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A 3D input device is also known as a 3D mouse, a 3D motion control device, or a spaceball. You use the puck or ball on a 3D device to control motion.
Using a 3D input device, you can:
Rotate the model at any time without selecting the Rotate command or pressing any mouse buttons.
Rotate the model with one hand while you use the mouse in your other hand to select objects.
Rotate, pan, and zoom at the same time in one fluid motion.
Rotate, pan, and zoom in one direction.