Set here the translation applied to each layer linked
to a window or list of windows.
When linking a window to a layer, the translation is always
applied to the layer. The final position is obtained adding
this translation vector to all the layer objects.
By default this translation vector is
0.0,
0.0,
0.0, so no translation is applied.
When a list of windows is linked, each window will be linked to a new,
automatically created layer, with the same parameters of the proposed
layer, so new layer objects get the same positions as the objects in
the proposed layer.