A computer-implemented method of manipulating some portion of a 3D representation of a scene from a reference view direction using a touch-sensitive display unit that includes identifying, by the touch-sensitive display unit, the portion of the 3D representation of the scene to be translated; generating and displaying on some portion of a display device of the touch-sensitive display unit a second 3D representation of the scene from an auxiliary view direction that may be selectively adjustable; and using the second 3D representation of the scene to translate the portion of the 3D representation of the scene.