes are specified (i.e.,
t="center xy"), centering is done in those axes.
center xy centers the three
cylinders in x and y axes with respect to the first child, which
is the pink disk.