offset

Shifts generalizedProjection's viewportCenter in x/y, in the same world units as the viewport rectangle itself -- an off-axis (sheared) frustum shift, the way a lens-shift lens or a tiled/CAVE display's off-center screen would, without moving or rotating the eye. Vector2.ZERO is the ordinary on-axis frustum. Damped like the other orbit properties -- set it directly for an instant change, or animate it smoothly with offsetTo.